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Chapter 30,980

Distributional changes of roughscale sole Clidoderma asperrimum off the Pacific coast of northern Honshu, Japan

Hattori, T.; Ueda, Y.; Narimatsu, Y.; Ito, M.

Bulletin of the Japanese Society of Fisheries Oceanography 72(1): 14-21

2008


Accession: 030979506

Total catch of roughscale sole Clidoderma asperrimum off the Pacific coast of northern Honshu, Japan Tohoku area, 35 degrees 00'-41 degrees 30'N) decreased from 6,329 tons in 1978 to 108 tons in 1998. In this study, the monthly distributional changes of roughscale sole were examined using catch per unit effort (CPUE) data off Miyagi, Fukushima and Ibaraki Prefectures (southern Tohoku, 35 degrees 00'-39 degrees 00'N) in 1972-2005. Main fishing grounds were formed off Miyagi and Ibaraki in the 1970s/1980s, but the CPUE of this species decreased in all areas in the 1990s. In 2003-2005, the CPUE was low off Miyagi and Fukushima, while the CPUE off Ibaraki showed an increase during February-April. Histological observations of gonads indicated that all individuals (n=22) caught off Ibaraki in February 2007 were spawning fish. These results suggest that the spawning population decreased from the 1970s to the 1990s/2000s, and adult fish migrate to spawning grounds only off Ibaraki in recent years. Fishing control in the spawning grounds should be executed for the resource recovery of the population.

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