Abstract
The author carried out an experiment to find out the response of filefish, Navodon modestus(Gunther) to the colored lights. The experimental tank($360L{\times}50W{\times}55Hcm$) was set up in a dark room. Six longitudinal sections with 60 cm intervals are marked in the tank to observe the location of the fish. Water depth in the tank was kept 50 cm level. Light bulbs of 20W at the both ends of the tank projected the light horizontally into the tank. Two different colored filters were selected from four colors of red, blue, yellow, and white, and they were placed in front of the light bulbs to make different colors of light. Light intensity were controlled by use of auxiliary filters intercepted between the bulb and the filter. The fishes were acclimatized in the dark for 50 minutes before thor were employed in the experiment. Upon turning on the light, the number of fish in each section was counted 40 times in 30 second intervals, and the mean of the number of fish in each section was given as the gathering rate of the fish. The colors favourited by the fish was found in the order of blue, white, yellow and red. The gathering rate of fish on illumination period was not constant but varied randomly. The difference of the gathering rates on two different colors of light was rather in significant, however the difference was larger in the day time than in the night time.
색광에 대한 말쥐치 Navodon modestus의 행동을 조사하기 위하여, 2가지씩의 서로 다른 색광을 조합하여 수조의 양단에서 동시에 광자극을 가했을 때의 반응을 주간과 야간으로 구분 조사한 결과는 다음과 갈다. 1. 수조내에서의 말쥐치의 구간별분포곡선은 양단 구간에 다소 많이 모여 대체로 U 자형이 되었다. 2. 양색선원쪽에서의 평균분포차는 $10.65\%(4.59{\sim}19.16\%)$였고, 주간($13.20\%$)보다 야간($8.09\%$) 에 적었다. 3. 말쥐치가 잘 모이는 색광은 주간과 야간의 구별없이 청색, 백색, 황색, 적색의 순으로 나타났다. 4. 조명시간의 경과에 따른 집어율의 변화는 일정한 증감추세를 보이지 않고 계속 불안정하게 변동했다. 5. 두가지 색광에 대한 집어율의 차는 비교적 뚜렸하지 않았는데 야간보다 주간에 그 차가 심했다.