抄録
Tracking for fish movements of sea breams (Chrysophrys major) and halibuts (Paralichthys olivaceus) tagging with the pinger were carried out as locating by ultrasonic receiver and positioning by GPS in Tongyoung Coast, Korea. Mean moving speed and directions for an interval of 6min by the sea bream might be related with the tidal current and higher than those by the halibut. However, their variations in unit time were irregular and complex to show a nonlinear phenomenon. Therefore, movement components such as acceleration of speed and angular velocity can be modelled using chaotic equation of Lorenz in relation to light, tidal current, temperature etc.
