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在若狭湾西部海域,以真鲷、日本方头鱼和乌贼等高级鱼为渔获对象的延绳钓渔业,是重要的沿岸渔业之一。这种延绳钓利用虾拖网捕获的脊赤虾(Metapenaeopsis acclivis)做为饵料。但是,最近脊赤虾的渔获量处于减少的趋势,意味着其资源量可能变少。根据渔获量来实际推测资源量,其渔具的渔获效率显然是重要的。为了探明虾拖网的渔获效率,就渔获对象脊赤虾,调查了由拖网时间长短产生的渔获尾数的变化、
In the western part of Wakasa Bay, longline fisheries targeting high-grade fish such as red sea bream, Japanese snapper and squid are among the major coastal fisheries. This longline uses bait of Metapenaeopsis acclivis captured by shrimp trawls. However, the recent decline in the number of chick chicks is likely to result in a reduction of its resources. According to the amount of catches to actually estimate the amount of resources, the fishing gear fishing efficiency is clearly important. In order to find out the fishing efficiency of shrimp trawl, the change of fishing tail number caused by the trawling time was investigated on the ridge chick,