Venus (Journal of the Malacological Society of Japan)
Online ISSN : 2189-7697
Print ISSN : 1348-2955
ISSN-L : 1348-2955
原著
北海道安平川におけるカワシンジュガイと宿主の分布の不一致
秋山 吉寛 岩熊 敏夫
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ジャーナル オープンアクセス

2009 年 67 巻 3-4 号 p. 199-205

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抄録

We verified the host fish species for the freshwater pearl mussel Margaritifera laevis and compared the distributions of M. laevis and its hosts in the Abira River in central Hokkaido. Among the six species and a mutant form of rainbow trout (Oncorhynchus mykiss), mussel glochidia were found only from the gills of the masu salmon (Oncorhynchus masou masou) with an infection rate of 84.2%. Some of the attached glochidia on the fish were well grown. Although O. mykiss belongs to the same genus as the masu salmon, glochidia did not parasitize O. mykiss including the mutant form. The distribution of masu salmon was limited to a 2-km reach in the upper third of the stream where the mussel was distributed. The result suggested that in the Abira River, most of the free-living glochidia had been flushed down to die without encountering their host fish.

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