標識再捕から推定した死亡率によるマダイ人工種苗の種苗性の比較

概要

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This paper evaluates the difference in quality of red sea bream fingerlings reared by different methods. We released two groups of fingerlings to the same fishing ground at the same time in the Seto Inland Sea. One group had been reared in net cages and the other had been conditioned with food in the sea around the net cages. We estimated mortality rates simultaneously from two series of tag recoveries and obtained the maximum likelihood estimates for four models with constant fishing and natural mortality rates. The correlation coefficient between the two recoveries was estimated to be more than 0.9, and the likelihood ratio test rejected the hypothesis of no difference in the two groups (p ?? 0.01). We found that fingerlings reared in net cages had higher mortality rates and a stronger tendency toward schooling than those reared in the wild. This paper also discusses methods for obtaining high survival rates after release.
日本水産學會の論文