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Registros recuperados: 306
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Estimación preliminar de la mortalidad natural de la merluza de cola (Macruronus magellanicus) en la plataforma sur-patagónica (Argentina) OceanDocs
Ehrhardt, N.M.; Prenski, L.B..
Long-tail hake, Macruronus magellanicus, is an important species in the Argentinean southern demersal species complex. Significant development of these fisheries since 1987 is indicative of the need to assess the hoki resource and for this purpose knowledge about some of the fundamental population parameters, such as natural mortality rate, is required. Knowledge on the natural mortality rate is an important element for the quantification of the resilience of the stock to fishery exploitatuib. In this study an algorithm for estimating natural mortality of hoki is developed which is based on information on abundance at age obtained from area swept methods and from age composition in the landings. As a result, natural mortality rates for ages 5 to 9 ranged...
Tipo: Journal Contribution Palavras-chave: Demersal fisheries; Mortality; Abundance; Demersal fisheries; Mortality; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1996 URL: http://hdl.handle.net/1834/1962
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Análisis de la distribución y dinámica poblacional de lenguados de la Provincia de Buenos Aires (Pisces, Bothidae) OceanDocs
Fabré, N.N..
Los lenguados constituyen un importante recurso pesquero en el Mar Argentino. Más que en los volúmenes desembarcados (9 .731 t en 1991), esta importancia se centra en su elevado valor de comercialización debido a la alta calidad de su carne. Atendiendo a los desembarques totales realizados en el Mercado de Concentración Pesquera de Mar del Plata, los lenguados ocupan el octavo lugar. Estos desembarques están compuestos principalmente por especies de porte mediano a grande pertenecientes al género Paralichthys, y por ejemplares de tamaño mediano o pequeño de las especies Xystreuris rasile, y en menor proporción, Paralichthys isosceles. Este recurso es explotado, en el sector bonaerense, por las flotas de rada o ría y costera, mientras que la flota de altura...
Tipo: Theses and Dissertations Palavras-chave: Geographical distribution; Population dynamics; Population structure; Growth; Reproduction; Mortality; Environmental effects; Ecosystems; Marine fish.
Ano: 1992 URL: http://hdl.handle.net/1834/5158
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Diferencias entre parámetros vitales de las poblaciones bonaerense y patagónica de anchoíta argentina. OceanDocs
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
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Biologie et dynamique des populations d’Anchois (Engraulis encrasicolus) des côtes mauritaniennes. OceanDocs
Ba, I.S..
Résumé: Cette étude traite de la biologie et de la dynamique des populations d’anchois (Engraulis encrasicolus) des côtes mauritaniennes. Après un bref rappel des conditions climatiques et hydrobiologiques de la région, une tentative de mise en évidence de race ou population locale a montré que cette espèce pourrait être rattachée à la population méridionale atlantique du Golfe de Gascogne. En Mauritanie, l’Anchois n’est pêché que de façon accessoire. Les captures les plus abondantes sont réalisées de mai à Septembre essentiellement dans la zone nord où l’on observe un upwelling permanent. Pour évaluer la taille du stock, des estimations de biomasse par échointégration ont été effectuées, mais celles-ci n’ont pas permis de donner un ordre de grandeur...
Tipo: Theses and Dissertations Palavras-chave: Anchovy fisheries; Upwelling; Population dynamics; Mortality.
Ano: 1988 URL: http://hdl.handle.net/1834/676
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Estimación de parámetros poblacionales del efectivo de sardina fueguina (Sprattus fuegensis) de la costa continental Argentina. OceanDocs
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
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Aspectos de la biologia reproductiva de la castaneta (Cheilodactylus bergi) en la zona comun de pesca Argentino-Uruguaya OceanDocs
Wöhler, O.C..
Length and age at first maturity was estimated, and the distribution of the spawning stock of castaneta (Cheilodactylus bergi) was analyzed, with the aim of understanding the spawning activity and its relation with oceanographic parameters. Samples came from two research cruises carried out in the Argentine-Uruguayan Common Fishing Zone (CFZ) (SW Atlantic, between 34 degree and 39 degree 30'S), during the end of spawning period (May-June) of 1991 and 1993. Length at first maturity was estimated in 21.34 cm and 23.69 cm of total length, for males and females respectively. Age at first maturity estimated for sexes combinated corresponding to 2.60 years. A spawning area in the north (between 35 degree and 37 degree S) was determined, showing a high incidence...
