Influence of pre‐stocking feeding levels on catchability of rainbow trout,Oncorhynchus mykiss(Walbaum), in a small fishery

摘要

Abstract.The effects of different pre‐stocking feeding levels on the subsequent catchability of rainbow trout, Oncorhynchus mykiss (Walbaum), were investigated in a 12‐ha put‐and‐take fishery. Two sibling batches of Winthrop strain were fed high or low rations of a pelleted diet to produce similar sized, but recently fast‐ and slow‐growing fish. Each batch was given a distinctive dye mark. Anglers’catch records showed that although the 'slow‐growing’fish were significantly the more easy to catch during the first week after stocking, over the remaining 5 months of the fishing season there was little difference in catchability between batches. This suggests that previous observations of sustained between‐strain differences were not the result of selection of fast‐ and slow‐growing fish per se, but were probably