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Growth and habitat of spotted halibut Verasper variegatus in the shallow coastal nursery area, Shimabara Peninsula in Ariake Bay, Japan
Authors:Toshihiro Wada  Naoki Mitsunaga  Hiroyuki Suzuki  Yoh Yamashiya  Masaru Tanaka
Institution:Division of Applied Biosciences, Graduate School of Agriculture and;Field Science Education and Research Center, Kyoto University, Kitashirakawa, Kyoto 606-8502 and;Nagasaki Prefectural Institute of Fisheries, Nagasaki 851-2213, Japan
Abstract:ABSTRACT:   To determine the growth performances and habitat characteristics of spotted halibut Verasper variegatus , successive samplings were conducted in the south-eastern coastal area of Shimabara Peninsula in Ariake Bay. The push-net samplings were performed at Kamaga beach from May 2003 to April 2004 to determine the horizontal distribution of larvae and juveniles, while the gill net samplings were done in the coastal waters of Tatsuishi beach from July 2003 to July 2004 to collect the larger juveniles and adults. A total of 478 individuals from metamorphosing larvae to 2-year-old fish (15.2–447.0 mm total length TL]) were sampled. In particular, the 2003-year class fish were successively collected from May 2003 to June 2004 (15.2–350.0 mm TL; n  = 418) and the mean total length in March, June, September, December 2003 and May 2004 was 22.4, 82.5, 172.5, 203.9 and 296.4 mm, respectively. The present study found that metamorphosing larvae migrated into the estuarine tidal flats during March 2003; newly settled juveniles inhabited the shallow intertidal areas; and juveniles had a remarkably high growth in shallow coastal areas. It is suggested that young fish around 300 mm TL migrated from the nursery grounds in Ariake Bay to deeper waters around Tachibana Bay during May–June 2004.
Keywords:Ariake Bay  growth  intertidal area  juvenile  larva  shallow nursery habitat  spotted halibut              Verasper variegatus
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