Consulta: subjectFacets:"Size distribution"
Registros recuperados: 52
Data/hora: 06/06/2024 19:08:31

Mesure de la retention de Skeletonema costatum par Ruditapes philippinarum (Mollusque, Bivalve) en fonction de la longueur des colonies algales: Principes methodologiques
Provedor de dados: 5
Autores: Sauriau, P; Baud, Jean-pierre.
Based on Coulter Counter data, a new method is proposed to study the influence of the polymorphous variability in size as well as in shape of the diatom species Skeletonema costatum on the physiological performances of the Manila clam Ruditapes philippinarum . Three conditions are required in order to convert volumetric data determined with the Coulter Counter into metric data, i.e. (1) stability of the pervalvar diameter of the diatom chains, (2) statistical independence between length and pervalvar diameter of the diatom chains, and (3) negligible level of coincident passages through the aperture orifice. Under these three conditions, the mean length (l) of a S. costatum chain can be related to the mean pervalvar diameter (d) of diatom chains and to the...
Tipo: Text
Palavras-chave: Bivalvia; Skeletonema costatum; Bacillariophyceae; Algae; Physiology; Biopolymorphism; Counters; Size; Size distribution; Feeding; Nutrition.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1670.pdf

Survie des langoustines (Nephrops norvegicus ) s'echappant d'un cul de chalut
Provedor de dados: 5
Autores: Morizur, Yvon; Charuau, Anatole; Rivoalen, Jean-jacques.
The survival rate of Nephrops escaping through the cod-end was recently studied in the Bay of Biscay. Over the 45mm meshed cod-end was put a 15mm meshed net in order to retain the Nephrops escaping though, the cod-end. Soon after hauling escaped Nephrops were returned on the sea-bed into cages. After an inversion of 60-78 hours, the average survived rate was about 70 %. However it was found increasing with the size of individuals. The value obtained, which is only a result of- the action oh several factors, may be lower than the true value. I he evolution, of this biological parameter according to the mesh size is discussed in the scope of assessments
Tipo: Text
Palavras-chave: Size distribution; Crustacean fisheries; Mesh selectivity; Trawling; Fishing mortality; Survival.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2339.pdf

Biometrie et Croissance des Jeunes Crevettes Trachypenaeus de la Guadeloupe (Antilles Francaises).
Provedor de dados: 5
The principal biometric relations of juvenile Trachypenaeus similis similis and T. constrictus in Guadeloupe were calculated from 1976 to 1978. The examination of these relations yields few differences between the two species. A growth curve was established according to the sequences of modal values; these were determined according to weekly size frequency distributions over three different periods of time. In the zone studied, the growth of young Trachypenaeus is more rapid than that of the young Penaeus.
Tipo: Text
Palavras-chave: Trachypenaeus; Juveniles; Size distribution; Growth curves; Biometrics.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-1932.pdf

Etude de l'impact des icebergs Antarctiques sur l'Océan Austral
Provedor de dados: 5
Autores: Bouhier, Nicolas.
The Antarctic polar ice cap constrains a freshwater flaux into the Austral Ocean through two equally important pathways : a localized and immediate injection through the melting of ice-shelves bases, and a delayed offshore injection through the calving and subsequent melt of icebergs. Some studies reckon that melting icebergs have the capacity to alter the hydrological and biogeo-chemical characteristics of the water column. The numerical models trying to evaluate this impact have shown contrasting results. Yet, they might suffer from a poor representation of the icebergs, namely due to our limited knowledge on both the spatial and size distributions of the icebergs, or even the processes involved in their mass loss. A new method using satellite altimetry...
Tipo: Text
Palavras-chave: Ntarctique; Calotte polaire; Plate-forme glaciaire; Océan austral; Flux d’eau douce; Télédétection; Banquise; Fonte; Fracturation; Distribution de taille; Antarctica; Ice cap; Ice shelf; Southern Ocean; Iceberg; Freshwater flux; Remote sensing; Sea ice; Melting; Fragmentation; Fracturing; Size distribution.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00497/60905/64253.pdf

Comparaison de methodes de decomposition de distribution polymodales de frequences de longueurs en distributions unimodales successives (NORMSEP-MIX-Maximums successive maximums), application aux "bossus" (Pseudolithus elongatus ) du Congo
Provedor de dados: 5
Autores: Le Guen, J.c; Morizur, Yvon.
Length measurements on Pseudotolithus elongatus ' samples from the Congo were recorded in the 60s. Subsamples were collected in order to be "aged" by otoliths' reading. The size frequency distributions were splitted into successive unimodal distributions by different methods. Their results were compared. The results obtained from the "successive maximums' method" were similar to those from the "otoliths' reading." The programs NORMSEP and MIX gave results far more difficult to interpret biologically speaking in spite of their mathematical quality. Because many length frequency distributions of a cohort are symmetrical in nature, we suggest applying the "successive maximums' method"if there is no evidence of normality
Tipo: Text
Palavras-chave: Frequency analysis; Size distribution; Pseudotolithus elongatus; Sciaenidae; Pisces.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/rapport-2336.pdf

Aérosols côtiers dans le nord de la Manche
Provedor de dados: 5
Autores: Flament, P; Lepretre, A; Noel, S; Auger, Y.
Dix-huit prélèvements d'aérosols ont été effectués en Manche Nord, soit en bordure de mer, soit à quelques milles au large, à l'aide d'un impacteur à cascade (5 étages). L'ensemble des données (concentrations de 8 éléments répartis en 6 classes granulométriques successives) est exploité par analyse factorielle des correspondances. Celle-ci permet de mettre en évidence de larges déformations dans les spectres granulométriques pour les éléments traceurs marin et terrestre (Na et Al). En opposition, les métaux résultant d'activité anthropique (Fe, Pb, Zn, Mn), ont des comportements beaucoup plus typés. Parmi ceux-ci, la présence du manganèse sur le site paraît être indépendante de celle des autres métaux et imputable à une seule source. Pb, Fe, Zn et cuivre...
Tipo: Text
Palavras-chave: Aérosols; Éléments-traces; Analyse par correspondance; Distribution granulométrique; Littoral; Aerosols; Trace elements; Correspondence analysis; Size distribution; Coastal.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00110/22082/19723.pdf

Distribución de los morfotipos gregaria y subrugosa de la langostilla Munida gregaria (Decapoda, Galatheidae) en el golfo San jorge en la campaña de verano AE-01/2011. Integración de resultados con las campañas 2009 y 2010
Provedor de dados: 20
Autores: De la Garza González, J.L.; Ravalli, C.; López Greco, L.
The objective of this work is to increase knowledge on the distribution and punctual density of both morphotypes of Munida gregaria in the San Jorge Gulf, Argentina. The data derived from the research cruise carried out on board of the FV Álvarez Entrena I in February 2011. Specimens of gregaria and subrugosa were caught in 37 and 73 of the 91 trawls performed, respectively. Out of the total of positive trawls, 17 were performed at depths lower than 55 m and the remaining 60 at deeper waters. The relative average abundance of both morphotypes increased significantly with regard to the two previous years (2009, 2010). M. gregaria subrugosa represented 66.4% and gregaria the remaining percentage. In the south sector of the gulf, where the highest punctual...
Tipo: Journal Contribution
Palavras-chave: Biogeography; Abundance; Size distribution; Fishery surveys.
Ano: 2013
URL: http://hdl.handle.net/1834/5487

