Smelts of the Genus Hypomesus of Lake Bolframe0shoe,
Bolframe1shoi Shantar Island (the Shantarskie Islands)

M. Yu. Pichugin1 and M. B. Skopets2

1Moscow State University, Vorob’evy gory, Moscow, 119899 Russia

2Institute of Biological Problems of the North, Far East Division, ul. Karla Marksa 24, Magadan, 685000 Russia

Received March 3, 2004

Abstract—The finding of sympatric smelts Hypomesus japonicus and H. olidus in a brackish-water lake of
lagoon origin on Bol’shoi Shantar Island is reported. Their morphological description is presented. Some dif-
ferences from migratory ecotopes testify that the two populations belong to a resident form. A comparison of
new data with published data (Lindberg and Dul’keit, 1929) indicates that H. japonicus was formerly recorded
on the Shantarskie Islands under the name of Mesopus olidus, while H. olidus was found and investigated by
us for the first time. It is assumed that differences between species of the genus Hypomesus, according to a set
of osteological and meristic characters, are a consequence of pedomorphosis.

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