Consulta: subjectFacets:"Length-weight relationships"
Registros recuperados: 38
Data/hora: 13/06/2024 00:38:37

Estudio biométrico, estructura poblacional y habitat del camarón Penaeus vannamei, Boone en criaderos
Provedor de dados: 20
Autores: Reinoso, B.
The present work is about biometry study, population structure and habitat Penaeus vannamei, Boone shrimp cultivated in ponds 939 shrimps were analised from March-July 1991 at a shrimp farm located in Hebano-Manabí port. The analysis demostrated that a strong difference exists between the male and female shrimp product of morphological diformis in this species. Also, the calculated correlation coeficient values were always near the unit indicated for us that the relations between the different averages were very narrow. The proportion of the sexes showed a clear predominance of the females over the males. The proportions being 60%/40% respectively. Aside from this, this population distribution remained steady during the period of the investigation. The...
Tipo: Journal Contribution
Palavras-chave: Biometrics; Habitat; Population characteristics; Breeding; Crustacean culture; Length-weight relationships; Breeding; Crustacean culture; Http://aims.fao.org/aos/agrovoc/c_49902; Http://aims.fao.org/aos/agrovoc/c_1985.
Ano: 1993
URL: http://hdl.handle.net/1834/3048

Relaciones peso seco-talla y volumen-talla en Themisto gaudichaudii, principal anfípodo hiperído del Mar Epicontinental Argentino.
Provedor de dados: 20
Autores: Alvarez Colombo, G.L.; Viñas, M.D.
Themisto gaudichaudii, the most abundant and widely distributed hyperiid amphipod in Argentine shelf waters, provides a source of food for several species of economical value such as the anchovy, mackerel, hake, and squid. Predictive dry weight-length and volume-length regression were established in order to provide an indirect estimation of the individual body mass from a measurement of body length. Samples were collected in San Jorge Gulf and fixed with a 4 o/o formaldehyde solution. The possible effect of formaldehyde fixation on dry weight and volume is discussed.
Tipo: Journal Contribution
Palavras-chave: Dry weight; Length-weight relationships.
Ano: 1994
URL: http://hdl.handle.net/1834/1928

Estudio de la condición nutricional de larvas de la población bonaerense de anchoíta (Engraulis anchoita) en relación con las características hidrográficas del área de crianza
Provedor de dados: 20
Autores: Díaz, M.V.; Pájaro, M.
The study of larvae nutritional condition allows to assess the physiologic state that reflects the environmental situation they were exposed to. It represents a useful instrument to determine favourable nursery areas, provides tools for the management of a population subject to fishing and furnishes information to establish appropriate closed areas and periods. The material analyzed derived from three cruises carried out to assess Argentine anchovy Northern stock during the 2003, 2004 and 2006 reproductive peak (SW Atlantic Ocean, Argentine Sea). The objective of this work was to study the nutritional status of Argentine anchovy first feeding larvae caught in the coastal and mid-shelf of the Río de la Plata River maritime front in relation to the...
Tipo: Journal Contribution
Palavras-chave: Fish larvae; Nursery grounds; Spawning populations; Morphometry; Length-weight relationships; Abundance.
Ano: 2013
URL: http://hdl.handle.net/1834/5496

Estudio de edad y crecimiento de la raya hocicuda Dipturus chilensis (Guichenot,1848) en el Atlántico Sudoccidental (34º -55º LS y 52º -69º LW)
Provedor de dados: 20
Autores: Zavatteri, A.
This paper deals with the age and growth parameters of the Southwest Atlantic beaked skate Dipturus chilensis, as well as with some reproductive features of the species. Samples of individuals inhabiting 34°-55°S and 52°- 69°W were analyzed. They were taken during surveys carried out by the National Institute for Fisheries Research and Development (INIDEP) research vessels, as well as by a landing sampling at Mar del Plata port. The fish age was determined by counting growth rings from thin sections of the vertebral centra of 414 fish ranging 24-110 cm (203 males) and 24-115 cm (211 females) total length. The vertebral sections were stained using cobalt  hloride. Both average per cent error (APE=5.94) and precision (D=5.89) indexes suggested that the...
Tipo: Theses and Dissertations
Palavras-chave: Age; Age determination; Growth; Length-weight relationships; Sexual maturity; Age determination; Growth; Age; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_186; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 2010
URL: http://hdl.handle.net/1834/3585

