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Abstract :
[en] This study describes the mobility patterns of two trout (Salmo trutta L.) of different morphotypes (one typical brown trout and one intermediate between the sea and brown trout) telemetred during 172 consecutive days in the River Meuse Basin (Belgian Ardennes).
The two trout behaved quite differently. The typical brown trout showed little mobility (home range < 1.1 km and longest net daily journey of 850 m) and a constant fidelity to a main area. The other trout was highly mobile (home range extending over 46 km, with net daily journeys as long as 14 km) with no apparent attachment to any particular residence.
These results further question the colloquial belief that all freshwater trout are resident fish and support the idea that different ecotypes (i.e. stream and large river trout) would coexist in the same hydroecosystem. Due to small sample size, it is not permitted to affirm that these ecotypes would be associated to different morphotypes.