Distribución y estructura de tallas de la palometa (parona signata, carangidae) y el pampanito (stromateus brasiliensis, stromateidae) en relación con las condiciones oceanográficas en la Zona Común de Pesca (34° s-38° s) y estimación de la longitud de primera madurez sexual. Julio de 2001
Provedor de dados: 20
Autores: Perrotta, R.G.; Guerrero, R.A.; Carozza, C.R.; Quiroga, P.; Macchi, G.J.
Samples were obtained using bottom trawl nets during a coastal research cruise carried out on board of the RFV “Dr. E. L. Holmberg” between 3rd. and 16th. July 2001. The spatial distribution of surface and bottom temperature and salinity fields was analyzed at the oceanographic stations sampled in each trawl position. The analysis allowed to characterize the oceanographic conditions of the area during the sampling period and to compare them to the historic seasonal mean. 669 leatherjack specimens of 9-55 cm total length (TL) caught at depths ranging 5-29 m and 1,372 butterfish individuals of 6-40 cm total length (TL) caught at depths ranging 4-29 m were sampled. Length at first sexual maturity for both sexes was also estimated. Results were: leatherjack:...
Tipo: Journal Contribution
Palavras-chave: Marine fish; Environmental conditions; Size distribution; Coastal fisheries; Environmental conditions; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 2006
URL: http://hdl.handle.net/1834/1567

Informe sobre el muestreo de desembarque de anchoíta (Engraulis anchoita) y caballa (Scomber japonicus) en el puerto de Mar del Plata: período septiembre 1999-enero 2000, con algunos comentarios sobre el manejo de estos recursos.
Provedor de dados: 20
Autores: Garciarena, A.D.; Perrotta, R.G.; López, F.
The chub mackerel Scomber japonicus and anchovy Engraulis anchoita commercial landings at the Mar del Plata (Buenos Aires prov., Argentina) seaport during the September 1999-January 2000 period are studied. A total of 14 chub mackerel samples were taken for total length measurements exclusively and 5 anchovy sub-samples and 1 chub mackerel sub-sample were analyzed to record individual data total length, weight, sex, sexual stage, age from otoliths readings . Most of the fish caught for both species were adults and only a small fraction of chub mackerel juveniles was found in December 1999. Length-at-fifty-percent-maturity was calculated, length-weight and length-age relationships were fitted and length growth parameters estimated. Sea surface temperature...
Tipo: Journal Contribution
Palavras-chave: Commercial fishing; Population structure; Catch/effort; Size distribution; Mackerel fisheries; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2002
URL: http://hdl.handle.net/1834/2545

Estudio de la interrelaciones tróficas de dos elasmobranquios del Mar Argentino, en relación con las variaciones espacio-temporales y ambientales. Squalus acanthias (Squalidae) y Raja flavirostris (=Dipturus chilensis) (Rajidae).
Provedor de dados: 20
Autores: Garcia de la Rosa, S.B.
As a general rule, sharks and rays play an important role in the energy exchanges among higher trophic levels of the marine food chain and some of them, with an important impact as piscivorous predators.  Squalus acanthias (Squalidae) and  Raja flavirostris (=Dipturus chilensis )(Rajidae), are two elasmobranchs with high apparition frequencies in the SW Atlantic, in the coastal and demersal fishing trawls, co-existing and predating on the principal stocks of bony fish there located, especially the Argentine hake (Merluccius hubbsi). Both species could be transformed into alternative fishing resources, even though they are not currently commercially developed as such. The knowledge on their biology, given in great detail, will provide information for a...
Tipo: Theses and Dissertations
Palavras-chave: Geographical distribution; Abundance; Size distribution; Feeding behaviour; Diets; Interspecific relationships; Predation; Food preferences; Shark fisheries; Geographical distribution; Feeding behaviour; Predation; Food preferences; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_6162; Http://aims.fao.org/aos/agrovoc/c_3024.
Ano: 1998
URL: http://hdl.handle.net/1834/1487

Vieira patagonica (Zygochlamys patagonica King &amp; Broderip, 1832): una nueva pesquería en la plataforma continental argentina.
Provedor de dados: 20
Autores: Lasta, M.L.; Bremec, C.
Patagonian scallop (Zygochlamys patagonica King Broderip, 1832): A new fishery in the Argentine continental shelf. We present preliminary information on a new fishery of patagonian scallop (Zygochlamys patagonica King Broderip, 1832) in the Argentine Continental Shelf. A research program was conducted jointly by INIDEP and a fishing company during 1995 with the F/V Erin Bruce. The vessel, fishing equipment and processing on board are described. A total of 7235 fishing tows were performed during 246 days at sea. Seven new beds were located between 38º 50' S and 42º 30' S, along the 100-m isobath. Beds are discrete. Differences in the size structure by bed suggest that recruitment consists of sporadic pulses. Proportion of scallops and invertebrate by-catch...
Tipo: Journal Contribution
Palavras-chave: Scallop fisheries; Commercial fishing; Catch/effort; Fishing grounds; Size distribution; Potential resources; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1999
URL: http://hdl.handle.net/1834/1872

Diferencias entre parámetros vitales de las poblaciones bonaerense y patagónica de anchoíta argentina.
Provedor de dados: 20
Autores: Hansen, J.E.
Two pelagic cruises were carried out by R/V"Cap.Oca Balda" in the spring of 1988 and the following summer. Anchovy samples were taken in order to increase the knowledge on the differences between two main stocks of the species, inhabiting the Argentine Sea from 35°S southwards, with distributional boundary situated at about 41°S. Length-weight relationships were statistically different among populations. Weight-at-length values calculated for the summer cruise were higher tha sprin estimates, and they were also higher within Northern individuals. The differences were not statistically significant between stocks, but there are reasons to believe that if ages 1 and 6 of both stocks had been represented those differences would have been increased. Mortality...
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Growth; Mortality; Size distribution; Growth; Mortality; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1994
URL: http://hdl.handle.net/1834/1933

