Distinction of growth group based on otolith diameter length of brown sole Pleuronectes herzensteini in northern Hokkaido, Japan, 1: Growth group of commercially captured fish at age one to three
2006
Shimoda, K.(Hokkaido. Fish Hatchery, Eniwa (Japan)) | Itaya, K. | Murooka, M.
Growth groups of brown sole Pleuronectes herzensteini population in northern Hokkaido Japan, were distinguished based on the otolith diameter length. The Okhotsk Sea growth group was regard as 91.1% of the commercial landings at the Esashi fish market on the Sea of Okhotsk in autumn of fish age one to the winter of fish age three. All individuals of commercial landings at the Wakkanai fish market in the Soya Strait in the winter of age two were classified into the Okhotsk Sea growth group. Over 86% of the commercial landings at Teshio to the Yoichi fish market in the Sea of Japan in the spring of age two were regarded as the Okhotsk Sea growth group. These results suggest that some of Okhotsk Sea growth group migrate to the Sea of Japan at age two in the winter and arrive in the Ishikari Bay at spawning Season at age two. The body size of age two and three fish of the Japan Sea growth group captured by the survey in the Ishikari Bay and the coast of Obira, were smaller than that of commercial landings. We estimated that most of the Japan Sea growth group were commercial landings after age three in the spring.
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