Spawning migration of sea trout ( Salmo trutta (L)) in a Danish river

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From September to November in 1995 a total of 49 mature sea trout were caught and radio tagged in the estuary (Randers fjord) or at the river mouth of the River Gudena in Eastern Jutland. The tagged trout were between 2 and 6 yr old with total body length of 56-85 cm. Twenty-five of the tagged trout ascended the river. They were tracked every third day, for up to six months, until death or descent. Great variation was found in migration pattern and duration of river residence. Some fish spawned and left the river, some died after spawning, while others died unspent. The sea trout preferred to stay on the southern side of the main river, and Males spent significantly more time of the freshwater stay in spawning tributaries than females. Most of the trout ascended the main spawning tributary, the River Lillea, where none passed a weir, 2 km upstream the confluence, despite the presence of a fish ladder
Original languageEnglish
Pages (from-to)275-281
Publication statusPublished - 1998


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