北海道東部厚岸湾におけるアザラシ類による漁業被害 : 漁業者アンケートの解析2004-2007年

抄録

We used a questionnaire survey to gather information on the damage caused by seals to fishing gear and captured fish during 2004-2007 around Akkeshi Bay in Eastern Hokkaido, Japan. The damage to the fishing gear consisted of damage to the small fixed shore net and the gill net. Nine seal-damaged fish species reported are as follows: ice fish (Salangichthys microdon), Pacific herring (Clupea pallasii), Arctic rainbow smelt (Osmerus eperlanus mordax), righteye flounder (Pleuronectidae), Japanese surfsmelt (Hypomesus japonicas), capelin (Spirinchus lanceolatus), sailfin sandfish (Arctoscopus japonicus), saffron cod (Eleginus gracilis), and Japanese fluvial sculpin (Cottidae). These fish species were damaged by Kuril harbor seals and spotted seals. The percentage of fishery damage reported by local fishermen was 2.75 ± 3.53 % (range 0.39-7.92%) of the total catch of each damaged fish in Akkeshi Bay. Two main peaks were observed: one during early spring from March to April and the other during autumn from September to October.