Tipo: Journal Contribution Palavras-chave: Fishing grounds; Sexual maturity; Spawning seasons; Mortality; Environmental conditions.
Ano: 1997 URL: http://hdl.handle.net/1834/5795
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Mortality rate, exploitation and recruitment in Oreochromis niloticus (Linnaeus) in Nyanza Gulf of Lake Victoria, Kenya OceanDocs
Getabu, A..
An analysis was done on length frequency data to study mortality, exploitation rate and recruitment in Oreochromis niloticus in Nyanza Gulf, Lake Victoria. The fishing mortality (F) and natural mortality (M) were 0.468 y super(-1) and 2.0 y super(-1) respectively. The exploitation rate was 57.2%. Yield per recruit under the fishing regime was 250 g. Its predicted value at maximum sustained yield was 530 g, which could be obtained at a fishing mortality of 1.5 y super(-1). The recommended value was 500 g to be obtained at a fishing mortality of 1.0 y super(-1). The maximum biomass per recruit (B/R) was 1132.48 g while the optimum was 1068.38 g. The biomass recruit under the present fishing regime is 534.19 g which is...
Tipo: Proceedings Paper Palavras-chave: Oreochromis niloticus; Exploitation; Fishery management; Lake fisheries; Mortality; Fishery management; Lake fisheries; Mortality; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4159; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1994 URL: http://hdl.handle.net/1834/1175
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Variación temporal de la abundancia de huevos y larvas de Engraulis anchoita en el litoral norpatagónico entre enero y abril de 2001. Crecimiento y mortalidad larval OceanDocs
Brown, D.R.; Leonarduzzi, E.; Averbuj, A.; Livore, J.P..
Argentine anchovy (Engraulis anchoita) eggs and larvae abundance distribution patterns in the Argentine northpatagonian littoral during January-April 2001 were analyzed. As the season progressed, a process of decline in the reproductive activity was observed. Larval growth and mortality rates were established. Age determinations were performed analyzing otoliths daily increments. The 0.43 mm day-1 growth rate average did not show space-time differences, fact attributed to the homogeneity of the thermal field. The 0.32 d-1 January natural mortality rate was determined by exponential decline. Mortality rates, estimated with the mortality-aggregation model, were considered dependent on the larval size. The value ranges (d-1) were 0.07-0.49, 0.05-0.61 and...
Tipo: Journal Contribution Palavras-chave: Fish larvae; Growth; Otoliths; Mortality.
Ano: 2013 URL: http://hdl.handle.net/1834/5500
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Evaluación del estado de explotación de la merluza de cola Macruronus magellanicus en la plataforma sur-argentina. OceanDocs
Prenski, L.B.; Ehrhardt, N.M.; Legault, C..
Hoki, Macruronus magellanicus, is an important resource in the Argentinean multispecific southern demersal fishery. The species is distributed South of 46°S between the 50 and 200 meter isobaths. Thesouthern demersal fishery was almost nil prior to 1987, becoming more relevant toward the end of the 1980's. International fleets operating through several fishery agreement were those of the ex-Soviet Union,Bulgaria and Japan. Research on the abundance of hoki resources were initiated in the early 1970's; however, fishery research have been noticeably enhanced since 1992. In this study existing information on the Argentinean hoki fishery is integrated and an assessment of the status of exploitation of the species is carried out.As a result of the analyses, a...
Tipo: Journal Contribution Palavras-chave: Fishery management; Mortality; Abundance; Stock assessment; Gadoid fisheries; Demersal fisheries; Adaptations; Fishery management; Stock assessment; Demersal fisheries; Mortality; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1997 URL: http://hdl.handle.net/1834/1924
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Enfermedades coralinas y su investigación en los arrecifes colombianos OceanDocs
Gil-Agudelo, D.L.; Navas-Camacho, R.; Rodríguez-Ramírez, A.; Reyes-Nivia, M.C.; Bejarano, S.; Garzón-Ferreira, J.; Smith, G.W..
Los arrecifes coralinos, uno de los más bellos e importantes ecosistemas de nuestro planeta, han existido por más de 200 millones de años, sobreviviendo a grandes cambios durante su historia (glaciaciones, extinciones masivas, entre otros). Sin embargo, durante las últimas tres décadas se han registrado grandes y súbitos cambios en el medio marino que a juicio de algunos investigadores ponen en peligro la supervivencia de corales y arrecifes coralinos. Uno de los mayores problemas que enfrentan los arrecifes coralinos hoy en día es la aparición de enfermedades que atacan a los corales, la base de estos ecosistemas. No existe un concenso sobre si estas enfermedades son realmente nuevas o no, pero lo que sí se sabe es que algunas de ellas están creando...