Consideraciones sobre el crecimiento de la caballa (Scomber japonicus marplatensis)durante su primer año de vida
Provedor de dados: 20
Autores: Sánchez, R.P.
Through the analysis of the morphological changes ocurring in the process of growth, it was possible to identify three stages (primary juvenile: 25-75 mm; secondary juvenile: 76-160 mm; and juvenile preadult: 161-250 mm)during the first year of the species life. Regression equations for the different relations studied: body weight/body lenght, body surface/body lenght, body surface/body weight, and metabolic rate/body lenght, have been calculated for each stage. The variation of the number of gill rakers, mean distance between adjacent rakers and mean values of gill rakers lenght in reference to body growth was studied, and the relation between filtering area and body length was established.
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Condition factor; Gills; Juveniles; Mackerel fisheries; Gills; Http://aims.fao.org/aos/agrovoc/c_3262.
Ano: 1982
URL: http://hdl.handle.net/1834/2047

Etude d’une population de l'algue brune Padina pavonica (L) Lamouroux a Cap Zebib (nord de la Tunisie)
Provedor de dados: 20
Autores: El Abed, A.; Ben Said, R.; Romdhane, M.S.
A population of the brown alga Padina pavonica has been studied in the locality of Cap Zebib (North of Tunisia) between September 2000 and August 2001. Abiotic factors (temperature ,salinity  , oxygen ) and biotic ones (weight, height, diameter, biomass, and fertility) were carried out . The results showed that temperature varied between 12°C (February) and 24.5 °C (July). Salinity has recorded a little variation during the year .Oxygen ranged between 4.4 mg/l( March) and 10mg/l (November).Padina pavonica changed monthly . The weight ranged between 0.39g (February) and 18.8 g (August)  . Minimum and maximum height were recorded respectively in January (2.07 cm) and September (7.3 cm) . Diameter varied between 1.32 cm (December) and 8.9 cm (August) ....
Tipo: Journal Contribution
Palavras-chave: Algae; Fertility; Biomass; Length-weight relationships; Brown algae; Http://aims.fao.org/aos/agrovoc/c_35039.
Ano: 2002
URL: http://hdl.handle.net/1834/247

Estudio sobre el crecimiento en peso y factor de condición en larvas de anchoíta, Engraulis anchoita Hubbs &amp; Marini. Variaciones regionales, estacionales y anuales
Provedor de dados: 20
Autores: de Ciechomski, J.D.; Sánchez, R.P.; Alespeiti, G.; Regidor, H.
The equation log W=a+bL (where W=dry weight in ug, and L=total length in mm)was used to describe the growth in weight of larval anchovy collected in two areas of the Argentine sea, sampled in different months and several years. Regression lines were compared by covariance analysis applied to two size groups, namely larvae less and over 10 mm total length, as an evident break in the slopes indicated the existence of a chenge of rythm in the trajectory of larval growth in length. Significant differences between the slopes of the growth lines were observed within the smaller size group. No regional or yearly differences could be established fo larvae larger than 10 mm.
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Fish larvae; Condition factor; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1986
URL: http://hdl.handle.net/1834/2023

