Special Issue (Global Environment Engineering)Paper
EFFECTS OF BLINK FREQUENCY AND ILLUMINATION ON AVOIDANCE PROPERTIES OF YELLOW-PHASE ANGUILLA JAPONICA
2023 Volume 79 Issue 27 Article ID: 23-27002
Details
2023 Volume 79 Issue 27 Article ID: 23-27002
It has been a problem that fish stray into the water intakes of dams and weirs and are injured. In particular, the depletion of Anguilla japonica and Plecoglossus altivelis, which have a high value in fisheries, is a serious problem that may damage the local economy. Light is one of a methods of inducing repellent behavior of fish. The effects of continuous and blinking light on the avoidance behavior of fishes have been elucidated, but very few studies have been conducted on Anguilla japonica. In this study, the blink frequency of flashing light were changed from 0.3 to 15 Hz and also the illuminance from 60 to 1300 lx using yellow-phase Anguilla japonica in 300 mm total length. It was found that Anguilla japonica avoided the flashing light in the present conditions and also that the repellent characteristics became more pronounced as the blinking frequency and illuminance increased. The range of blink frequency and illuminance must be expanded more than this study, so that the stray rate will be decreased and the population of Anguilla japonica will be increased.
