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The spawning stock of migratory sea trout in the Drwęca River was investigated 20 years after the Vistula River was dammed near Włocławek (1968). Fish scales and data were obtained from fish traps and anglers fishing in the lower Drwęca River. The age structure of sea trout which enter the Drwęca River to spawn and the percentage of them which are repeat spawners are presented taking into consideration...
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