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Media type:
E-Article
Title:
Sea migration pattern of two sea trout (Salmo trutta) stocks released into the Gulf of Finland
Contributor:
Kallio-Nyberg, Irma;
Saura, Ari;
Ahlfors, Pekka
Published:
Finnish Zoological and Botanical Publishing Board, 2002
Published in:
Annales Zoologici Fennici, 39 (2002) 3, Seite 221-235
Language:
English
ISSN:
0003-455X;
1797-2450
Origination:
Footnote:
Description:
The sea migration of two sea trout stocks was examined in a tagging and transplantation experiment. The two different stocks, which originated from the rivers Isojoki (Gulf of Bothnia) and Ingarskilanjoki (Gulf of Finland), were released in 1994—1996 as smolts (3991 and 3996 smolts) at two nearby sites in the Gulf of Finland. The tag recovery data received 5—19 months after release (Sep.—Nov.) from the Gulf of Finland were analysed. The recovery rate was about 8%. Multi-way contingency analysis showed that the origin of the stock affected the spatial and temporal sea distribution. The majority (63%) of the Ingarskilanjoki sea trout, but a smaller proportion (49%) of the Isojoki sea trout, were caught in coastal waters, near the release site. The stock-specific spatial sea distributions were not affected by the gear types used. The genetic threats of stocking are discussed.