Distribución, áreas de concentración y estructura de la población del bacalao austral (Salilota australis, Gunther 1887)del Atlántico Sudoccidental
Provedor de dados: 20
Autores: Perez Comas, J.A.
The "bacalao austral" is a typical fish from the cold water of the Southwest Atlantic and the Southeastern Pacific oceans, whose fishery has not yet developed. In this work, the structure of the concentration areas of summer and winter distribution and other biological items were analyzed, basing on data provening from R/V"Walther Herwig" and R/V"Shinkai Maru", which operated in these waters during 1978/79/. The trophic vertical migrations are common in this species.
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Size distribution; Sexual maturity; Feeding; Food chains; Length-weight relationships; Population density; Ecological distribution; Vertical migrations; Cod fisheries; Geographical distribution; Feeding; Food chains; Sexual maturity; Population density; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_3014; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 1980
URL: http://hdl.handle.net/1834/2060

Abundancia relativa y distribución de tallas de corvina rubia Micropogonias furnieri y pescadilla de red Cynoscion striatus en la Zona Comun de Pesca Argentino-Uruguaya y en el Rincón. Noviembre, 1994.
Provedor de dados: 20
Autores: Carozza, C.R.; Cotrina, C.P.
The study aims to discriminate juvenile and adult concentration areas of white croacker Micropogonias furnieri and striped weakfish Cynoscion striatus in two different areas: Argentine-Uruguayan Common Fishing Zone (AUCFZ) and El Rincón (Buenos Aires Prov., Argentina). The length structure and the relative abundance of these two species were analyzed with data from a research cruise carried out by R/V Dr.E.L.Holmberg during November 1994. Data of relative abundance in t/nm2 were considered to define distribution and concentration areas. 49 samples of white croaker and 41 striped weakfish from AUCFZ a, inside the area of Río de la Plata and in front of Montevideo coast, at depths lesser than 8 meters, while the adults were located in the northern coast of...
Tipo: Journal Contribution
Palavras-chave: Abundance; Fishery surveys; Size distribution; Coastal fisheries; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 1998
URL: http://hdl.handle.net/1834/2472

Estructura poblacional de Porites astreoides, Agaricia agaricites y  Acropora palmata (Cnidaria: Scleractinia) en crestas arrecifales de la  región noroccidental de Cuba
Provedor de dados: 20
Autores: Perera-Pérez, O.; González-Díaz, S.P.; Álvarez Fernández, S.; González-Sanson, G.
La investigación se llevó a cabo entre abril del 2006 y mayo  del 2007. El objetivo fue determinar la estructura de las  poblaciones de Porites astreoides, Agaricia agaricites y Acropora palmata en crestas de arrecifes de la región noroccidental de  Cuba. Los indicadores ecológicos seleccionados fueron: talla media (diámetro mayor y altura), composición por clases de  tallas y parámetros de la distribución de frecuencias de tallas (moda, asimetría, curtosis, desviación estándar y coeficiente de  variación). Los valores medios de  diámetro y altura estimados para  P. astreoides en el arrecife de Los Colorados fueron  superiores (11,2 ± 0,3 cm y 6,7 ± 0,2 cm, respectivamente) a los obtenidos en Playa Baracoa y Rincón de Guanabo, mientras  que los de  A....
Tipo: Journal Contribution
Palavras-chave: Reefs; Size distribution; Human impact; Recruitment.
Ano: 2012
URL: http://hdl.handle.net/1834/4545

Estimaciones de la biomasa de merluza (Merluccius hubbsi) en los sectores argentino y uruguayo de la Zona Común de pesca argentino-uruguaya (34º 00º S-39º 30º S) Y en el área que se extiende hasta 41º S (ZEE Argentina) en 1994, 1996-2001 y 2003
Provedor de dados: 20
Autores: Bezzi, S.I.; Ibáñez, P.M.
Hake (Merluccius hubbsi) biomass in the Argentine and Uruguayan sectors of the Argentine-Uruguayan Common Fishing Zone (AUCFZ) and in the area that extends from the limit of the shared zone to 41° S was estimated (SW Atlantic Ocean). The contribution to the strata total biomass in each sector was analyzed and complemented with observations on the structure of the population. The basic data to estimate biomass derived from the evaluation surveys of the Hake Project carried out in winter or spring 1994, 1996-2001 and 2003. In 1999 biomass north of 41° S decreased to 30.  (112,280 t) of the estimates made for 1994. In 2000 it increased to 165,000 t and in 2003 it was estimated at 156,407 t. A remarkable decrease of the AUCFZ percentage of contribution to the...
Tipo: Journal Contribution
Palavras-chave: Size distribution; Biomass; Population structure; Exclusive economic zone; Biomass; Population structure; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2009
URL: http://hdl.handle.net/1834/3463

Variación de la talla de Eunicea flexuosa y Plexaura kuekenthali (Cnidaria: Octocorallia) en arrecifes coralinos cercanos a fuentes contaminantes en La Habana, Cuba
Provedor de dados: 20
Autores: Rey-Villiers, N.; Alcolado, P. M.
Se determinó la variación de la talla de los octocorales Eunicea flexuosa y Plexaura kuekenthali en arrecifes coralinos con diferente grado de contaminación urbana en la ciudad de La Habana, Cuba. Se midió la altura de las colonias encontradas a lo largo de un transepto de banda (100 x 1 m). La distribución por tallas de ambas especies mostró una tendencia a que las colonias alcancen una mayor frecuencia relativa en los menores intervalos de tallas en los sitios cercanos a las cuencas fluviales con mayor carga contaminante (medido por el número de fuentes contaminantes y carga dispuesta, DBO). La talla media de E. flexuosa fue significativamente menor en los dos sitios cercanos a las cuencas con mayor carga contaminante. Sus mayores tamaños de efecto...
Tipo: Journal Contribution
Palavras-chave: Environmental pollution; Size distribution; Coral; Gorgoniidae; Environmental pollution; Size.
Ano: 2012
URL: http://hdl.handle.net/1834/4590

Distribución estacional y estructura de tallas del abadejo Genypterus blacodes en el Mar Argentino
Provedor de dados: 20
Autores: Villarino, M.F.
The main purpose of this paper is to describe the seasonal distribution and length structure of the Pink cuskeel Genypterus blacodes. Data from surveys carried out between 1973-1989 were used. Basic data included Pink cuskeel densities per haul, catch length structure, depth and haul position. Pink cuskeel distribution was obtained by using the same density ranges for all seasons. A cluster analysis was applied to group the individual length structure of each survey catch. All year long the principal concentrations were within 40° and 48°S. Throughout the year the adults and juveniles were present in San Jorge Gulf, Patagonia, Argentina, so bimodal distribution were obtained. In winter juveniles were located within the sector 37° and 41°S. During autumn,...
Tipo: Journal Contribution
Palavras-chave: Size distribution; Geographical distribution; Fishery surveys.
Ano: 1998
URL: http://hdl.handle.net/1834/5787

