STOCKINGOF SEATROUT (Salmo truttam. trutta) SMOLTS INPOLAND. PART I. PRELIMINARY ANALYSIS OF TAGGING EXPERIMENTS
Keywords:
RECAPTURE RATES, EARS OF CAPTURE, PLACE OF RELEASE
Abstract
In 135 experiments 183,203 sea trout smolts were tagged and released into the Vistula River system, to the Pomeranian rivers, and to the Bay of Gdańsk in 1961 through 1986. The average result was 127.3 kg of recaptured fish per 1000 of released smolts and the range was from 0 to 1116 kg. The most successful was stocking the sea (mean 251.8 kg), less tagged fish were recaptured from those released into the Vistula system (120.8 kg), and liberating smolts into the Pomeranian rivers appeared to be the least effective (55.9 kg per 1000 smolts). High correlation between recaptures in successive years following release suggests that a short period after stocking determined the overall effects.
