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European eel (Anguilla anguilla): prediction of spawner escapement from continental population parameters

Feunteun, Eric and Acou, Anthony and Laffaille, Pascal and Legault, Antoine European eel (Anguilla anguilla): prediction of spawner escapement from continental population parameters. (2000) Canadian Journal of Fisheries and Aquatic Sciences (CJFAS), vol. 57 (n° 8). ISSN 1205-7533

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Official URL: http://dx.doi.org/10.1139/f00-096

Abstract

This paper describes the assessment of silver European eel (Anguilla anguilla) escapement based on a “sedentary” population fraction analysis in a 60-km2 watershed of northern Brittany (France). Downstream migration fluxes were monitored using eel traps and related to environmental factors. Intensive electrofishing and fyke-net fishing were conducted to assess eel biomass, densities, and population structure. A total of 564 eels, including 81 silver eels, were PIT tagged. In 1996, 616 eels were caught in the catchment including 68 silver eels (11%). During the following downstream migration period, 12 of the PIT-tagged silver eels, among a total of 678, were recaptured in the downstream traps. Seven were recaptured in the catchment in 1997. It was shown that (i) only about 20% of the silver eels present in the catchment emigrated during the following year, (ii) 12% stayed in the catchment including two (3.4%) that recovered yellow eel characteristics, and (iii) the other eels either died or settled in the catchment but were not recaptured. It was also estimated that 2% (650 eels) of the population (34 000 eels) among 3000 silver eels considered “emigration candidates” emigrated each year.

Item Type:Article
Additional Information:Thanks to NRC Research Press. The definitive version is available on : http://www.nrcresearchpress.com/doi/abs/10.1139/f00-096. NRC Research Press' copyright notice is available on : http://www.nrcresearchpress.com/page/authors/information/rights
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Fish-Pass (FRANCE)
Other partners > Université de Rennes 1 (FRANCE)
Laboratory name:
Statistics:download
Deposited By: Pascal LAFFAILLE

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