Evaluación acústica de recursos pelágicos en las Islas Galápagos (diciembre de 1994)
Provedor de dados: 20
Autores: Vicuña, H.; Chalén, X.; Mendieta, E.; Aguilar, F.
A research survey was carried out in the southeast of the San Cristóbal island of the Galápagos Province (Galápagos Islands, Ecuador), between the 6th and 23th of december 1994; a 9 637 km2 was covered, from ca., 100 m depth waters. The Simrad EK-500 (38 kHz) acoustic equipment was used on board the I/V Tohallí of the National Fisheries Institute. The catch was compounded of 98% of makarell (Scomber japonicus) and 2% of south sardine (Sadinops sagax). The estimated results for biological and acoustic parameters for S. sagax were: sex ratio (male and female): 36% y 64%; furcal length range: 21-32 cm; mean legth: 26,6 cm; mean weith: 0,254 kg; theoreticals target strength and weight target strength (TS, TSkg): -38,9 dB and -33,0 dB. Mictofid catches were not...
Tipo: Journal Contribution
Palavras-chave: Pelagic fisheries; Length-weight relationships; Biomass; Biological data; Biomass; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 1995
URL: http://hdl.handle.net/1834/3019

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

Observaciones biométricas de una muestra de krill Antártico (Euphausia superba)
Provedor de dados: 20
Autores: Arcos, F.
De una muestra superficial de 226 individuos de krill Euphausia superba se han llevado a cabo determinaciones biométricas de longitud y peso para establecer las características de una parte de la población para correlacionar, por medio de la estadística, algunas variables de individuos machos y hembras separadamente.
Tipo: Journal Contribution
Palavras-chave: Krill fisheries; Marine crustaceans; Biometrics; Length-weight relationships; Polar zones.
Ano: 1990
URL: http://hdl.handle.net/1834/3799

Estimación de parámetros poblacionales del efectivo de sardina fueguina (Sprattus fuegensis) de la costa continental Argentina.
Provedor de dados: 20
Autores: Hansen, J.E.
Patagonian sprat is probably the only pelagic fish species having a considerable biomass within the Argentine Seasouth of 45ºS. There are two populations, the first inhabiting mainly the coastal region around Malvinas Islands and the other close to the coast off Santa Cruz and Tierra del Fuego Provinces, including the fuegian channels. Some results of two seasonal (autumn and spring) patagonian sprat assessment surveys carried out during 1996 are shown. The autumn cruise covered the area between 50° and 55°S, from the continental coast up to 60 m depth, whereas the spring survey extended upto 90 m depth including Le Maire Strait and part of the Beagle Channel. During both seasons, in waters ranging 6.2 - 8.8°C temperature, the species distributed very...
Tipo: Journal Contribution
Palavras-chave: Fishery surveys; Length-weight relationships; Sexual maturity; Growth; Mortality; Growth; Sexual maturity; Mortality; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999
URL: http://hdl.handle.net/1834/2530

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

Etude comparative du cycle sexuel  et de la relation taille-poids de deaux espèces d'athérine en Tunisie
Provedor de dados: 20
Autores: Bouriga, N.; Cherif, M.; Hajjej, Gh.; Guignard, J-P.; Faure, E.; Trabelsi, M.
Le présent travail porte sur l’étude des caractères biométriques des athérines de Tunisie pour compléter les études métriques et méristiques établies auparavant. L’objectif principal de cette étude, est de comparer les paramètres biologiques via l’analyse de la croissance et de la reproduction de Atherina boyeri (côtes nord tunisiennes) et Atherina lagunae (île Kerkennah). L’étude de la sex-ratio en fonction des mois a montré que les femelles sont toujours plus nombreuses que les mâles pour les espèces d’athérines. En effet, la valeur globale de la sex-ratio, toute taille confondue, est en faveur des femelles. L’étude du cycle sexuel des athérines insulaires des îles Kerkennah a montré que la période de reproduction s’établie entre le mois de mars et le...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Sex ratio; Growth rate; Length-weight relationships; Spawning seasons.
Ano: 2010
URL: http://hdl.handle.net/1834/4693

