Affiliation: | Monbetsu Branch, Hokkaido Abashiri Fisheries Experimental Station, Monbetsu, Hokkaido 094-0011,;Hokkaido Kushiro Fisheries Experimental Station, Kushiro, Hokkaido 085-0024,;Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 and;Tohoku National Fisheries Research Institute, Shiogama, Miyagi 985-0001, Japan |