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イカ釣り集魚灯への水中灯導入の可能性を検討するために長崎県壱岐北部海域において沿岸の小型イカ釣り船に水中灯を装備して漁獲試験を行った。2 隻の同日の漁獲量を比較したところ水中灯船の漁獲量は対照とした船上灯船よりも有意に低くなった。しかし一般化線形モデルの解析では漁獲量は資源量月齢と潮汐イルカの出現風向で説明され水中灯は漁獲に有意な影響を及ぼさなかった。This study examined the possibility of using underwater lamps in coastal squid jigging fishery. Fishing trials were carried out from 2009 to 2011 using coastal squid jigging boats (6.4-6.6 t) equipped with an underwater lamp apparatus with a shade to create high/low light intensity fields in the water column. The catch amounts of the squid jigging boats with the underwater lamp apparatus (experimental boats) were compared with the catch of a control boat equipped with conventional surface lamps, which simultaneously operated in the same water. The catch amounts of the experimental boats were significantly less than that of the control boat (p<0.05). However, catch amounts were expressed as functions of squid abundance, lunar phase, tide, presence of dolphins and wind direction, and the effect of using the underwater lamp apparatus was insignificant in the generalized linear modeling analysis. Thus, the underwater lamps did not increase squid catch, but were considered useful for controlling the depth of squid aggregation by changing the depth of the lamps

Catch performance of coastal squid jigging boats equipped with underwater lamps having a shading structure