Relation taille–masse, condition relative et cycle sexuel des anchois et des sardines des côtesTunisiennes
Provedor de dados: 20
Autores: Khemiri, S.; Gaamour, A.
La biologie reproductive, la relation taille-masse ainsi que la condition relative de l’anchois Engraulis encrasicolus et de la sardine Sardina pilchardus ont été étudiées le long des régions Nord, Golfe de Tunis, la région Est et la région Sud des côtes tunisiennes durant la période 2000-2002.  Pour l’anchois et la sardine, la sex-ratio globale pour toutes les côtes tunisiennes est voisine de 1,0. L’acquisition de la taille de première maturité sexuelle semble être influencée par la température de l’eau dans les quatre régions. Les périodes de reproduction ont lieu dans les quatre régions d’avril à octobre pour l’anchois et d’octobre à mars pour la sardine. Dans les eaux tunisiennes, l’anchois et la sardine ont une allométrie majorante et une condition...
Tipo: Journal Contribution
Palavras-chave: Allometry; Condition factor; Length-weight relationships; Marine fish; Sex ratio; Sexual maturity; Sexual reproduction; Spawning seasons; Marine fishes.
Ano: 2009
URL: http://hdl.handle.net/1834/4487

Biometric relationships and fattning rate of bluefin tuna "Thunnus thynnus thynnus" L. 1758 in Tunisian fish farm
Provedor de dados: 20
Autores: Hattour, A.; Moussa, A.
An analysis of data from a Tunisian farm during the months of June to November of the year 2008 is presented. These data were broken down into two sets the first concern sampled fish while towing them to farm (wild set), the second set concern sampled specimen at the end of fattening process (fattening set). The wild group comprised specimens ranging from 90 to 276 cm fork length, and the fattened group included specimens from 105 to 310 сm. Juvenile proportion (Lf&lt;130 сm) in fattened specimen (15.7%) was considerably smaller compared to the proportion in wild specimens (61,8%). The distribution of individual weights of slaughtered BFT shows the prevalence 31-50 kg specimen class (60.4%). The L-W relationships were determined for each of these sets....
Tipo: Journal Contribution
Palavras-chave: Thunnus thynnus; Tuna fisheries; Length-weight relationships; Fish farms; Tuna; Fattening.
Ano: 2012
URL: http://hdl.handle.net/1834/5315

Relación largo-peso y largo-edad de primera madurez sexual de la merluza
Provedor de dados: 20
Autores: Simonazzi, M.
Estimations were made on the basis of a subsample of 6,734 individuals of Merluccius hubbsi from the Argentine Sea south of 41°S. Length-weight relation potential regression parameters were a=0.00950863, 0.01093448 and 0.01096117b=2.90831652, 2.86558431 and 2.86583191 for males, females and total individuals, respectively. The Newton algorithm was used to minimize the residuals. Maturity ogives were estimated with the logistic model adjusted by no lineal minimum quadratic ordinates. Length at first maturity at 50 was 33.79 cm for males and 35.38 cm for females. Age at first maturity estimated with the same model adjusted to the time elapsed from birth to catching was 2.61 and 2.67 years for males and females, respectively. Good fitting in all regressions...
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Sexual maturity; Age at recruitment; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 2003
URL: http://hdl.handle.net/1834/2422

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

Resultados de una campaña de investigación sobre la anchoíta (Engraulis anchoita)del sector bonaerense en el otoño de 1983. Distribución, abundancia y algunos aspectos biológico-pesqueros
Provedor de dados: 20
Autores: Hansen, J.E.; Gru, D.L.; Perrotta, R.G.
An extensive area of the continental shelf -between 37°20' and 34°40'S - was reviewed through hidroacoustical methods in order to evaluate the anchovy biomass. Within the area of highest concentration, further data on anchovy abundance were recorded, and fish samples were taken. Large anchovy shoals were located at about 170 nm from Mar del Plata, mainly in zones with sharp changes in oceanographic conditions. The distribution of the species was not uniform, but "contagious", and the log-normal distribution provided the best fit for the echo-integrator recorded data. The biomass was estimated at 1,061,727 tons (Confidence limits in between 921,010 and 1,223,930 tons). Some parameters of the population were estimated, such as: lenght-weight relationship,...
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Sex ratio; Age composition; Growth curves; Echo surveys; Mortality; Age composition; Sex ratio; Mortality; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1986
URL: http://hdl.handle.net/1834/2038

