1983 Volume 49 Issue 12 Pages 1819-1824
The purposes of the present study are to make clear the effectiveness of two types of artificial bait in the bottom long-line fishing: (1) scented artificial bait serving as olfactory stimuli to fishes; (2) fluorescent artificial bait serving as visual stimuli to fishes. The artificial bait is spongy and made of urethane chemicals.
In order to examine the effectiveness of the artificial bait mentioned above, the bottom longlines were set on the sea floors (220 to 850m in depth) of the Kumano-nada along the Pacific coast of central Japan.
Total number of 2940 baited hooks were used. These were classified into five groups: (1) hooks baited with sliced squid; (2) hooks with sliced squid plus scented and fluorescent artificial bait; (3) hooks with silced squid plus fluorescent artificial bait; (4) hooks with sliced squid plus scented artificial bait; (5) hooks with scented and fluorescent artificial bait. Then, difference among the fish numbers caught in each groups of the baited hooks were examined by X2 test.
It was indicated that addition of the artificial bait to the sliced squid was a promising method for obtaining higher fishing rate in the bottom long-line fishing.
