The growth rate of 16 juvenile chum salmon Oncorhynchus keta (180–286 mm fork length) captured in the Sea of Okhotsk offshore during autumn 2002 was estimated using daily-incremental analysis of otoliths. The specimens originated from Hokkaido, Japan, and Sakhalin and Kamchatka, Russia. The average (range) of estimated mean daily growth in fork length was 1.19 (1.02–1.54) mm/day through the entire early ocean life and 1.05 (0.84–1.21) mm/day during the first 30 days after sea entry. These growth rates were higher than those reported previously for coastal resident or migrant juvenile chum salmon along the coast of Japan. Keywords Early marine life · Growth rate · Pacific salmon · Sea of Okhotsk Introduction growth-dependent mortality exists for fish originating from Japanese rivers. Thus, juvenile chum salmon migrate into Juvenile chum salmon Oncorhynchus keta originating from the Sea of Okhotsk offshore after evading the initial massive Japan migrate to the Sea of Okhotsk offshore, where they mortality in coastal waters. remain during their first summer and autumn with Russian Nonetheless, the growth rate of juvenile chum salmon in stocks (Urawa et al. 2004; Chistyakova and Bugaev 2013). the Sea of Okhotsk offshore has not been reported to date. Chum salmon undergo massive mortality during their The purpose of
Ichthyological Research – Springer Journals
Published: May 30, 2018
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