| Popis: |
For better understanding the capture process of Pacific saury in light fishing, the histological examination of the retina was conducted us??ing gill net with attracting lamp to investigate the retinomotor response for the light adaptation process according to the time elapsed. In the field experiment, 35 specimens of fish were collected with the different lighting time elapsed (5J5,30.45,60,9(),& 150 min) for monitoring the cone index to show the initial response started within 5min and then fully light-adapted between 9()-IM)min. The laboratory experiment was conducted for detail monitoring of the retinomotor response with the different light intensities (0.28, 3.39 & 6.96 ??W/cm/nm) for 24 spec??imens and different lighting colours (Blue_ 47()nm, Green_ 530nm, & Red_ 620nm) for 48 specimens, according to the lighting times (5,10,15.2(),30,40,45,6075,& 90 min). Under the lower light intensity, the light adaptation process show the similar pattern to that observed in the field experiment, where the single cone was more sensitive to the light than the double cone. The cone sensitivity to the colour light was also examined to identify the different light adaptation process in rela??tion to the lighting sources for fishing lamp. |
