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Article Dans Une Revue Canadian Journal of Fisheries and Aquatic Sciences Année : 2000

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

Résumé

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.
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Dates et versions

hal-00735979 , version 1 (27-09-2012)

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Eric Feunteun, Anthony Acou, Pascal Laffaille, Antoine Legault. European eel (Anguilla anguilla): prediction of spawner escapement from continental population parameters. Canadian Journal of Fisheries and Aquatic Sciences, 2000, vol. 57, ⟨10.1139/f00-096⟩. ⟨hal-00735979⟩
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