Tipo: Journal Contribution Palavras-chave: Coral reefs; Mortality; Coral reefs; Mortality; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 2009 URL: http://hdl.handle.net/1834/3616
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Aspectos de la biologia reproductiva de la castaneta (Cheilodactylus bergi) en la zona comun de pesca Argentino-Uruguaya OceanDocs
Wöhler, O.C..
Length and age at first maturity was estimated, and the distribution of the spawning stock of castaneta (Cheilodactylus bergi) was analyzed, with the aim of understanding the spawning activity and its relation with oceanographic parameters. Samples came from two research cruises carried out in the Argentine-Uruguayan Common Fishing Zone (CFZ) (SW Atlantic, between 34 degree and 39 degree 30'S), during the end of spawning period (May-June) of 1991 and 1993. Length at first maturity was estimated in 21.34 cm and 23.69 cm of total length, for males and females respectively. Age at first maturity estimated for sexes combinated corresponding to 2.60 years. A spawning area in the north (between 35 degree and 37 degree S) was determined, showing a high incidence...
Tipo: Journal Contribution Palavras-chave: Fishing grounds; Sexual maturity; Spawning seasons; Mortality; Environmental conditions.
Ano: 1997 URL: http://hdl.handle.net/1834/5793
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Estudio de algunos aspectos del ciclo vital de la merluza de cola Macruronus magellanicus, Lonnberg, 1907. OceanDocs
Giussi, A.R..
Long tailed hake Macruronus magellanicus, is a demersal fish,distributed in the SW Atlantic Ocean, in Malvinas Current waters,from 36° and 55°S, mainly between 50m and 200m depth. The species is also distributed in Chilenian waters in the Pacific Ocean, being caught in the Magellan Strait and the Beagle Channel. Age determination was estimated with the sagittae otoliths, in which only one ring is formed during the year. Growth parameters were calculated directly and with back calculated methodology, no differences were observed between the results. Differences in growth sexes were evident from 3 years old. The oldest age observed was 13. Different distributional areas of adults through out the year could suggest a migratory movement in northern waters of...
Tipo: Theses and Dissertations Palavras-chave: Life cycle; Growth; Otoliths; Age determination; Reproduction; Population dynamics; Mortality; Population structure; Fishery surveys; Fishing grounds; Geographical distribution; Back calculation; Growth; Otoliths; Age determination; Population structure; Geographical distribution; Life cycle; Reproduction; Population dynamics; Mortality; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1996 URL: http://hdl.handle.net/1834/1488
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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 OceanDocs
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
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Varamiento de cachalotes (Physeter macrocephalus) (Cetacea: Physeteridae) en la costa ecuatoriana por interacción con pesquerías OceanDocs
Haase, B.; Félix, F..
El objetivo del presente trabajo es dar a conocer los varamientos de cachalotes en la costa ecuatoriana y mostrar que en algunos casos tales hechos tuvieron una relación directa con actividades pesqueras.
Tipo: Journal Contribution Palavras-chave: Marine mammals; Protected resources; Stranding; Mortality; By catch; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1996 URL: http://hdl.handle.net/1834/2192
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Análisis del crecimiento y la mortalidad de Anisotremus interruptus (Gill) (Perciformes: Haemulidae) en la Costa de Colima, México OceanDocs
Espino-Barr, E.; Gallardo-Cabello, M.; González-Orozco, F..
This paper deals with the growth and mortality analysis of the burrito grunt Anisotremus interruptus on the coast of Colima, México. The estimated growth parameters are: L ¥ = 50.59 cm; W ¥ = 5,051.04 g; k = 0.147 years-1; to = -0.916 years; A0.95 = 19.46 years. Most of the growth occurred during the first year of life, when the grunt grows 12.52 cm, the second year it grows 4.95 cm and the third, 4.60 cm. The highest value of the condition index took place between February and September. The total mortality rate (Z) was calculated as 0.53 years-1. These values are basic for the plan of administration of the fishery of this species.
