2段抽出の市場調査による種苗放流効果の推定

概要

論文の詳細を見る
In this study we evaluated the effectiveness of fish stock enhancement programs using a twostage random sampling survey of commercial landings. Estimators for the total number of fish landed, the ratio of the number of fish released to the total number of fish landed, the recovery rate, and the amount of income were formulated. Variance formulas for these estimators were derived. The tagging rate was also considered for these estimators. In a case study of the flounder fisheries off Fukushima Prefecture, we obtained a conservative estimate of 36, 982 recoveries from 246, 300 hatchery-reared fish over three years after release. The ratio of the recovery rate to the number of fish released was 0.15. The total income and benefit estimate were 32.6 and 7.9 million yen, respectively. We found that the stock enhacement program was economically profitable.
日本水産學會の論文