Effectiveness of stock enhancement programs for the kuruma prawn, Penaeus japonicus, in Japan: Present status and problems
2005
Hamasaki, K.(Tokyo Univ. of Marine Science and Technology (Japan)) | Kitada, S.
In order to elucidate the present status of stock enhancement programs for kuruma prawn and analyze their effectiveness, we present trends in fishery and release statistics for this species for all of Japan using data for seven specific areas. In addition, we review the results of recent marking surveys for estimating recapture rates of released juveniles. Kuruma prawn catch greatly decreased after the mid-1980s, and juvenile release did not very much affect catch trends throughout Japan. Although the estimated recapture rates exceeded the breakeven point in only a few case studies, high recapture rates were reported in several cases. These facts suggest that stock enhancement of kuruma prawn can be successful on the local scale. It is therefore important to use scientific methodology in order to estimate recapture rates and evaluate the effectiveness of stock enhancement programs for kuruma prawn in respective localities.
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