| Summary: | A holocentrid Ostichthys japonicus (Cuvier, 1829), a platycephalid Platycephalus sp., a cottid Icelus sekii Tsuruoka, Munehara and Yabe, 2006, an agonid Bothragonus occidentalis Lindberg, 1935, and a stichaeid Lumpenopsis pavlenkoi Soldatov, 1916 were collected from off Usujiri, Hakodate, Hokkaido, northern Japan, the western North Pacific. Ostichthys japonicus was previously recorded from the south of Aomori Prefecture and further southern waters; thus present report represents the northern-most record of the species. Platycephalus sp. and B. occidentalis were known only by pelagic juveniles from off Usujiri. Hence, we report the first records of adults of these species from this waters. As I. sekii was previously known only from its type locality, off Rausu and Urakawa, Hokkaido, present report is the second and the southern-most records of this species. Lumpenopsis pavlenkoi has been collected from Peter the Great Bay, Okhotsk coast of Hokkaido and the waters around the Kamchatka Islands, thus present report represents southern-most record of this species in the Pacific Ocean.
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