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Fishery characteristics of barfin flounder Verasper moseri in southern Tohoku,the major spawning ground,after the start of large-scale stock enhancement in Hokkaido,Japan |
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| Authors: | Toshihiro Wada Kyoichi Kamiyama Shinya Shimamura Osamu Murakami Tadashi Misaka Masayoshi Sasaki Takaaki Kayaba |
| Institution: | 1. Soma Branch, Fukushima Prefectural Fisheries Experimental Station, Soma, Fukushima, 976-0022, Japan 2. Fukushima Prefectural Fisheries Experimental Station, Iwaki, Fukushima, 970-0316, Japan 3. Mariculture Fisheries Research Institute, Hokkaido Research Organization, Muroran, Hokkaido, 051-0013, Japan 4. Wakkanai Fisheries Research Institute, Hokkaido Research Organization, Wakkanai, Hokkaido, 097-0001, Japan 5. Kushiro Fisheries Research Institute, Hokkaido Research Organization, Kushiro, Hokkaido, 085-0024, Japan |
| Abstract: | Commercial landings of a rare pleuronectid flatfish, barfin flounder Verasper moseri, recovered drastically after large-scale stock enhancement in Hokkaido conducted since 2006. This study investigated commercial landings, fishing grounds, size distributions, and sex and age compositions of barfin flounder during 2007–2011 in southern Tohoku, their major spawning ground, which is over 700 km south of Hokkaido. Landings, mostly comprising stocked fish, increased drastically in southern Tohoku: from 2.0 tons in 2007 to 20.8 tons in 2010. Over 98 % of them were landed during January–April, with the peak period during February–March. Fishing logbook data of offshore bottom-trawl vessels during 2007–2010 revealed the upper continental slope off southernmost Tohoku as the main fishing ground (35°40′–36°50′N, annual weighted mean depth 267–299 m). Two size modes in the landings consisted of males (ca. 40 cm) and females (ca. 60 cm). The main age at fishery recruitment in southern Tohoku was younger for males (age 2+) than for females (ages 3+ and 4+), the result of which was that the female percentage was lowest at 1.5 % in 2009 and highest at 7.9 % in 2011. Our results showed clearly how the effectiveness of large-scale stock enhancement in Hokkaido extended to southern Tohoku in association with spawning migration of stocked barfin flounder. |
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