INTERACTIONS BETWEEN KURIL SEALS AND SALMON TRAP NET FISHERY IN THE COASTAL WATERS OF SOUTHEASTERN HOKKAIDO |
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| Authors: | Kazuo Wada Shin-Ichi Hayama Toshiyasu Nakaoka Hiroyuki Uno |
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| Institution: | Department of Environmental Science &Natural Resources, Tokyo University of Agriculture &Technology, Saiwaicho, Fuchushi, Japan;Nippon Veterinary &Zootechnical College, Kyonan-cho, 1-7-1, Musashino-shi, Tokyo, Japan;Socio-education Section of Erimo Town Office, Erimo-cho, Horo-izumi-gun, Hokkaido, Japan;Bihoro Museum, Bihoro, Hokkaido, Japan |
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| Abstract: | An annual average of 163 Kuril seals was found dead in two years in salmon trap nets along the coastal waters of the Nemuro Peninsula and adjacent areas. The seal-caused damage to the total salmon catch at the salmon trap nets was concentrated in some of them, particularly No. 27, where seals killed or injured 5.1% of the catch in 1982, and 1.8% in 1983. Based on the proportion of Kuril seals among the dead seals in the trap nets, it was estimated that Kuril seals damaged 4.7% of the total salmon catch at No. 27 in 1982, and 1.7% in 1983. Not all seals that entered the trap net drowned; some killed or damaged salmon, and then escaped. |
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| Keywords: | Key works: Kuril seal Phoca vitulina stejnegeri salmon trap net fishery southeastern Hokkaido salmon damage incidental catch |
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