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Registros recuperados: 21
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Age et croîssance du chinchard à quelque jaune (trachurus méditerraneus) dans la région nord de la Tunisie OceanDocs
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
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Caractérisation biologique et variation des captures de la grande alose (Alosa alosa) par unité d'effort sur le fleuve Adour (Pyrénées Atlantiques, France) ArchiMer
Prouzet, Patrick; Martinet, Jean-pierre; Badia, Jacques.
The study of logbooks from commercial fishermen on the Adour River and commercial samples allowed characterization of the allis shad population (Alosa alosa L.) caught during the period 1988-91. A better knowledge of the influence of hydroclimatic factors (rate of river flow and intensity of tidal coefficient) on the catchability of the species in that never was also obtained. Allis shad are mainly recruited to this fishery from the beginning of April to the end of May: between 78 and 89 % depending on year. Males in the population were on average younger than females. However, at the same age, males were significantly smaller in size and in weight than females. These results reinforce the knowledge already obtained on French stocks in the Loire and...
Tipo: Text Palavras-chave: Alosa alosa; Grande alose ou alose vraie; Clupéidés; Captures; Stock; Pêche; Âge; Débit fluvial; Courant de marée; Atlantique; Alosa alosa; Allis shad; Clupeidae; Catch; Fishing effort; Stock assessment; Age composition; Flow and tidal currents; Atlantic.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00188/29891/28336.pdf
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Composición por tallas y edades de las capturas comerciales de anchoíta bonaerense obtenidas entre 1990 y 2011 OceanDocs
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
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Echantillonnage des debarquements en criee pour l'etude des structures demographiques. Sources de variabilite et optimisation du plan de sondage ArchiMer
Chevalier, Robert.
The author analyzed problems encountered in selecting a sampling design for estimating the age structures of landings. He studied the effects of various factors of variability on the optimal values of the sampling rates. The method used for this analysis could be employed to define an optimal sampling strategy to assess the age structures of landings from fish markets.
Tipo: Text Palavras-chave: Statistical sampling; Fish; Population structure; Age composition; Landing statistics.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/publication-1772.pdf
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Estructura poblacional del gatuzo (Mustelus shmitti) en la costa bonaerense y uruguaya asociada a condiciones oceanográficas. OceanDocs
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
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Estructura por edad y sexo de la captura de merluza desembarcada. Período 1986-1998 OceanDocs
Renzi, M.A..
During the 1986-1998 period the hake (Merluccius hubbsi) fishery in the Argentine Sea (SW Atlantic) turned from moderate to intense exploitation. Age and sex structure analysis showed a change in the exploitation pattern. During the three periods defined 1986-1989, 1990-1992 and 1993-1998 a trend towards catching young individuals and a predominance of females age 3 and older was observed. An increase of total mortality was also detected. As a consequence of the establishment of a closed area in mid 1997 ice-chilling and freezer fleets changed operation areas which brought about differences in the catch structure. Freezers showed higher percentages of older ages. An average decrease of 30 in yield number of individuals per unit effort for all ages was...
Tipo: Journal Contribution Palavras-chave: Age composition; Sex ratio; Landing statistics; Gadoid fisheries; Age composition; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 2003 URL: http://hdl.handle.net/1834/2423
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Estructura por edad y sexo de la población de merluza OceanDocs
Renzi, M.A.; Santos, B.A.; Simonazzi, M..
Hake Merluccius hubbsi population structure in 1993, 1994, 1996, 1997 and 1998 and age and sex distribution during 1997 are analyzed. Data were obtained in research surveys. At the end of winter 1997 concentrations of juveniles were found in the San Jorge Gulf Argentine Sea, SW Atlantic, with maximum yields of 10,000 individuals per trawl hour for age 1 and 2,500 individuals per trawl hour for age 2. The highest concentrations of adults were found in the Gulf and South of 47°S, between the 100 and 200 m isobath, maximum yields of up to 1,700 individuals per trawl hour for age 3 and up to 90 individuals per trawl hour for age 7 and older. In spite of the decrease in population abundance, the basic age structure juveniles, young adults and old adults was...
Tipo: Journal Contribution Palavras-chave: Sex ratio; Age composition; Mortality; Fishery surveys; Gadoid fisheries; 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: 2003 URL: http://hdl.handle.net/1834/2471
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Estudio de edad y crecimiento de la sardina fueguina (Sprattus fuegensis)de las costas de la provincia de Santa Cruz e Islas Malvinas OceanDocs
Cousseau, M.B.; Gru, D.L..
Samples of Sardina fueguina (Sprattus fuegensis)were taken during research cruises carried out in 1974 and 1978. Length and age frequency distributions were analyzed, and von Bertalanffy growth parameters were calculated for the coastal waters of two geographical regions: Province of Santa Cruz and northern part of Malvinas Islands. Lenght and weight growth curves have been calculated for each region and each year. Marked differences have been found between gowth parameters of both regions, and the calculated values showed a good fit with the observed ones. According to these results, it is possible to assume that the sardines of both regions constitute two different populations. However, more information on the total distribution of the species will have...
