FISHWAY ON MIGRATION CHARACTERISTICS OF ANGUILLA JAPONICA BY WATER TEMPERATURE CONDITIONS

Abstract

 Temperature difference may occur between inside of fishway and downstream area of fishway, because exit of fishway are located near surface water of dams or weirs. Since Anguilla japonica is ectothermic organism, water temperature difference between fishway and downstream area have great effect on migration rate. In this study, it examined effects of change in acclimation water temperature and water temperature in fishway on migration characteristics of Anguilla japonica. The results showed that migration challenge and success rate were highest when acclimation water temperature and water temperature in fishway were 20℃ and 25℃. When acclimation water temperature and water temperature in fishway increased, Anguilla japonica became more active and migrated without much rest.