Response of Yoroi-Mebaru,Sebastes hubbsi to the Underwater Attracting Lamp

수중유도등에 대한 우럭볼락의 반응

  • 양용림
  • Published : 1998.09.01

Abstract

The author examined the response of Yoroi-mebaru, Sebastes hubbsi [MATSUBARA] to the underwater attracting lamps (0.5 W, 0.8 W, 1 W) line in the experimental water tank (550 L x 58 W x 73 H cm). The attracting rate investigated in accordance with the intervals of lighting and putting out hour (1, 5 minutes) when each of the underwater attracting lamps was gradually switched off after they were switched on all at once. The results are a follows: 1. Distribution rates of fish in the illuminated area was 35.7 % in case of 1 minute interval, and 50.3 % in case of 5 minutes interval. 2. Mean distribution rate of fish at the illuminated section: \circled1 Distribution rates at interval of 1 minute were 9.8 % in 1 W, 6.5 % in 0.8 W and 5.1 % in 0.5 W, respectively. \circled2 Distribution rates at interval of 5 minutes were 15.6 % in 1 W, 8.5 % in 0.5 W and 6.1 % in 0.8 W, respectively. 3. Attracting rates of the last section showed a little increasing as illuminating time elapsed. A difference of attracting rates according to lighting source in 5 minutes interval were bigger than that in 1 minute interval. 4. Attracting rates of fish in only last section switched on: \circled1 Attracting rates at interval in case of 1 minute were 30.0 % in 0.8 W, 16.0 % in 1 W and 8.0 % in 0.5 W, respectively. \circled2 Attracting rates at interval in case of 5 minutes were 56.0 % in 1 W, 30.7 % in 0.5 W and 10.7 % in 0.8 W. respectively.

Keywords

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