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Master Thesis

Étude du comportement des smolts de saumons atlantiques (Salmo salar) au droit de la retenue de Poutès (Allier) à l'aide de la télémétrie 2D

Abstract : On the Loire-Allier system, the Atlantic salmon smolts (Salmo salar) have to travel through more than 900 km from their growth habitat to enter the ocean. All along their downstream migration, they encounter disruptions of connectivity such as dams and weirs. Poutes dam is on the Allier River at 860 km upstream the estuary. Even if it is equipped with upstream and downstream migration devices, delays in downstream migration remain. In 2013 and 2014, a study about the downstream migration using rotative screw trap upstream Poutes headpond showed that peaks of smolts occur in March whereas the smolts have not been recorded in the bypass until mid-April. Downstream migration is studied here, from upstream Poutes headpond until smolts arrival in the bypass stretch. To be more specific their behavior in the headpond and near the dam is studied. A hundred wild smolts have been followed using acoustic telemetry (with JSAT technology) which allows a 2D positioning. Data show that the dam induces to a delay (transit in the headpond lasts 9.3 days) which can be explained by an hesitation to use the bypass and by a desorientation in the headpond (several attempts to pass through dam and back and forth until the end of the headpond). Data also highlight a seasonal effect in smolts behavior. Around mid-April a change in juvenile behavior is observed: they seem to first move downstream passively and then become active.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-01256599
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Submitted on : Friday, January 15, 2016 - 9:44:48 AM
Last modification on : Monday, July 6, 2020 - 3:38:21 PM
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Marine Lemaire. Étude du comportement des smolts de saumons atlantiques (Salmo salar) au droit de la retenue de Poutès (Allier) à l'aide de la télémétrie 2D. Sciences du Vivant [q-bio]. 2015. ⟨dumas-01256599⟩

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