Tipo: Journal Contribution Palavras-chave: Age composition; Growth curves; Stock identification; Sardine fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093.
Ano: 1982 URL: http://hdl.handle.net/1834/2052
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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 OceanDocs
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
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Etude préliminaire de l’age et de la croissance de l’espadon (<Xiphias gladius>) des eaux Tunisiennes OceanDocs
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
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Evaluación hidroacústica del stock parental de merluza de tres aletas en su unidad de pesquería, año 2003. Informe final corregido OceanDocs
Lillo, S.; Céspedes, R.; Díaz, E.; Ojeda, V..
El presente estudio tiene como objetivo evaluar el stock de merluza de tres aletas (Micromesistius australis) a través del método hidroacústico, entre las latitudes 47º y 51º Sur. Como parte del proyecto, se realizó entre el 2 y el 15 de agosto del 2003 a bordo del B/C “Abate Molina” un crucero de prospección dirigido a evaluar mediante un método de evaluación directa (evaluación acústica) su biomasa, abundancia y distribución, estimar la importancia relativa de la fauna acompañante, condiciones reproductivas y tróficas del stock. Durante el estudio se realizaron 13 lances de pesca y 49 transectas acústicas. Los resultados muestran que la merluza de tres aletas se distribuyó asociada al borde de la plataforma y talud continental, con una biomasa estimada...
Tipo: Report Palavras-chave: Stock assessment; Biomass; Population structure; Age composition; Geographical distribution; Acoustic equipment; Stock assessment; Biomass; Population structure; Age composition; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 2004 URL: http://hdl.handle.net/1834/1698
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Exploitation et structure des anguilles de dévalaison dans les lagunes aménagées du bassin d'Arcachon ArchiMer
Lee, Tae-won.
The fishing by the sluice, employed in the brackish fish ponds of Arcachon Bay, catchs only the migrating eels. The exploitation by this process is not more than the 18 percent of the biomass. The structure of the migrating eels caught in winter 1977-78 was estimated using the double sampling method with length as strata. The sex­ratio was about 1.1. The males migrate to the sea from 3 to 7 years after of the brackish water life (maximum 5 years old) and the females leave the fish ponds, generally from 5 to 9 years after (maximum 7 years old). The estimated mean lengths, 37.5 cm for the males and 49.8 cm for the females, were much smaller than-those which were estimated in the Italian "Vallis"
Tipo: Text Palavras-chave: Pêche à l'écluse; Exploitation; Anguilles de dévalaison; Double échantillonnage; Sex-ratio; Structure d'âge; Taille moyenne; Fishing by the sluice; Exploitation; Migrating eels; Double sampling; Sex-ratio; Age composition; Mean length.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41684/40893.pdf
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Improvements in the Ghanaian tuna statistics system OceanDocs
Quartey, R.; Bannerman, P..
Light fishing operations (LFO) in Ghana is concentrated in the three major coastal municipalities of Greater Accra (Tema), Central (Mumford & Elmina) and Western (Sekondi) Regions; these areas have the port facilities for landing of the catch by the larger inshore vessels that operate the purse seine fishery in Ghana and which predominantly operate the light attraction. Currently there are about 250 registered inshore vessels in the country whose sizes range between 39 – 60 feet , only a small fraction are actually working at the moment due to problems with spare parts and operations. Light attraction is the technique of aggregating fish by artificial light; and light fishing is the process of fishing the attracted fish by hooking, gill-netting or by...
Tipo: Report Palavras-chave: Age composition; Biological sampling; Exclusive economic zone; Exploitation; Fish catch statistics; Tuna fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093.
Ano: 2005 URL: http://hdl.handle.net/1834/1266
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Influencia ambiental en la distribución espacial de las clases de edad de pez palo (Percophis brasiliensis) en el Sistema Costero del Atlántico Sudoccidental (34°-41° S) OceanDocs
Barretto, A.C..
The age-class distribution of the Brazilian flathead Percophis brasiliensis in relation to environmental variables in spring and winter, and the growth of both sexes, were studied in the SW Atlantic Coastal System (SACS)(34°S-31° S). Growth was studied from 1449 individuals (n=853, spring (1998 + 2000), n=596, winter (2004)) to which size (TL), sex, and age were determined. Age was determined considering that an opaque plus a hyaline band (present in the transverse section of the sagitta otolith) represented 1 year of life. The age-class distribution in spring and winter was established through hierarchical clustering and non-metric multi-dimensional scaling (nMDS analysis). This analysis grouped sampling stations (n=109, spring 1998; n=160, winter 2004)...
Tipo: Theses and Dissertations Palavras-chave: Age groups; Age composition; Environmental factors; Geographical distribution; Population structure; Growth; Environmental effects; Coastal waters; Age composition; Environmental factors; Geographical distribution; Population structure; Growth; Age groups; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_28628; Http://aims.fao.org/aos/agrovoc/c_25205.
Ano: 2007 URL: http://hdl.handle.net/1834/3017
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L'alimentation de Diplodus annualris, Diplodus sargus, Diplodus vulgaris et Sparus aurata (Pisces, Sparidae) dnas le golfe du Lion et les lagunes littorales. ArchiMer
Rosecchi, E.
