Genetic Stock Identification of Juvenile Chum Salmon Caught in the Okhotsk Sea During the Fall of 2003

摘要

Juvenile chum salmon (Oncorhynchus keta) are abundantly distributed in the Okhotsk Sea during the fall season (Ueno 1997; Melnikov et al. 1999a, 1999b; Lapko and Glebov 2001; Volvenko 2003). The first genetic stock identification (GSI) study suggested that the Japanese stock was dominant among juvenile chum salmon caught in the southern Okhotsk Sea (45-49°N, 145-152°E) in October 1993 (Urawa et al. 1998, 2001). On the other hand, Russian stocks were dominant in the southwestern water (46-51°N, 146-150°E) in October 2000 (Urawa et al. 2006). Urawa et al. (2004) estimated the stock origins of juvenile chum salmon caught in the wide areas of the Okhotsk Sea (45-55°N and 146-152°E) in October 2002 using allozyme and otolith marks, and confirmed that the stock composition was different among the sampling locations.