Aspectos biológico-pesqueros del abadejo (Genypterus blacodes)
Provedor de dados: 20
Autores: Renzi, M.A.
The kingklip is one of the species that has been traditionally exploited in the Argentine Sea. Although captures were not very important, they have been increased in the last years. In this paper, the structure of the concentration areas of summer, spring and winter distribution and other biological aspects were analyzed, on the basis of the data collected during cruises carried out by R/V"Walther Herwig" and R/V"Shinkai Maru" in Argentine waters during 1978/79. The trophic spectrum of the kingklip comprises mainly food species of the Classes Pisces and Crustacea as well as other complementary groups like Mollusca, Brachiopoda and haliacea.
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Population structure; Size distribution; Feeding; Length-weight relationships; Food chains; Trophic relationships; Geographical distribution; Population structure; Feeding; Food chains; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_3014.
Ano: 1986
URL: http://hdl.handle.net/1834/2027

Distribución y estructura poblacional de la polaca (Micromesistius australis)
Provedor de dados: 20
Autores: Perrotta, R.G.
The polaca (Micromesistius australis)is a typical fish from the cold Malvinas current (temperatures between 3° and 10°C). The species is found in depths between 90 and 800 m and in latitudes from 37°40' to 50° S during winter and spring and from 42°S to 55°S during summer time, over the patagonian shelf and Burdwood Bank. One part of the stock reaches the southern region of the Scotia Sea, the western South Georgias and eastern South Shetland Islands. The dominant food species are Euphausia spp. The polaca is mainly a carcinophagous fish and may be found in a 3-4 trophic level, being one of the main food sources for primary and secondary ichthyophagous fishes.
Tipo: Journal Contribution
Palavras-chave: Size distribution; Spawning grounds; Feeding; Fish species; Feeding; Spawning grounds; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_7277.
Ano: 1982
URL: http://hdl.handle.net/1834/2049

Reconstrucción de la distribución de tallas de abadejo (Genypterus blacodes) a partir de una distribución de longitudes de cabeza.
Provedor de dados: 20
Autores: Villarino, M.F.; Aubone, A.
The total length distribution of pink cuskeel Genypterus blacodes catches is difficult to obtain. On the contrary, it is easy to have access to the head length distribution. So, the purpose of this study was to obtain a relationship between a certain head measurement and total length to estimate the length distribution of the catches. Individuals were obtained from bottom-trawl surveys between 39°-47°S and the San Jorge Gulf of the Argentine sea. Sets of measurements of total length (LT), maxillar length (Lmax), head length (Lc),orbital length (Lo), preorbital length (Lpo) and head length-total length ratio (r=Lc/LT) by sex were obtained. The total length was estimated with a regression model using the head length as independent variable. No significant...
Tipo: Journal Contribution
Palavras-chave: Size distribution; Regression analysis; Fishery surveys; Regression analysis; Http://aims.fao.org/aos/agrovoc/c_16335.
Ano: 2000
URL: http://hdl.handle.net/1834/2532

Algunos aspectos de la biología pesquera del langostino (Pleoticus muelleri)de la Bahía Blanca y un análisis del desembarco comercial del período 1955-1979
Provedor de dados: 20
Autores: Bertuche, D.A.; Wyngaard, J.G.
This study was carried out in order to get somme knowledge on the characteristics of the fisheries of the shrimp Pleoticus muelleri in the area of Bahia Blanca during 1980-1981. Monthly samplings in the fishing area were performed, and the landing data from 1955 to 1979 were analized.
Tipo: Journal Contribution
Palavras-chave: Size distribution; Growth curves; Length-weight relationships; Landing statistics; Yield; Shrimp culture.
Ano: 1982
URL: http://hdl.handle.net/1834/2053

Age et croîssance du chinchard à quelque jaune (trachurus méditerraneus) dans la région nord de la Tunisie
Provedor de dados: 20
Autores: Fezzani Serbaji, S.; Chemmam-A, B.; Ben Salem, M.
Le chinchard à queue jaune est un Carangidae qui fait l’objet d’une exploitation par les différents types de pêche le long des côtes tunisiennes. Dans le présent travail on se propose d’étudier l’âge et la croissance sur la base de la distribution des fréquences de taille dans la région Nord de la Tunisie. La décomposition de ces fréquences de taille est réalisée suivant la méthode de Battacharya (1967). Deux périodes sont considérées, la première correspond à l’année 1998 et la seconde s’étale entre Novembre -1999 et Décembre -2000. Pour la première période, 6 classes d’âges ont pu être identifiées alors que pour la seconde cette valeur est de 7. Les équations de croissance linéaire annuelle suivant le modèle Von Bertalanffy (1938) ont été établies.
Tipo: Journal Contribution
Palavras-chave: Trachurus mediterraneus; Age; Age composition; Frequency; Growth; Population structure; Size distribution; Horse mackerel fisheries; Age composition; Growth; Population structure; Age; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 2006
URL: http://hdl.handle.net/1834/4276

Some observations on the African catfish Clarias gariepinus (Burchell) in the Sondu-Miriu River of Lake Victoria, Kenya
Provedor de dados: 20
Autores: Lung'ayia, H.B.O.
The African catfish Clarias gariepinus (Burchell), has an intermitent     occurrence in the Sondu-Miriu river draining into lake Victoria.     Observations were made to get basic information on size composition,     migration, spawning period and food of this species in the river. A     total of 376 fish samples of fish ranging from 11.9 to 101.1 cm in     total length were examined from January to December 1989. A migration     of the fish between the lake and the river waters is indicated. Small     sized and immature fish were available in the river throughout the     year but their numbers became minimal in the dry season. Large and     mature specimens were caught mainly during the high water mark and     rainy seasons of April-June and...
Tipo: Proceedings Paper
Palavras-chave: Clarias gariepinus; Migrations; Population structure; Size distribution; Spawning; Population structure; Spawning; Freshwater catfish; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_3103.
Ano: 1994
URL: http://hdl.handle.net/1834/1159

Algunas características de la estructura y del comportamiento migratorio de los cardúmenes de caballa (Scomber japonicus marplatensis)en la plataforma bonaerense (Mar Argentino); período 1965-1984
Provedor de dados: 20
Autores: Cousseau, M.B.; Angelescu, V.A.; Perrotta, R.G.
Three periods were distinguished during the analyzed years: the first one (1965-1975)may be defined as "normal fishing seasons" occurring from October to March, with catches between 8,000 and 14,000 tons.
Tipo: Journal Contribution
Palavras-chave: Size distribution; Reproduction; Sexual maturity; Feeding; Landing statistics; Migrations; Geographical distribution; Feeding; Geographical distribution; Reproduction; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 1987
URL: http://hdl.handle.net/1834/2008

Estudio de la estructura de población del mero (Acanthistius brasilianus, Cuvier   Valenciennes); patrones de distribución, biomasa y rendimiento potencial
Provedor de dados: 20
Autores: Di Bussolo, R.A.; Minotti, P.G.
Tipo: Theses and Dissertations
Palavras-chave: Population structure; Potential yield; Biomass; Size distribution.
Ano: 1980
URL: http://hdl.handle.net/1834/4191

