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| Desprez, M; Ducrotoy, J; Elkaim, B. |
| In this paper, the results collected since 1978 on the cockle (Cerastoderma edule) in the Bay of Somme have been recapitulated. A synthesis is brought up about causes of the bivalve population collapse which was portended as early as 1982 from the animal cinetics study. In order to back up the discussion, the main results dealing with the biology and ecology of the species are recalled in illustrated form. A review of the international literature leads to a comment upon the diagrams. A comparison with data from European estuaries tends to take climatic and oceanic disturbances into account as well as local pollution such as eutrophication which is probable on the littoral of Picardy. |
| Tipo: Text |
Palavras-chave: Clam fisheries; Stock assessment; Recruitment; Population dynamics; Marine mollusks. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/publication-1783.pdf |
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| Ducrotoy, J; Desprez, M; Elkaim, B. |
| The recent collapse in the landings of cockles (Cerastoderma edule) from the Bay of Somme (France) required to investigate if a change in the environmental factors was liable for the drop of the bivalve populations. This project has led to a preliminary assessment of the situation and has been drawn up from the data collected by the Groupe d'Etude des Milieux Estuariens et Littoraux since 1978. It relies on the survey of the spatio-temporal changes of bio-facies. it is suggested that the impact of changes in sediment characteristics is important as well as competition with species as Pygospio elegans (Polychaeta). The above parameters are assessed as essential in the fluctuations of the cockle numbers but they do not explain entirely the collapse in the... |
| Tipo: Text |
Palavras-chave: Landing statistics; Clam fisheries; Stock assessment; Population dynamics; Marine mollusks. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/publication-1784.pdf |
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| Morsan, E.. |
| The purple clam, Amiantis purpurata, inhabits the warm-temperate waters of the southwestern Atlantic, from Espírito Santo (Brazil) to the San Matías Gulf (Argentina). There are no previous studies dealing with its biology and populations dynamics. Astock located in Playa Villarino (San Antonio Este, San Matías Gulf) supports the only artisanal fishery targeting this species. Some peculiar aspects of its dynamics revealed by this study have significant implications for management: 1. It constitutes the southernmost population of this species, and appears to be isolated from other populations located to the north 2. Individuals are slow-growing 3. It seems to be composed of just one or a few annual classes, which are older than 10 years . 4. The spatial... |
| Tipo: Theses and Dissertations |
Palavras-chave: Population dynamics; Artisanal fishing; Fishery biology; Clam fisheries; Fishery resources; Resource exploitation. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/5034 |
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| Coller, M.; Osovnikar, P.; Narvarte, M.; Perier, R.; González, R.A.; Di Giácomo, E.; Morsan, E.M.; Braicovich, P.; Curtolo, L.; Ocampo, M.. |
| Se realiza una sinopsis del estado de situación de los recursos pesqueros del Golfo San Matías, de sus pesquerías y especies asociadas a las mismas y del ecosistema marino. El objetivo de este informe es presentar información histórica y actualizada sobre los recursos pesqueros y las pesquerías marinas de Río Negro, a los fines de su empleo como guía de análisis para la evaluación de las mismas con vistas a la potencial certificación de una gestión sustentable de las mismas a partir de los estándares del Marine Stewardship Council (MSC). Se presenta información sobre la organización y estructura del sector institucional y del marco legal en el que se desarrolla la actividad. Se desarrolla una caracterización de las pesquerías a partir de diferentes... |
| Tipo: Report |
Palavras-chave: Fishery resources; Fishery management; Clam fisheries; Coastal fisheries; Biodiversity; Environments; Associated species; Yield; Potential yield; Fishery regulations; Certification; Standards; Sustainability; Fishing fleet; Fishery management; Certification; Fishery resources; Coastal fisheries; Biodiversity; Sustainability. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/3719 |
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| 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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