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

Length - weight relationship and condition factor of Phycis phycis (Linnaeus, 1766) and Phycis blennoides (Brünnich, 1768) [Actinopterygii, Gadiform, Phycidae] in the Gulf of Tunis
Provedor de dados: 20
Autores: Romdhani, A.; Ktari, M. H.; Mahé, K.
In our study length-weight relationship are presented for 213 Phycis phycis and 270 Phycis blennoides caught between September 2007 and August 2008 and collected from trawler fishing in the Gulf of Tunis. The lengthweight relationships and the condition factor were computed separately for sexes and for different seasons. The parameters of the length-weight relationship for the population as a whole are all well correlated (r2 &gt; 0.92, p &lt;0.001). The type of growth is isometric for P. phycis while it is majorant allometry for P. blennoides. The comparison of the regression of the weight according to the total length of males and females, of the two species, shows that the growth is therefore identical. The study of seasonal variations indicates that...
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Growth; Condition factor.
Ano: 2013
URL: http://hdl.handle.net/1834/5919

Alimentación del pez limón, Seriola lalandi (Valenciennes, 1833 in Cuvier y Valenciennes, 1833) en aguas bonaerenses
Provedor de dados: 20
Autores: Vergani, M.
The yellowtail kingfish, Seriola lalandi, Carangidae (Valenciennes, in Cuvier y Valenciennes, 1833) is a pelagic, schooling fish, with gregarious behaviour. It is a circumglobal species from tropical and temperate waters. Adult S. lalandi migrate to Argentine waters (SW Atlantic) during summer months (January-April). They have been reported from Argentine waters in depths of 20-36 m between 36°S and 38° and, as reported elsewhere in the world, are often associated with rocky reefs. Samples of S. lalandi were caught using trolling lines during daytime around rocky reefs at 35° 52'-35° 58'S and 54° 45'-54° 48'W, on February 15-22, 2002. Sixty-six adult S. lalandi were analyzed, with specimens measured (LT) and weighted (WT). The length-weight relationship...
Tipo: Theses and Dissertations
Palavras-chave: Feeding behaviour; Feeding migrations; Nursery grounds; Stomach content; Taxonomy; Length-weight relationships; Feeding behaviour; Taxonomy; Nursery grounds; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_25438.
Ano: 2005
URL: http://hdl.handle.net/1834/2561

Sex-ratio, relation taille-masse et coefficient de condition de la thonine commune "Euthynnus alletteratus (rafinesque, 1810)" des côtes Tunisiennes
Provedor de dados: 20
Autores: Hajjej, G.; Hattour, A.; Allaya, H.; Jarboui, O.; Bouain, A.
Cette étude, présente des informations sur le sex-ratio, la relation taille-masse et le coefficient de condition de la thonine commune Euthynnus alletteratus (Rafinesque, 1810) collectée à divers endroits des côtes tunisiennes entre janvier 2008 et septembre 2009. Le nombre total des individus collectés était de 536. La longueur à la fourche était comprise entre 19,2 et 97,8cm. Les résultats obtenus montrent que le sex-ratio est significativement en faveur des femelles et varie également avec la taille. Une allométrie négative a été établie pour les mâles ainsi que pour les femelles. Les valeurs calculées du coefficient de condition chez Euthynnus alletteratus  sont 1,606 pour les femelles et  1,587 pour les mâles.
Tipo: Journal Contribution
Palavras-chave: Sex ratio; Length-weight relationships; Tuna fisheries.
Ano: 2009
URL: http://hdl.handle.net/1834/4696

Distribución, áreas de concentración y estructura de la población del abadejo (Genypterus blacodes)
Provedor de dados: 20
Autores: Renzi, M.A.
The "abadejo" is one of the species that has been traditionally exploited in the Argentine Sea. Although the capture was not very important, it has been increased in the last years. In this work, the structure of the concentration areas of summer, spring and winter distribution and other biological items were analyzed, basing on the data collected during cruises effected by R/V "Walther Herwing" and R/V "Shinkai Maru" in these waters during 1978/79. Winter and spring distribution patterns showed the highest concentrations located between 41º and 48º SL, specially on the slope. Summer distribution pattern showed the concentration areas located between 43º30' and 48º30' LS shifted rather to the coast when comparing to the previous one. During the winter, in...
Tipo: Theses and Dissertations
Palavras-chave: Geographical distribution; Population structure; Feeding; Length-weight relationships; Stomach content; Diets; Seasonal distribution.
Ano: 1982
URL: http://hdl.handle.net/1834/5028

