Seasonal Changes in the Length Compositions of the White-spotted Conger, Conger myriaster, Caught by the Small Trawl Fishery in Harima-Nada and the Possible Use of Enlarged Mesh Size for Resource Management.

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The white-spotted conger, which is liable to limit the mesh size of the cod end, is one of the most important fish species caught by the small trawl fishery in Harima-Nada, Seto Inland Sea. Recently, fishery resource management has become more and more important and the protection of under-sized fish is necessary for the effective use of fish resources. In small trawl fishery, one way to protect small-sized fish is to enlarge the mesh size of the cod end. The present study was performed to understand the seasonal changes of length compositions, mesh selectivity, and artificial selectivity in the white-spotted conger. The experiment was carried over one year. In Harima-Nada, a cohort of small size fish occurred in August was caught continuously for nearly a year. Fish over 450 mm were rarely caught in this study. The artificially selected size for landing was over 250 mm. However, since the wholesale price is markedly higher for sizes over 300 mm, enlargement of the mesh size of the cod end is recommended for the future resource control.
日本水産増殖学会の論文