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Fluctuations des captures de civelles (Anguilla Anguilla L.) et analyse de la variation de leur capturabilité dans l'estuaire de l'Adour ArchiMer
De Casamajor, Marie-noelle; Bru, N.; Prouzet, Patrick.
Analysis of glass eels catches from 1927 to 1998 in the Adour estuary showed different periods of successive decrease. Fishing periods between 1985 to 1993 were studied iwn order to observe impact of hydroclimatic conditions on the level of catch per unit of effort. This study took place in January when glass eels accessibility by the fishery was generally the highest. With hand and trawl netting that filtered the upper part of the water column, only individuals located close to the surface were accessible. Consequently, factors acting on the migration of glass eels in the water column have a great importance on the fishing success. Among environmental conditions, moon phase and temperature influence were determinant factors on catch variability but a lack...
Tipo: Text Palavras-chave: Capturabilité; Civelle; Estuaire de l'Adour; Phase lunaire; Catchability; Glass eels; Migratory behaviour; Adour estuary.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00480/59145/61773.pdf
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Identification des flux de civelles (Anguilla anguilla) à partir des relations d’allométrie en fonction des conditions hydrodynamiques de l’estuaire de l’Adour ArchiMer
De Casamajor, Marie-noelle; Prouzet, Patrick; Lazure, Pascal.
Biological data on glass eels (Anguilla anguilla) were collected during two successive sampling periods from November to March (1996-1997 and 1997-1998) on the Adour estuary. As for other estuaries, decrease in length (mean of 73.5 to 67.4 mm) and weight (mean of 3.5 to 2.6 dg) of glass eels were observed. Weight and length characteristics were used to identify groups of glass eels. These groups were well distinguished during the first sampling period but some overlaps appeared in the second one. Fluctuations of static allometry and similarity coefficients showed successive glass eels arrivals in the lower part of the estuary during the two seasons. We used fluctuations of the index of similarity in the second period to describe arrivals of glass-eels...
Tipo: Text Palavras-chave: Biométrie; Modèle hydrodynamique; Flux migratoires; Civelle; Estuaire de l’Adour; Biometry; Hydrodynamic model; Migratory flow; Glass-eels; Adour estuary.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00188/29897/28346.pdf
Registros recuperados: 2
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