Dynamique de la population de Sandre  Stizostedion Lucioperca
Provedor de dados: 20
Autores: Toujani, R.; Kraiem, M.M.
L’étude de la dynamique de population du sandre Stizostedion lucioperca dans la retenue du barrage de Sidi Salem (nord de la Tunisie) a été réalisée durant deux saisons : avril 1996 - mars 1998 . Elle a porté sur un échantillon de 1325 individus capturés par les pêcheurs professionnels. Cette étude a montré que: - La taille moyenne individuelle des sandres captures est inférieure à 30 cm pour une proportion supérieure à 75 % . - La taille de recrutement dans la pêcherie estimée à 18 cm est très inférieure à la taille de première maturité sexuelle de l’ espèce qui est de 24 cm. - La taille et la masse individuelles moyennes des sandres capturés se sont améliorées durant la saison 1997 par rapport à celle de 1996. - Le taux de mortalité par pêche des groupes...
Tipo: Journal Contribution
Palavras-chave: Taille; Mortalité; Length-weight relationships; Recrutement; Masse; Recruitment; Stizostedion lucioperca; Mortality; Freshwater fish; Population dynamics; Pike perch; Http://aims.fao.org/aos/agrovoc/c_5877.
Ano: 2002
URL: http://hdl.handle.net/1834/221

Estudio de edad y crecimiento del besugo Pagrus pagrus del sector costero bonaerense
Provedor de dados: 20
Autores: Cotrina, C.P.; Raimondo, M.C.
The samples analyzed for growth parameters determination both in length and weight of the red porgy Pagrus pagrus corresponded to the years 1972 up to 1981 and to two areas of the Buenos Aires (Argentina)coastal shelf: a northern one (35°-36°S)and a southern one (39°-40°). Through age determination, based on the countdown of rings in scales, the parameters of the von Bertalanffy growth equation for the two mentioned areas were estimated as follows: 1)northern area:Lý=44.7;k=0.154;to=-2.96, and 2)southern area:Lý=49.9;k=0.153;to=-2.81. The results shown that the infinite length of the red porgy from the southern area was the greatest. The maximum likelihood method permitted to calculate, for each region,the three parameters and the respective confidence...
Tipo: Journal Contribution
Palavras-chave: Age determination; Growth; Length-weight relationships; Age determination; Growth; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_3394.
Ano: 1997
URL: http://hdl.handle.net/1834/1937

Muestreo de desembarque de caballa (Scomber japonicus) en el puerto de Mar del Plata (38° S) y determinación de niveles de captura en el área El Rincón; período 1989-2003
Provedor de dados: 20
Autores: Perrotta, R.G.; Garciarena, A.D.; Hernandez, D.R.
Chub mackerel caught by the commercial fleet in El Rincón (39°-41° 30’ S) and Mar del Plata (38° S) areas was analyzed. In 2001 and 2002 samples from El Rincón were obtained from landings or collected by scientific observers on board the commercial ships. Samples from Mar del Plata were acquired during the 2001-2002 and 2002-2003 fishing seasons, on board two vessels of the small purse-seine fleet. Landings were mostly adults and only a small fraction of juveniles was observed (&lt; 5%). Length growth parameters from El Rincón samples were estimated, and length-weight and length-age relationships were fitted by Least Squares. The results were as follows: L(mm) = 538.4; k (years-1) = 0.122; t0 (years) = -4.92; Pt = 4*10-7 * Lt 3.536. Natural mortality was...
Tipo: Journal Contribution
Palavras-chave: Landing statistics; Catch/effort; Growth; Commercial fishing; Length-weight relationships; Growth; Http://aims.fao.org/aos/agrovoc/c_3394.
Ano: 2007
URL: http://hdl.handle.net/1834/2516

