Bayesian mark-recapture model for migrating fish populations: Ascent of Atlantic salmon (Salmo salar L.) in River Kymijoki and the effects of river discharge and recreational fishing

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By creating a bayesian catch - and release probability model, we estimated the size of river Kymijoki ascending salmon population, and how it was affected by river discharge managed by stream regulation, recreational fishing in the river area and its estuary, and transportation of ascending adult fishes over Korkeakoski dam. Complex study problem and availability of paraller catch- and release - and catch-data give good precusitions for applying bayesian modelling in the study.