Substrate Preferences of Brown Trout Fry (Salmo trutta) m Artificial Stream Channels

Author: Jan Heggenes
Publication: Canadian Journal of Fisheries and Aquatic Sciences
October 1988

Abstract

Brown trout fry (Salmo trutta) of two sizes (43 and 32 mm mean total length) preferred the coarsest gravel when allowed to choose between three sizes (8–16, 20–30, and 50–70 mm) at two temperatures (12.9–18.1 and 6.0–6.9 °C) in artificial stream channels. Fry hid more in the substrate in daytime than at night and in daytime also hid more at low temperatures than at high temperatures. Increasing the average water velocity from 4 to 14 cm∙s−1 displaced the 43-mm fry slightly downstream at night. The 32-mm fry showed a weaker preference for the coarse substrate and, in general, had less pronounced diurnal substrate preferences.

Résumé

Des alevins de truite brune (Salmo trutta) de deux tailles (43 et 32 mm de longueur totale moyenne) préféraient le gravier plus grossier lorsqu'ils pouvaient choisir entre trois granulométries différentes (8–16, 20–30 et 50–70 mm) à deux températures (12,9–18,1 °C et 6,0–6,9 °C) dans des chenaux de cours d'eau artificiel. Ils se dissimulaient davantage dans le substrat pendant le jour que pendant la nuit, et pendant le jour ils se dissimulaient davantage à basse température qu'à température élevée. Les alevins de 43 mm étaient légèrement déplacés en aval la nuit lorsque la vitesse moyenne de l'eau passait de 4 à 14 cm∙s−1. Les alevins de 32 mm présentaient une préférence moins marquée pour le substrat grossier, et en général leurs préférences diurnes du substrat étaient moins marquées.

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cover image Canadian Journal of Fisheries and Aquatic Sciences
Canadian Journal of Fisheries and Aquatic Sciences
Volume 45Number 10October 1988
Pages: 1801 - 1806

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Published online: 11 April 2011

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