Effect of the bottom conditions of fishing grounds on the cuttlefish basket trap for golden cuttlefish Sepia esculenta in the Shimabara Sound the north-west of Kyushu Japan
1998
"Yamaguchi, Y. (Nagasaki Univ. (Japan). Faculty of Fisheries) | Yamane, T. "
In the present study we examined the effect of the bottom condition of fishing grounds on the cuttlefish basket trap. To evaluate which fishing grounds is superior for cuttlefish basket trap we calculated CPUE (kg/trap/day) at two different fishing grounds (off Ariake Town fishing ground and off Fukae Town fishing ground) in Shimabara Sound in 1996. We carried out the sediment analysis of the bottom samples collected by SM-grab (0.05 square m) in each fishing ground. The Mdp of off Ariake and off Fukae were -0. 3 to 3.0 and 1.0 to 1.5 which were limited range against the whole Shimabara Sound (_\ 5. 4 to 5.6). In addition off Fukae is narrower than off Ariake and the sediment type of off Fukae is medium sand suggesting that bait density of former fishing ground is higher than later fishing ground. In fact CPUE of off Fukae Town fishing ground (0.46) was 2-fold greater than that of off Ariake Town fishing ground (0. 23). The significance of differences in CPUE between two fishing grounds was verified by taken together Mann-Whitney test (p<0. 05). These results suggest that the medium sandy sea bottom is more preferable for capturing of golden cuttlefish by the cuttlefish basket trap.
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