Variaciones de la abundancia numérica y biomasa del zooplancton de red en el Golfo San Jorge (año 1985)
Provedor de dados: 20
Autores: Pérez Seijas, G.M.; Ramirez, F.C.; Viñas, M.D.
A study was made on numercial and biomass variations of the zooplankton of the San Jorge Gulf (Argentina), based on samples from five cruises performed during 1985. The sampling was included within a proagramme for the biology and fishery evaluation of the shrimp Pleoticus muelleri. San Jorge, a large gulf of the northern patagonian shelf, comprises major fishery activities. Some fish species of economical importance depend on copepods for their feeding, like anchovy (Engraulis anchoita)or partially on middle-size plankters, like mackerel (Scomber japonicus). As a way for determining the trophic disponibility at the gulf, a study was made in order to express the numerical abundance of copepods, euphausiids and amphipods and other items of lesser...
Tipo: Journal Contribution
Palavras-chave: Zooplankton; Biomass; Size distribution; Population density; Zooplankton; Biomass; Population density; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 1987
URL: http://hdl.handle.net/1834/2006

Estimación de un índice de abundancia anual estandarizado para pescadilla de red (Cynoscion guatucupa), mediante la aplicación de un modelo lineal general; período 1992-2003
Provedor de dados: 20
Autores: Ruarte, C.O.; Perrotta, R.G.
The stripped weakfish (Cynoscion guatucupa) has a wide latitudinal distribution (22° S-43° S) and it is object of fishery in Brazil, Uruguay and Argentina (SW Atlantic). In this last country, it is mainly captured in the coastal region of Buenos Aires Province by means of a fleet, which has between 20 m and 30 m length. In Argentina, the average landings in the last 5 years were 9,900 t. It is the second commercial species among the coastal groups. There are two main fishery areas of this species: the Argentinean-Uruguayan Common Fishing Zone (AUCFZ) and the El Rincón area, in the South of bonaerense littoral. Due to the importance of this species, it is necessary to define an index of annual abundance to allow a suitable diagnosis of the fishery...
Tipo: Journal Contribution
Palavras-chave: Catch/effort; Size distribution; Abundance; Commercial fishing; Coastal fisheries; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 2007
URL: http://hdl.handle.net/1834/2519

Estructura poblacional del gatuzo (Mustelus shmitti) en la costa bonaerense y uruguaya asociada a condiciones oceanográficas.
Provedor de dados: 20
Autores: Massa, A.M.
The gatuzo, Mustelus schmitti, lives in the Southamerican Atlantic coastal waters from up to 23°S (Brazil)down to 47°S (Argentine), and is the greatest species of the Bonaerense and North Patagonian shores. This species is the most exploited elasmobranch of this region, within the last six years catch has exceeded 10,000 t per year and it is vulnerable to overexploitation due to reproductive aspects, with a low rate of changes, as well as distribution patterns. In order to relate size distribution and nursery areas, and environmental temperature and salinity variability, were obtained within six INIDEP 'Coastal Project' research cruises from 34° to 42°S from boundaries to 50 mts isobaths, during the spring seasons between 1994 to 1997. Cluster analysis...
Tipo: Theses and Dissertations
Palavras-chave: Size distribution; Age composition; Sex ratio; Growth curves; Environmental effects; Brackishwater environment; Age composition; Sex ratio; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 1998
URL: http://hdl.handle.net/1834/3584

Etude préliminaire de l'âge et de la croissance de l'espadon &lt;Xiphias gladius&gt; des eaux tunisiennes.
Provedor de dados: 20
Autores: Hattour, A.; Gaamour, A.; Ben Smida, M.A.
Une clé préliminaire âge taille et âge poids est présentée à partir d’un échantillonnage mené sur 212 espadon (Xiphias gladius L.) pêchés le long des côtes tunisiennes entre mars et septembre 2004. les tailles des poissons sont rangées de 60 cm à 173 cm, correspondant à des poids variant de 1,5 kg à 55 kg. L’analyse des coupes de la 2ème épine de la nageoire anale des espadons échantillonnés ont révélé que les âges sont rangés entre 0 et 5 années.
Tipo: Journal Contribution
Palavras-chave: Tuna fisheries; Age; Composition; Weight; Growth; Cosmopolite species; Population structure; Size distribution; Growth; Population structure; Age; Weight; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_186; Http://aims.fao.org/aos/agrovoc/c_8349.
Ano: 2005
URL: http://hdl.handle.net/1834/1535

Evaluación de la pescadilla de red (Cynoscion striatus) en la Zona Común de Pesca argentino-uruguaya, en el otoño de 1989
Provedor de dados: 20
Autores: Cioffi, C.A.
Tipo: Theses and Dissertations
Palavras-chave: Population structure; Biomass; Size distribution; Age; Fishery surveys; Population structure; Biomass; Age; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 1992
URL: http://hdl.handle.net/1834/3554

Reproductive biology of red squid (Ommastrephes bartramii) in the Southwest Atlantic
Provedor de dados: 20
Autores: Brunetti, N.E.; Ivanovic, M.L.; Aubone, A.; Pascual, L.N.
Red squid (Ommastrephes bartramii) samples were collected during six exploratory cruises carried out in the Southwest Atlantic region off Argentina and Uruguay (33° S-42° S; 43° W-55° W) during summer-autumn of the period 1997-2002 on board the japanese jigger “Shinko Maru N° 3” under a joint research programme approved by Japan and Argentina. Size ranges of the squids analyzed were 10-40 cm mantle length (ML) for males and 12-49 cm ML for females. Two groups of squids were identified: smaller and larger than 20 cm ML. The group under 20 cm ML was characterized by the presence of immature squids and a sex ratio of around 1:1 in the whole study area. The squids of more than 20 cm ML included from immature to mature individuals. The mean sizes, proportion of...
Tipo: Journal Contribution
Palavras-chave: Cephalopod fisheries; Size distribution; Sexual maturity; Sex ratio; Fishery surveys; Sexual maturity; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 2006
URL: http://hdl.handle.net/1834/2510

Evolución reciente de la captura por unidad de esfuerzo (1993-2004) y de las tallas medias (1993-2005) del pez palo (Percophis brasiliensis) en el litoral marítimo entre 34º S y 42º S
Provedor de dados: 20
Autores: Rico, M.R.; Perrotta, R.G.
Brazilian flathead (Percophis brasiliensis), of wide latitudinal distribution (23° S-47° S), is caught in Argentina in two coastal areas north and south of the Province of Buenos Aires delimited by the 39° S latitude. The species shows the highest abundance and catch yield percentages ( 5. ) of all coastal fish groups. The importance of the species makes it necessary to analyze mean lengths and define an annual abundance index that would allow to diagnose the state of the stock. To calculate the index the General Linear Model was adjusted. The factors used were Year, Quarter and 4 sub-areas, all statistically significant. The problem generated by the presence in the model of first order interactions that include the Year factor is discussed. It is...
Tipo: Journal Contribution
Palavras-chave: Catch/effort; Mathematical models; Size distribution; Coastal fisheries; Mathematical models; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_24199; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 2009
URL: http://hdl.handle.net/1834/3464

