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ESTIMATING THE STOCKOF GLASS EELS IN ANESTUARY BYMARK-RECAPTUREEXPERIMENTS USINGVITAL DYES Cédric BriandD. FatinÉric Feunteun2005 год

ESTIMATING THE STOCK OF GLASS EELS IN AN ESTUARY BY MARK-RECAPTURE EXPERIMENTS USING VITAL DYES
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Аннотация: Glass eels (Anguilla anguilla) arriving after the fishing season in the Vilaine estuary (France) were caught by boat and at a trapping ladder located at a blocking dam upstream in the estuary. They were marked with Bismarck brown, rhodamine B or neutral red, and released into the estuary. The effect of marking on behaviour, mortality and recapture differed according to the dye and concentration used. The glass eels also differed in response to marking according to their origin. Estuarine glass eels were clearly desynchronized in their selective tidal stream transport and left the release area after a few tidal cycles. Trapped glass eels were less sensitive to marking. They remained in the release area and were recaptured in larger number both in the trapping ladder and in the estuary. These results supported a model of two behavioral fractions in the estuary: flow-carried migrants and active glass eels with stronger rheotactic behaviour. The proportion of active glass eels in the estuary shifted from none for the two weeks after the fishery closure, to 10% value of the total stock. At the trapping ladder, the migration ended in June each year, while a large stock was still present in the estuary. These observations favour the interpretation of a short duration of the active phase at this site followed by the transition towards a more benthic behavior. The daily efficiency of the trapping ladder was calculated as 4% of the active stock from both stock estimations and average recapture rate. This value was consistent with the low annual efficiency of the trapping ladder, calculated as 30% of the estuarine stock of glass eels that arrived after the fishing season.
Год издания: 2005
Авторы: Cédric Briand, D. Fatin, Éric Feunteun, Guy Fontenelle
Издательство: EDP Sciences
Источник: Bulletin Français de la Pêche et de la Pisciculture
Ключевые слова: Reproductive biology and impacts on aquatic species, Aquaculture Nutrition and Growth, Sperm and Testicular Function
Другие ссылки: Bulletin Français de la Pêche et de la Pisciculture (PDF)
Bulletin Français de la Pêche et de la Pisciculture (HTML)
Springer Link (Chiba Institute of Technology) (HTML)