Migration pattern of two salmon stocks in the Baltic Sea

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Abstract
Tagging and transplantation experiments were performed to elucidate the distance travelled in the sea by two salmon stocks. River Iijoki salmon were caught at a greater distance from the release point (median in three age groups: 700, 520 and 150 km) than River Neva salmon (median: 90, 80 and 40 km), both stocks being released at the same place in the Bothnian Sea. The Iijoki salmon migrated to the Main Basin to feed, but the Neva salmon stayed and fed near the point of release. The length of migration was also compared in salmon of the same stock released in different places. Tagging experiments revealed that the Iijoki salmon had a long feeding migration distance and the Neva salmon a short one, regardless of the release point. The point of release greatly affected the possibility of finding good feeding areas and thus influenced the growth rate and average yield from the releases. The pattern of migration at sea is a stock-specific trait and has great importance in the result of stocking.

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