Results of release experiments of reared young black rockfish, Sebastes schlegeli, in the Suttsu area of southeastern Hokkaido [Japan]
2005
Sasaki, M.(Hokkaido. Kushiro Fisheries Experiment Station (Japan)) | Takiyama, S. | Nishiuchi, S.
This study on reared black rockfish, Sebastes schlegeli, released in the Suttsu area of southeastern Hokkaido in 1990-1997, aimed to ascertain the migration, age of recruitment, principal gear used and recapture period of tagged fish. Tagging experiments were conducted using yearlings (total of 37,701 fish except 1991, mean total length (TL): 73-150 mm) in October or November 1990-1997, and using one year-old fish (total of 1,066 fish, mean TL: 162 mm) in June 1996. Released rockfish were found at the release area and its adjacent waters and were mainly recaptured by fixed and bottom fixed set-nets. The number of recoveries began to increase from the summer in the first year and increased in April-June and October-December until tagged fish reached the age of 3 years. From these results, we concluded that tagged fish were mainly caught during the period from the autumn for one year-old fish, to the spring for 3 year-old fish at the release area and its adjacent waters using fixed and bottom fixed set-nets.
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