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| Registros recuperados: 173 | |
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| Perrotta, R.G.; Hernandez, D.R.. |
| Bluemouth (Helicolenus dactylopterus), a benthic fish mostly inhabiting at depths between 500 m and 600 m, represents a highly valuable economic resource for local fishermen at the Azores Islands (NE Atlantic). Nominal catches of bluemouth increased from 1990 through 1994, and declined afterwards reaching in 1999 the lowest value recorded. Standardized catch per unit effort (CPUE) was used as an index for stock relative abundance; a General Linear Model, considering several factors that may have affected the fishing efficiency of commercial vessels, was run to obtain this CPUE index. These factors were: fleet type, year, month, and boat size; the last three factors were found to be statistically significant. A discrete version of the Schaefers Biomass... |
| Tipo: Journal Contribution |
Palavras-chave: Stock assessment; Catch/effort; Risks; Mathematical models; Stock assessment; Mathematical models; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_24199. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1563 |
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| de Moussac, G.. |
| Le present rapport resume et synthetise les donnees des principales publications concernant la biologie des peches artisanales aux Seychelles, depuis 1912, en particulier les rapports des prospections et de statistiques de peche. Une premiere partie presente les donnes biologiques acquises aux Seychelles {sensu strioto) sur quelques 58 especes de poissons. Certains resultats non publies (principalement proposes par l'auteur) sont egalement inclus dans ce chapitre. La seconde partie traite des donnes biologiques sur les ressources marines vivantes, autre que les poissons, a savoir les crustaces, les coquillages et les algues. Le troisieme chapitre resume les resultats concernant les quantifications des... |
| Tipo: Report |
Palavras-chave: Finfish fisheries; Fishery statistics; Population dynamics; Biological data; Stock assessment; Shellfish fisheries; Oyster fisheries. |
| Ano: 1988 |
URL: http://hdl.handle.net/1834/5126 |
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| Mesnil, Benoit. |
| The Catch-Survey Analysis (CSA) method of assessment aims at estimating stock abundance from relative indices by filtering measurement error in the latter through a simple two-stage population dynamics model. The method is not widely used and the associated literature is still limited. The objective of this work is to improve current understanding of the properties of the method, using data generated from a known fully age-structured population. A sensitivity analysis confirms that CSA is capable of providing reliable information about general stock trends. However, absolute estimates are sensitive to the parameter relating survey catchabilities of the two stages, which needs to be estimated externally with methods that warrant further validation. Biased... |
| Tipo: Text |
Palavras-chave: Data limited environments; Collie Sissenwine model; Catch Survey Analysis; Stock assessment. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-439.pdf |
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| Bacher, Cedric; Chai, Ai-ling; Goulletquer, Philippe. |
| The krlging technique Is now employed ln more and more fields: mlnlng (Journel. 1977), hydrology (Delhomme, 197B; Shamsi et al" 1988; Dingman et al" 1988), fishery (Conan, 1989) and ecology (Robertson, 1987; Schotzko and O'Keeffe, 1989, 1990). Recent developments of the mathematlcal theory tend to extend the number of applications where Il may be used. Baslcally defined for the case of a statlonary spatial process, It now encompasses more general processes assuming less and less strong hypotheses (Intrinsic hypothesls, Intrlnsic generalised hypothesis, disjunctive krlglng). In its most general formulation, it allows to study the spatial structure of a process including large scale or local trends. The basic idea remains to take Into account the spatial... |
| Tipo: Text |
Palavras-chave: Kringing technique; Stock assessment; Oysters; Crassostrea virginica; Chesapeake Bay. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00200/31110/29518.pdf |
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| Registros recuperados: 173 | |
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