Zooplankton biomass in the reproductive area of the southern blue whiting (Micromesistius australis).
Provedor de dados: 20
Autores: Sabatini, M.; Alvarez Colombo, G.L.; Ramirez, F.C.
Total and size-fractioned zooplankton biomass (larger and smaller than 5 mm) were analyzed over two cruises conducted in the late austral winter (September 1994 and 1995) in the area surrounding Malvinas Islands at the time that massive spawning of southern blue whiting was expected to take place. Biomass was rather uniformly distributed in the area and dominated by the fraction larger than 5 mm in which euphausiids and secondarily chaetognaths were dominating in terms of both weight and number. The smaller fraction was mostly made up of copepods. From the high occurrence of euphausiids and seasonal abundance of the several species of copepods normally present within the area it was hypothesised that the feeding requirements of juvenile and adult blue...
Tipo: Journal Contribution
Palavras-chave: Zooplankton; Abundance; Size distribution; Biomass; Spawning seasons; Zooplankton; Biomass; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926.
Ano: 1999
URL: http://hdl.handle.net/1834/2568

Aspectos biológico-pesqueros de la merluza de cola del Atlántico Sudoccidental
Provedor de dados: 20
Autores: Bezzi, S.I.
The distribution areas and population structure of the long-tailed hake are analized. Data come from fisheries research cruises carried out by RV Walther Herwig and Shinkai Maru in the Argentine Sea in 1978/79. Macruronus magellanicus is a typical cold waters species of the Southwest Atlantic and Southeast Pacific Oceans. Maximum concentrations were found in the southern Patagonian shelf, in coastal waters and in depths below 200 m. Spawning individuals were observed on the continental slope in the southern extreme of the Patagonian shelf (54°). The distribution area extend to 93,439 n mi² in spring and to 12,368 n mi² in summer.
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Size distribution; Sexual maturity; Length-weight relationships; Hake fisheries; Geographical distribution; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 1984
URL: http://hdl.handle.net/1834/2046

Abundancia, reproducción y distribucion de tallas del gatuzo Mustelus schmitti en la Zona Comun de Pesca Argentino-Uruguaya y en el Rincón. Noviembre, 1994
Provedor de dados: 20
Autores: Cousseau, M.B.; Carozza, C.R.; Macchi, G.J.
Relative abundance, length distributions and reproductive condition of Mustelus schmitti are analyzed with samples obtained in the cruise H-13/94. Our results are compared with those obtained in other cruises. The samples were collected in the Argentine-Uruguayan Common Fishing Zone (AUCFZ) and El Rincón (Buenos Aires Prov., Argentina).
Tipo: Journal Contribution
Palavras-chave: Abundance; Reproduction; Fishery surveys; Size distribution; Reproduction; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1998
URL: http://hdl.handle.net/1834/2475

Composición por tallas y edades de las capturas comerciales de anchoíta bonaerense obtenidas entre 1990 y 2011
Provedor de dados: 20
Autores: Hansen, J.E.; Garciarena, A.D.
As part of the research programs performed yearly at the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP, Mar del Plata, Argentina) some important basic data about the commercial fisheries usually included in internal reports are registered. This formal paper is a review and summary of size and age composition estimates of commercial catches (discards included) of Northern Argentine anchovy (34ºS-41ºS) obtained between 1990-2011. The basic data resulting from the examination of 521 samples from fishing vessels included 62,466 fish length measurements and 26,667 valid age readings from which the corresponding 22 annual age-length keys were built. The annual estimates of the individual total length-total weight relation parameters and of...
Tipo: Journal Contribution
Palavras-chave: Pelagic fisheries; Stock assessment; Commercial fishing; Catch composition; Age composition; Size distribution; Clupeoid fisheries.
Ano: 2013
URL: http://hdl.handle.net/1834/5502

Le Rouget de roche (Mullus surmuletus l. 1758) des côtes nord tunisiennes : reproduction, sexualité et croissance
Provedor de dados: 20
Autores: M’rabet, R; Gharbi, H; Missaoui, H; Cherif, M.; Jarboui, O.
L’objectif principal de ce travail, est la réactualisation des paramètres biologiques du rouget de roches des côtes Nord tunisiennes qui sont indispensables pour toute étude ultérieure d’évaluation de stock. Le suivi mensuel du rapport gonado-somatique a montré que la période de ponte de rouget de roche s’étale sur 3 mois d’avril à juillet. La taille pour laquelle 50% des individus sont matures a été estimée à une longueur totale de 16,43cm pour les femelles et de 16,02cm pour les mâles. L’étude de la sex-ratio en fonction des mois a montré que les femelles sont toujours plus nombreuses que les mâles. La répartition des sexes en fonction de la longueur totale montre que les femelles dominent dans la plupart des classes de taille. Les équations...
Tipo: Journal Contribution
Palavras-chave: Mullus surmuletus; Biological surveys; Growth; Length-weight relationships; Sex ratio; Sexual maturity; Size distribution; Spawning; Growth; Spawning; Sexual maturity; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 2007
URL: http://hdl.handle.net/1834/4151

El dorado, Salminus maxillosus (Pisces, Characiformes)en el Río de la Plata y Río Uruguay inferior
Provedor de dados: 20
Autores: Sverlij, S.B.; Espinach Ros, A.
Catch per unit effort (CPUE), lenght distribution, age, growth, reproduction, migrations and feeding were studies through samples collected with longlines and a gang of gill-nets of several mesh size. CPUE data showed a progressive decrease of the relative abundance in the Río de la Plata, during the study period. Age was studied from scales. Back-calculations of growth revealed the pressence of Lee's phenomenon. Means lenghts at age were greater in females. No significant difference was found in lenght-weight regressions from both sexes and sampling areas. Only young individuals from 1 to 6 years were caught. None of the fish studied had ripening gonads. Extensive migrations were recorded both in the Paraná and Uruguay rivers. Stomach contents analysis...
Tipo: Journal Contribution
Palavras-chave: Migrations; Catch/effort; Sex ratio; Size distribution; Scale reading; Growth curves; Reproduction; Stomach content; Sex ratio; Reproduction; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1986
URL: http://hdl.handle.net/1834/2032