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

Evaluación de recursos pelágicos pequeños al este de las Islas Galápagos durante abril de 1995
Provedor de dados: 20
Autores: Vicuña, H.; Chalén, X.
The document presents results from the pelagic acoustic research survey, executed at the East zone of the Galápagos Islands, between April and May 1995. A total of ca., 15 500 km² was covered. The following species were identified in the catch: mackarel (Scomber japonicus), south sardine (Sardinops sagax), mictophids (Lampanyctus spp.), and small specimens of giant squid (Dosidicus gigas). Mean legth and weight for mackarel and south sardine were 26,3 cm FL/0,251 kg and 18,6 cm TL/0,051 kg respectively. The estimated density for small pelagic fish of comercial interest (mackarel and sardine) was of 10,5 km². The estimated biomass for mackarel was ca., 125 000 t whereas for sardine was ca., 36 000 t. The current results coincide with those of March-April...
Tipo: Journal Contribution
Palavras-chave: Pelagic fisheries; Length-weight relationships; Biomass; Stock assessment; Echo surveys; Biomass; Stock assessment; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 1995
URL: http://hdl.handle.net/1834/3022

Características biológicas y de la pesca del savorín Seriolella porosa (Pisces: Centrolophidae) del Mar Argentino
Provedor de dados: 20
Autores: Garciarena, A.D.; Perrotta, R.G.
Length growth parameters were calculated and total length-weight and total length-fork length relationships, which showed no differences between sexes, were fitted for the South Atlantic bream (Seriolella porosa). Length at first maturity was also calculated. The results were as follows: L (mm)= 490.96k years-¹) = 0.154; t0 (years)= -3.915; W(g) = 4*10-6)*TL³.1989; FL(mm) = 0.8917*TL1.0006);L sub 50 (mm)= 290.61. Natural mortality was estimated at 0.274 and limit age at 11 years. Samples were taken during research surveys carried out in 1999 and 2000 in the Argentine Sea (Atlantic SW). Sagittae otoliths of 374 specimen were used for age determination. Total fish length ranged from 226 mm to 550 mm (1-14 years). Commercial landing data of trawl fleets for...
Tipo: Journal Contribution
Palavras-chave: Growth rate; Natural mortality; Length-weight relationships; Catch/effort; Landing statistics; Fishery biology; Fishery resources; Growth rate; Fishery biology; Fishery resources; Http://aims.fao.org/aos/agrovoc/c_16130; Http://aims.fao.org/aos/agrovoc/c_2937; Http://aims.fao.org/aos/agrovoc/c_2942.
Ano: 2002
URL: http://hdl.handle.net/1834/2416

Crecimiento y mortalidad de la castañeta Cheilodactylus bergien la zona común de pesca Argentino-Uruguaya
Provedor de dados: 20
Autores: Wöhler, O.C.
Growth parameters based on age assignation, length-weight relationship and mortality rates of castañeta Cheilodactylus bergi were studied. Samples came from landings at Mar del Plata Port(Buenos Aires province, Argentina) during 1989, and from a research cruise carried out in the Argentine-Uruguayan Common Fishing Zone(CFZ) during 1991. Castañeta is a longeval demersal species. The growth parameters of von Bertalanffy special model were: 1) Lý 31.95,34.69, 32,30; 2) K 040, 033, 039; and 3) t0 0.00, -0.16, 0.03 corresponding to males, females and all fish respectively. The rates of total mortality (Z) were 0.18, 0.16 and 0.17 for males, females and all fish, respectively. Because of the low rate of exploitation during the study, this values can be used as...
Tipo: Journal Contribution
Palavras-chave: Growth; Mortality; Length-weight relationships.
Ano: 1997
URL: http://hdl.handle.net/1834/5792

