First record of the Siberian lamprey, Lethenteron kessleri, from Honshu Island, Japan.

概要

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Thirty-six specimens of the Siberian lamprey, Lethenteron kessleri (Anikin, 1905), collected from the Kuji River, north-eastern Honshu Island, Japan, in 1965, represent the only record of this species from Honshu Island. Relative measurements of their snout length and eye diameter divided by branchial length, plus the number of trunk myomeres, showed lower values than those reported for specimens collected from Hokkaido Island, suggesting geographic variation. Lethenteron kessleri probably originated in the Siberian region, subsequently dispersing via freshwater into the northern part of Japan. The Kuji River population of L. kessleri is considered to represent the original distribution of the species in north-eastern Honshu Island, as already shown for Tribolodon ezoe and Cottus nozawae.
日本魚類学会の論文