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要 約
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The Nakhodka, a Russian tanker, sank with C-type heavy fuel oil in the Sea of Japan, off the shore of Shimane Pref. on 2 January, l997. The oil reached the coasts of Fukui Pref. between 7 and about 27 in January. A total of 170 birds of 19 species (six families of five orders) was found oiled along the seashore from 9 January to 10 March: 72 live birds (42.4%) and 98 dead birds (57.6%). The majority of the oiled birds was oceanic seabirds, Hornbilled Puffins (31.2%) , Ancient Murrelets (14.7%) , Pacific and Black-throated Divers (14.1% in total) and Red-necked Grebes (12.4%), which totalled 86.4% of all birds. The average mortality of each species was 54.1%, of which the rate of Hornbilled Puffins was the highest (98.1%). The weight and number of fish given were correlated with the body weight of the rehabilitated birds accordingly. Birds of each species were fed with a food volume of 26.5〜64.5% of their body weight. A total of 34 birds (20.0% of all the birds) was transported to the releasing site after a mean of 11.7 days. Birds which were physically handicapped died in a mean of 13.8 days during the rehabilitation. The high mortality of the oiled birds seemed to be due to the bad weather conditions, insufficient facilities and a lack of experts for bird rescue in the area.
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