Etude préliminaire de l’age et de la croissance de l’espadon (&lt;Xiphias gladius&gt;) des eaux Tunisiennes
Provedor de dados: 20
Autores: Hattour, A.; Gaamour, A.; Ben Smida, M.A.
Une clé préliminaire âge taille et âge poids est présentée à partir d’un échantillonnage mené sur 212 espadon (Xiphias gladius L.) pêchés le long des côtes tunisiennes entre mars et septembre 2004. les tailles des poissons sont rangées de 60 cm à 173 cm, correspondant à des poids variant de 1,5 kg à 55 kg. L’analyse des coupes de la 2ème épine de la nageoire anale des espadons échantillonnés ont révélé que les âges sont rangés entre 0 et 5 années.
Tipo: Journal Contribution
Palavras-chave: Age composition; Cosmopolite species; Growth; Length; Size distribution; Tuna fisheries; Weight; Population structure; Age composition; Growth; Length; Population structure; Weight; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_4260; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_8349.
Ano: 2005
URL: http://hdl.handle.net/1834/3737

Pesca comercial y captura por unidad de esfuerzo de la merluza (Merluccius hubbsi) entre 34º S-41º S durante el período 1986-2005 y evidencias sobre cambios en la distribución y composición por tallas del recurso
Provedor de dados: 20
Autores: Irusta, G.; Castrucci, R.; Simonazzi, M.
The activity of the hake (Merluccius hubbsi) commercial offshore ice chilling fleet and its relation to concentration, distribution and population areas of the stock distributed between 34ºS - 41ºS is described. The catch per unit of effort (CPUE) for the 1986-2005 period was estimated applying the General Linear Model. Data derived from the offshore fishing logs provided by the Argentine Secretary of Agriculture, Farming, Fishing and Food Administration and the information obtained in research cruises carried out in 1994, 1996-2001, 2003-2005 to evaluate the resource population abundance. During the main fishing time in the sector (quarter 2) and up until 1991 the fleet scattered within the Argentine-Uruguayan Common Fishing Zone (SW Atlantic). Later on...
Tipo: Journal Contribution
Palavras-chave: Catch/effort; Commercial fishing; Catch statistics; Fishing effort; Size distribution; Exclusive economic zone; Gadoid fisheries; Marine environment; Marine environment; Fishing effort; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_24027.
Ano: 2009
URL: http://hdl.handle.net/1834/3462

Evaluación preliminar de los recursos pelágicos en el Área Común de Pesca Argentino-Uruguaya: año 1978-1979
Provedor de dados: 20
Autores: Nión, H.C.; Castaldo, H.A.; Barea, L.C.
En este trabajo se presenta una evaluación preliminar de los recursos pelágicos del frente oceánico del Río de la Plata y del área común de pesca argentino-uruguaya en el Atlántico Sudoccidental. Dicha evaluación fue llevada a cabo por el Gobierno de la República Oriental del Uruguay, durante la segunda fase del Preyecto Pesquero URU.71.517.
Tipo: Report
Palavras-chave: Pelagic fisheries; Geographical distribution; Size distribution; Zonal distribution; Sex ratio; Length-weight relationships; Stock assessment; Geographical distribution; Stock assessment; Pelagic fisheries; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 1980
URL: http://hdl.handle.net/1834/2556

Estudios de distribución de la anchoíta (Engraulis anchoita)en un área de extensión reducida. I. Densidades mínimas de muestreo para la estimación de algunos parámetros poblacionales
Provedor de dados: 20
Autores: Gru, D.L.; Hansen, J.E.
Results of a research cruise carried out to estimate some biological parameters of anchovy (Engraulis anchoita), during the major spawning season, were analyzed in order to determine the minimum number of samples required to obtain unbiased values. Twelve samples of fishes were taken within an area of 607 nm². Size (total length)distributions, slope of the length-weight relationship, sex ratio and age population structure were considered. Results suggest that those parameters should be estimated by eight or more samples (corresponding to 76 nm² each).
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Size distribution; Sex ratio; Age composition; Biological sampling; Age composition; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 1986
URL: http://hdl.handle.net/1834/2029

Dinámica y estructura poblacional del langostino colorado III y IV regiones. Informe Final, FIP n° 2005 -41
Provedor de dados: 20
Autores: Quiroz, J.C.; Montenegro, C.; Báez, P.; Espíndola, F.
Se reportan las actividades y resultados del proyecto FIP 2005-41 “Dinámica y estructura  poblacional del langostino colorado III y IV Regiones”. Para abordar el estudio de la dinámica y estructura poblacional de P. monodon, se plantearon dos hipótesis. Una postula que la especie posee una estructura poblacional a lo largo de la plataforma continental, en un gradiente latitudinal, en tanto que la otra plantea que la especie tiene una estructura poblacional a través de la plataforma continental, en un gradiente longitudinal. Para someter a pruebas estas hipótesis se realizaron varios análisis estadísticos de variables fundamentales del stock, como la densidad, los tamaños corporales, las edades y componentes del stock en función de su madurez. Los...
Tipo: Report
Palavras-chave: Population dynamics; Population structure; Size distribution; Spawning populations; Statistical models; Marine crustaceans; Population structure; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2006
URL: http://hdl.handle.net/1834/1505

Muestreo bioestadístico de pescado en el puerto de Mar del Plata. Anchoíta (Engraulis anchoita). Período 1986-1990
Provedor de dados: 20
Autores: Hansen, J.E.
This paper deals with the commercial landings of bonaerensis anchovy at the Port of Mar del Plata (Buenos Aires province,Argentina), during the years 1986 to 1990. The mean catch was 15,501t per year. A total of 59 fish samples were taken for total length distributions (N=20164), and 24 sub-samples (N=2370) were analyzed to record individual data (length, weight, sex, sexual stage, age fromotoliths reading). The numer of fish per kg ranged between 28 and 53(mean=34.6). The mean size was 156.63 mm, and the most abundant fish in the landings were those being 3 and 2 years old, as it was also recorded during the period 1980-1985. Ordinary length-weight relationships by season were fitted, and the results were as follows:1) Autumn-Winter: W=8.5* 10-7* L3.392;...
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Size distribution; Sexual maturity; Clupeoid fisheries; Biological sampling; Age composition; Commercial land use; Cohort analysis.
Ano: 1997
URL: http://hdl.handle.net/1834/5794

Retención de tallas de jaiba (Callinectes sapidus Rathbun, 1896: Decapoda, Portunidae) por mallas plásticas cuadradas y ventanas de escape circular
Provedor de dados: 20
Autores: Giménez Hurtado, E.; Delgado Castro, C.
El trabajo muestra las curvas de retención de tallas de jaiba azul obtenidas en nasas construidas con ventanas de escape de 45 y 50 mm de diámetro y mallas plásticas cuadradas de 25 mm (1pulgada) y 38,1 mm (1,5 pulgadas). El experimentó se realizó en el sector costero Sierra Morena (23004’N- 80043’W) – Pta. Higuereta (22º46’N 79046’W) en la costa norte de Villa Clara, Cuba. Se midieron 1061 jaibas estando representados ambos sexos en la captura. El número de ejemplares retenidos en cada talla son graficadas como proporciones retenidas para cada ventana de escape y mallas usadas en el experimento. Los resultados muestran que el tamaño de malla de 25 mm usado en las nasas de jaibas es muy ineficiente respecto al escape de tallas pequeñas ya que los...
Tipo: Journal Contribution
Palavras-chave: Crab fisheries; Size distribution; Coastal zone management; Management; Management; Http://aims.fao.org/aos/agrovoc/c_16086.
Ano: 2010
URL: http://hdl.handle.net/1834/3836