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

Estrutura da população e relação peso-comprimento de Engraulicypris sardella (Gunther, 1968) capturado no Lago Niassa, Região de Metangula, Moçambique
Provedor de dados: 20
Autores: PEGADO, Antonio J.
The present study analyses the length frequency distribution and total length-weight relationship of Engraulicypris sardella, a Cyprinidae fish endemic to Lake Niassa and the most caught in the lake. Fish were sampled from January to December 2012 through artisanal catches landing at Metangula. Results indicate that the total length (cm) from 1,449 specimens varies from 1.5 to 12.5 cm and the average was 9.26 cm ± 2.47. Engraulicypris sardella exhibited recruitment between August to December. The lengthweight relationship is expressed as the following equation P(g) = 0.00497*CT(cm)3.12 and suggests the isometric growth in this species. Further studies about length, growth and abundance were recommended
Tipo: Journal Contribution
Palavras-chave: Length frequency; Length-weight relationships; Engraulicypris sardella.
Ano: 2013
URL: http://hdl.handle.net/1834/5300

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

Ecología trófica de la anchoíta (Engraulidae, Engraulis anchoita)del Mar Argentino. Parte III. Requerimiento trófico individual en relación con el crecimiento, ciclo sexual y las migraciones estacionales
Provedor de dados: 20
Autores: Angelescu, V.A.; Anganuzzi, A.
The paper was developed in order to arrange the data gathered on this subject and to generate new hypotheses in connection with the trophic strategy of the northern stock of anchovy in the area between latitudes 35°-42°S. Such estimates were finally compared with the values of the gravimetric determinations of stomach contents- as converted to caloric values - of individuals grouped by total-length amd age classes, ecological areas, and seasons of the year. The set of results as obtained conforms the initial basis for developing Part IV of the Trophic Ecology of the Argentine anchovy as related to food consumption estimates, by stock biomass and annual classes, with back-calculations to age class 0, and for applying "regional patterns" that result from the...
Tipo: Journal Contribution
Palavras-chave: Growth curves; Bioenergetics; Migrations; Length-weight relationships; Condition factor.
Ano: 1986
URL: http://hdl.handle.net/1834/2022

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

Length-based estimates of growth parameters and mortality rates of fish populations from a coastal zone in the Southeastern Brazil
Provedor de dados: 103
Autores: Costa,Marcus Rodrigues da; Tubino,Rafael de Almeida; Monteiro-Neto,Cassiano.
ABSTRACT Small-scale fisheries in Brazil contribute to a significant share of total fish production, accessing a large variety of species. Life history parameters from these resources are important for their management and conservation, based on primary data. The objective of this article is to generate growth parameters and mortality rates of ten fish populations from a coastal zone in Southeastern Brazil. Monthly samples were taken between January 2011 and November 2014 from landings of the beach-seine fishery in an area adjacent to the entrance of the Guanabara Bay. All fishes were measured (total length) and weighed. The length-weight relationships (LWR) were estimated by linear regression analysis on log-transformed data of the equation: W = aL  b ....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ichthyofauna; Length-weight relationships; Life history; Shallow waters; Small-scale fisheries.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100343

Length-weight relationships for five cladoceran species in an Amazonian lake
Provedor de dados: 52
Autores: Maia-Barbosa,Paulina Maria; Bozelli,Reinaldo Luiz.
This work shows the length-weight regressions established for the five most frequent and abundant cladoceran species (Bosmina hagmanni, Bosminopsis deitersi, Ceriodaphnia cornuta, Diaphanosoma birgei, and Moina minuta) in two stations at Lake Batata. This lake has received for 10 years very fine bauxite processing tailings, which is responsible for the thick layer over the natural sediment still observed in its western section (impacted station). The individuals were separated into size classes, the dry weight values were determined for each class and were used for establishing weight-length equations. Bosminopsis deitersi and Ceriodaphnia cornuta were the species showing the smallest size in the two sampled areas (0.152 to 0.322 mm) and Diaphanosoma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian lake; Zooplankton; Cladoceran; Length-weight relationships.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000200018