Coastal Migration and Survival of Juvenile Chum Salmon Estimated from Laboratory Analysis their Maximum Sustainable Swimming Speed

摘要

Chum and pink salmon migrate to the sea during their early juvenile stages. Previously, it was believed that Japanese chum salmon juveniles migrate east along the sub-arctic boundary (Yonemori 1975). However, recent investigations involving the recapture of otolith marked fish (Ueno 1998; Urawa et al. 2004) and genetic stock identification (Urawa et al. 2001) revealed that Japanese chum salmon juveniles migrate to the Okhotsk Sea. When migrating to the Okhotsk Sea, the swimming performance of tjuveniles may be important. In this study, water velocity was adjusted in a circulating tank (SOC-10, Japan Aqua Tech Co. Ltd.) and the effect on swimming performance of chum salmon juveniles was observed. The swimming chamber was 600 mm long × 300 mm wide × 330 mm deep (Fig. 1).