The four Sparidae studied are coastal species that regularly enter the Mediterranean coastal salt lagoons. Changes in diet with regard to size class of fish, and occasionally season, are detailed. For each species, diets in the sea and in the lagoons are compared using several methods and show differences. Individuals from lagoons do not eat, or in very low numbers, mollusks, echinoderms and decapods. However, as their feeding is very rich and diverse, sparid fishes can probably find in the lagoons, whatever their age, the prey necessary to their growth. Trophic factors cannot explain age structure in lagoons and the absence of some age classes.
Tipo: Text Palavras-chave: Pisces; Sparidae; Trophic levels; Age composition; Predation.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/publication-1774.pdf
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Muestreo bioestadístico de pescado en el puerto de Mar del Plata. Anchoíta (Engraulis anchoita). Período 1986-1990 OceanDocs
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
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Notes on nine biological indicators estimable from trawl surveys with an illustrative assessment for North Sea cod ArchiMer
Cotter, John; Mesnil, Benoit; Witthames, Peter; Parker-humphreys, Matt.
This paper reviews a selection of nine indicators for assessing the biological state of a fish population monitored only by using trawl surveys in which catchability is assumed constant from time to time and place to place. The intention is to inform or remind of the range of possibilities and of associated practical and statistical issues. The indicators, grouped according to relationships with abundance, length, age, weight, and reproduction, are documented in a standard format covering estimation, interpretability, sensitivity, considerations for reference points where possible, and an example of their application. Lastly, selected indicators together with year-class curves fitted to abundance indices-at-age are applied to the North Sea cod to...
Tipo: Text Palavras-chave: Ecosystem approach to fisheries management; Year class curves; Weight index; Maturity stage; Age composition; Length based indicators; Biological indicators.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6901.pdf
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Peche de l'anchois (Engraulis encrasicholus ) dans le golfe de Gascogne et sur le littoral atlantique de Galice depuis 1920. Variations quantitatives. ArchiMer
Junquera, Susana.
Using the fishing records from the most relevant ports of the Cantabrian and Galician coasts, th history of the anchovy (Engraulis encrasicholus ) fishery in this area is reconstituted. The crisis observed and the variations in the fishing areas throughout the time are analyzed. An estimation of the age classes composition in the catches founded on commercial classification data can be made. The hypothesis of existence of a core population in the Southern part of the Bay of Biscay is presented and that only under certain advantageous condition the expansion of this species throughout all the Cantabrian Sea was possible.
Tipo: Text Palavras-chave: Pisces; Age composition; Population dynamics; Catch/effort; Fishery statistics.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/publication-1795.pdf
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Programa temporal de evaluación hidroacústica de merluza del sur en aguas interiores de la X y XI Regiones, año 2002. Informe final corregido OceanDocs
Lillo, S.; Céspedes, R.; Barbieri, M.A.; Saavedra, A.; Gálvez, P..
Se presentan los resultados de la evaluación de la biomasa y la distribución espacial de la merluza del sur (Merluccius australis), estructurado por tallas y edad en las aguas interiores de la X y XI Regiones aplicando el método hidroacústico. También se estima la abundancia relativa y la importancia de la fauna acompañante proveniente de los lances de pesca con arrastre a mediagua. Con la información recolectada en el Crucero y en la pesquería se plantea un modelo de dinámica espacio temporal del stock. Los datos fueron colectados en dos cruceros de prospección realizados a bordo del B/C “Abate Molina”, entre el 4 y 18 de febrero (verano) y el desde el 1 al 14 de septiembre del 2003 (invierno). Los resultados mostraron que la merluza del sur era el...
Tipo: Report Palavras-chave: Population structure; Stock assessment; Age composition; Biomass; Geographical distribution; Body size; Acoustic equipment; Population structure; Stock assessment; Age composition; Biomass; Geographical distribution; Body size; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_35330.
Ano: 2004 URL: http://hdl.handle.net/1834/1696
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Recomendación de capturas biológicamente aceptables de anchoíta patagónica (Engraulis anchoita, 41º S-48º S) durante 2012 OceanDocs
Hansen, J.E.; Buratti, C.C.; Garciarena, A.D..
Advise on Biologically Allowable Catch (BAC) for Southern Argentine anchovy (Engraulis anchoita, 41° S-48° S) during 2012. To assess the evolution since 1990 and the current status of Argentine anchovy Southern stock, an Age Structured Population Model (ASPM) was used. Modeling of catches according to a four-month period pulses allowed to predict annual yields so as to get them close to the nominal catches officially recorded. Some independent indexes of stock abundance (eight acoustic estimates of total biomass and five estimates of spawning stock biomass obtained with the Daily Egg Production Method) and the proportion of individuals per age group assessed during the same cruises were used to calibrate the fitting. No stock-recruitment function but a...
Tipo: Journal Contribution Palavras-chave: Stock assessment; Yield; Statistical models; Age composition; Clupeoid fisheries.
Ano: 2013 URL: http://hdl.handle.net/1834/5508
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