EFFECTS OF RAPID WATER TEMPERATURE CHANGES IN STATIC WATER ON SWIMMING BEHAVIOR OF ISOLATED OPSARIICHTHYS PLATYPUS

Abstract

 Fish has body temperature synchronized with the surrounding water temperature. Several studies have reported that some fish are killed by cold water caused by the rapid shutdown of industrial wastewater. It was known that rapid water temperature changes have a large effect on swimming behavior of fish. However, the swimming behavior under the condition of rapid water temperature changes has not been investigated so many. In this study, an investigation on swimming behavior of Opsariichthys platypus under the condition of rapid water temperature changes was conducted. It was found that the tailbeat frequency, swimming distance and swimming speed increases with an increase of surrounding water temperature as compared with the acclimation temperature. Further, it was suggested that fish feels fear and increases swimming speed when fish meet 10℃ high temperature water than the acclimation temperature.