Tipo: Journal Contribution Palavras-chave: Growth; Mortality; Growth; Mortality; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 2004 URL: http://hdl.handle.net/1834/3060
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Comparación temporal en la estructura de una comunidad coralina en primeros estados de sucesión, Isla de San Andrés, Colombia OceanDocs
Jaramillo-González, J.; Acosta, A..
Los arrecifes coralinos del mundo han sufrido un declive durante las pasadas tres décadas. Estos cambios se han evaluado en arrecifes en franja; sin embargo, se desconoce si los tensores causantes de dichos cambios afectan la dinámica de una comunidad coralina en los primeros estados de la sucesión antes del desarrollo de un arrecife. Para resolver este interrogante, se monitoreó durante 2004, 2005 y 2006 una comuniddad coralina aislada en San Andrés. Se compararon temporalmente la abundancia, cobertura y mortalidad parcial sufrida por la comjnidad coralina y sus poblaciones de coral dominantes. La comunidad coralina no presentó variación estadística en riqueza, abundancia, cobertura, ni en área de mortalidad parcial. Sin embargo, esta comunidad si varió...
Tipo: Journal Contribution Palavras-chave: Coral; Dynamics; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 2009 URL: http://hdl.handle.net/1834/3605
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Recomendaciones para el manejo y explotación del recurso pesquero de merluza común (Merluccius hubbsi) del Golfo San Matías durante el año 1999 OceanDocs
González, R.A.; Morsan, E.M..
En este informe se aborda el análisis del estado de conservación del efectivo pesquero de merluza común (Merluccius hubbsi) del Golfo San Matías a partir de la aplicación de métodos del tipo analítico (Análisis de Cohorte). A partir de este diagnóstico (estimaciones de las tasas de mortalidad por pesca anual y del número de reclutas retrocalculado para el año 1998), se realizan proyecciones del rendimiento en peso del stock, de la biomasa total y del rendimiento en términos económicos, aplicando para ello una versión del Análisis de Rendimiento por Recluta
Tipo: Report Palavras-chave: Fishery management; Stock assessment; Yield/recruit; Recruitment; Mortality; Economic feasibility; Fishery management; Stock assessment; Mortality; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999 URL: http://hdl.handle.net/1834/3721
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Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) OceanDocs
Pappalardo, M.P.; Morsan, E.M..
In this study we analyze growth, mortality and estimated biomass trend of purple clam, Amiantis purpurata, population placed in Playa Villarino, (Northern San Matias gulf, Argentina) in the southern most boundary of its geographical distribution. Previously, the population structure was described composed by three consecutive cohorts settled among 1978-1980, and the individual growth rate showed high spatial variability. The hypothesis to test in this study is that growth rate is regulated by local biomass. We choice four sites with different densities, to assess growth rate, natural mortality and retrospective estimated biomass trend. During February 2003, densities and growth rate (using external growth bands measurements) were analyzed matching with a...
Tipo: Journal Contribution Palavras-chave: Growth rate; Clam fisheries; Mortality; Growth curves; Density dependence; Biomass; Growth; Biomass.
Ano: 2005 URL: http://hdl.handle.net/1834/4385
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Patrones de distribución espacio-temporal de los estadíos embrionarios y larvales de la anchoíta (Engraulis anchoita Hubbs & Marini) a micro y macro-escala. Su relación con la supervivencia OceanDocs
Sánchez, R.P..
This dissertation is focused on the study of implications of spatial patterns on survival of eggs and larvae and subsequent recruitment of the SW Atlantic anchovy, Engraulis anchoita. The study of distribution patterns is encompassed within the conceptual framework of the analysis of reproductive strategies of marine bony fish, as adaptations that enable them to cope with and actively exploit environmental variability, regulating their abundance and avoiding extinction. The SW Atlantic anchovy, is ideally suitable for studies on reproductive biology and recruitment on a comparative basis. Its spawning and nursery grounds are located in very diverse ecosystems. This variety refers to their physico-chemical properties, carrying capacity, the influence of...
Tipo: Theses and Dissertations Palavras-chave: Fish eggs; Fish larvae; Recruitment; Ichthyoplankton; Biomass; Reproduction; Developmental stages; Mortality; Stock assessment; Environmental conditions; Biomass; Developmental stages; Stock assessment; Fish larvae; Reproduction; Mortality; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2230; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 1995 URL: http://hdl.handle.net/1834/1491
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Dynamique de la population de Sandre Stizostedion Lucioperca OceanDocs
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
Registros recuperados: 306
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