A record of the rare broadnose sevengill shark Notorynchus cepedianus off Yamaguchi [Japan] in the Sea of Japan
2005
Imai, C.(National Fisheries Univ., Shimonoseki, Yamaguchi (Japan)) | Ikeda, I. | Sakai, H.
The broadnose sevengill shark Notorynchus cepedianus, one of the most primitive present-day shark species, is characterized by seven pairs of large gillslits, a single short dorsal fin and bluish-gray dorsal body color with numerous dark spots. Although the species inhabits temperate continental shelf waters worldwide, ecological information is scarce because of limited catch data. A single female specimen (109.8cm total length, 5.26kg body weight) of N. cepedianus, incidentally caught by a long line fishery in south western Sea of Japan (4 km northeast of Futaoi Island, 45m depth) on 28 May, 2004, is documented here, being a rare record from Japan. Ten preserved specimens are known from Japanese waters, from Hokkaido, Wakayama, Ehime and an unspecified area (possibly Yellow Sea, East China Sea or western Sea of Japan), but only published record was from Tosa Bay, Kochi Prefecture. The present record appears to be the first published from Japan with detailed collection data accompanied by a voucher specimen.
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