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Numbers of masu salmon and Dolly Varden in streams in the Shiretoko Peninsula, location of the Shiretoko World Heritage Site in north eastern Hokkaido, appear to be declining. One concern is whether masu salmon smolts continue to migrate during July, after the existing May to June angling closure established to protect migrating smolts in eastern Hokkaido. Smolt timing and relative abundances were...
In the present study, the effects of starvation on kidney melano-macrophages (MM) in underyearling hatchery-reared masu salmon (Oncorhynchus masou) which were released into the river and underyearling wild masu salmon were examined histologically. One hundred and fifty fish were placed in a tank for each of the four study groups: wild-fed, wild-starved, hatchery-fed, and hatchery-starved. Starved...
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