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Physiological responses of seven lacustrine fish species to capture stress gill net and landing net Reponses physiologiques de sept especes de poissons lacustres a un stress de capture filet maillant et epuisette


, : Physiological responses of seven lacustrine fish species to capture stress gill net and landing net Reponses physiologiques de sept especes de poissons lacustres a un stress de capture filet maillant et epuisette. Bulletin Francais de la Peche et de la Pisciculture, 357-360: 157-168

The potential physiological disturbances experienced by fish as a result of capture with gill nets or landing nets were assessed in pike, pikeperch, perch, bream, chub, carp and tench from the hydroelectric reservoir of Pareloup (Aveyron). Capture of fish quickly resulted in both a significant elevation of plasma catecholamine ( > 10 ng.ml-1), cortisol ( > 100 ng.ml-1) and glucose ( > 1 g.l-1) levels and a drop in plasma thyroid hormone levels ( < 20 ng.ml-1) in all species. These physiological stress responses were found to be highly increased following gill-netting, especially in carnivorous species. Hence, these data suggest that the use of gill nets is rather inadequate for short-term researches on blood physiology of feral fish populations, then attesting to the necessity of settling up experimental facilities (e.g., fish-ponds, floating coops, etc.) following gill-netting to ensure a complete recovery of fish from capture stress.

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