Fish fauna of the rivers in the Shima Region, Mie Prefecture, Central Japan.

概要

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Fish fauna of the rivers in the Shima Region, Mie Prefecture, central Japan, was surveyed between August 1997 and March 1998. A total of 4, 206 individuals of 37 species/subspecies belonging to 14 families were collected from 17 stations (15 rivers or streams) by casting net, hand net, or small set net. Of these, in addition, <I>Cyprinus carpio</I> were observed at 5 stations, 18 species were new additions to the river fish fauna of the region. Generally, river fish fauna of the region did not show large seasonal fluctuations, although migration and rarity of some species resulted in apparent seasonal fluctuations at some stations. Fishes collected or observed during the survey comprised genuine freshwater (18 spp.), diadromous (12 spp.) and peripheral freshwater (8 spp.) species, the overall displaying intermediate between those in the Ise-Bay Region (characterized by plentiful genuine freshwater species) and those in the Kumano Region (fewer genuine freshwater but abundant peripheral freshwater species). Rivers in the Shima Region have remained relatively suitable environments from the point of view of natural habitats with the existence of five species classified as 'endangered', 'vulnerable' or 'near threatened'.
日本魚類学会の論文