A case study of ships forming and not forming tracks in moderately polluted clouds
Provedor de dados: 27
Autores: Noone, K.J.; Öström, E.; Ferek, R.J.; Garrett, T.; Hobbs, P.V.; Johnson, D.W.; Taylor, J.P.; Russell, L.M.; Flagan, R.C.; Seinfeld, J.H.; O'Dowd, C.D.; Smith, M.H.; Durkee, P.A.; Nielsen, K.; Hudson, J.G.; Pockalny, R.A.; De Bock, L.; Van Grieken, R.E.; Gasparovic, R.F.; Brooks, I.
The effects of anthropogenic particulate emissions from ships on the radiative, microphysical, and chemical properties of m(oderately polluted marine stratiform clouds are examined. A case study of two ships in the same air mass is presented where one of the vessels caused a discernible ship track while the other did not. &lt;i&gt;In situ&lt;/i&gt; measurements of cloud droplet size distributions, liquid water content, and cloud radiative properties, as well as aerosol size distributions (outside cloud, interstitial, and cloud droplet residual particles) and aerosol chemistry, are presented. These are related to measurements of cloud radiative properties. The differences between the aerosol in the two ship plumes are discussed; these indicate that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerosols; Air pollution; Albedo; Anthropogenic factors; Atmospheric boundary layer; Atmospheric particulates; Chemical plumes; Cloud physics; Clouds; Droplets; Fuels; Ocean-atmosphere system; Pollution effects; Radiative transfer; Ships; Size distribution.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8840

Plankton size distributions and trophic relations before and after the construction of the storm-surge barrier in the Oosterschelde estuary
Provedor de dados: 27
Autores: Tackx, M.L.M.; Herman, P.M.J.; Van Rijswijk, P.; Vink, M.; Bakker, C.
Phytoplankton and zooplankton biomass distributions were calculated on a carbon basis for the inland part of the Oosterschelde, in the period before (1983), during (1984, 1986) and after (1987, 1988) the construction of the storm-surge barrier. In all years studied, both phytoplankton and zooplankton distributions are very irregular, and little consistent patterns emerge. The data were used to test the model of Sheldon et al. (1977). The observed standing stock ratios of zooplankton to phytoplankton agree with the model predictions in 1983, and are slightly higher during the period 1984-1987. In 1988, the model predictions are very different from the observed values, because of important changes in the zooplankton species abundance occurring in this year.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Particles; Particles; Particles; Plankton; Size distribution; Spectra; Zooplankton; Netherlands.
Ano: 1994
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2675

Population biology of the hermit crab Petrochirus diogenes (Linnaeus) (Crustacea, Decapoda) in Southern Brazil
Provedor de dados: 104
Autores: Turra,Alexander; Branco,Joaquim Olinto; Souto,Flávio Xavier.
The aim of this study was to provide information on the biology of a subtropical population ofthe hermit crab Petrochirus diogenes focusing size structure, sex ratio, reproductive period and morphometric relationships. Monthly samples were done between January and December 1995 at Armação of Itapocoroy, Penha, southern Brazil, using two over-trawls in depths from 6.0 to 10.0 m. A total of 126 individuais were collected. Overall sex ratio did not differ from 1:1. When the sex ratio was analyzed for each size class, it was skewed for females in the smallest size classes while males outnumbered females in the largest ones. The mean size (cephalothoracic length) of P. diogenes was 30.61 ± 12.52 mm and the size structure of this population was skewed to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Size distribution; Population structure; Sex ratio; Morphometric relationships; Reproductive activity.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000400008

Effects of moisture content and blade cutting speed on the chopping and size distribution of sugarcane leaves for the production of fuel biomass
Provedor de dados: 111
Autores: charee, singrun; Sudajan, Somposh; Junsiri, Chaiyan; Laloon, Kittipong; Oupathum, Chanin.
The objective of this study was to determine the effects of moisture content and blade cutting speed on the chopping and size distribution of sugarcane leaves. The experiments were conducted using 4 different moisture content percentages of 19.74, 30.97, 44.52 and 50.12 % w.b. and at the blade cutting speeds of 380, 630 and 880 rpm. The results revealed that moisture content and blade cutting speed significantly affected working capacity, weight and geometric mean particle length of the sugarcane leaves, and the results were statistically significant with confidence levels of 95%. The interaction of the two factors had a significant effect on the working capacity but did not affect the percent weight and geometric mean particle length of the sugarcane...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane leaves; Chopper; Size distribution; Fuel biomass.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6351

A divergent type grader for cocoa pods (Theobroma cacao L.)
Provedor de dados: 111
Autores: Rangaraju, Visvanathan.
The size distribution of cocoa pods was measured and the average length and breadth were 147.5 and 74.2 mm, respectively.  Based on length, the pods were categorized as less than 120 mm, 120 to 140 mm and above 140 mm, which were 28, 37 and 35% of the whole lot. The breadth varied from 60 mm to 110 mm and the major contribution was 18, 28, 36, 12, 4 and 2% for the ranges, below 70 mm, 70-80 mm, 80-85 mm, 85-90 mm, 90-100 mm and 100-110 mm, respectively.  A direct proportion between the length and breadth was noted.   The sphericity and aspect ratio ranged 0.54 to 0.68 and 0.4 to 0.57. The coefficient of static friction increased in the range 0.503 to 0.738 with moisture content range of 50.3 to 76.4% (d.b.) against various surfaces, also the rolling angle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cocoa pods; Size distribution; Divergent type grader; Capacity; Effectiveness.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7049

Population structure of Rudgea parquioides (Rubiaceae), a shade-tolerant shrub species, in Southern Brazil
Provedor de dados: 42
Autores: Cardoso,Fernanda C.G.; Salvalaggio,Ana P.B.; Marques,Márcia C.M.
The expectations that shade-tolerant forest species show 1) a population structure composed by a high amount of small individuals, and 2) biomass allocation for diameter higher than for height growth, were tested for Rudgea parquioides, a typical shrub in Southern Brazil. We described the size structure (height and stem diameter) and allometrical relations of a R. parquioides population by counting and measuring all the individuals in a 725m² area in the municipality of Curitiba (25"25'S; 49"19'W). A total of 916 individuals (12,634 ind.ha-1) were recorded in the area. The firstexpectation was supported, since distribution by height and diameter classes showed a predominance of small individuals (skewness coefficients &amp;gt; 1). On the other hand, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Araucaria forest; Size distribution; Subtropical forest; Understorey.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300011