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Stock Proxies in Efficiency Analysis of Fisheries

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  • This study proposes three methods for technical efficiency (TE) estimation using three different fish stock proxy measures while applying the stochastic production frontier (SPF) approach. We apply these methods to two Vietnamese offshore fisheries, gillnet and hand-line, for which measures of stock abundance are unavailable. Based on the assumption of unitary elasticity for both effort and the stock index, our results show that using data envelopment analysis (DEA) is more robust than catch-per-unit-effort (CPUE) measures in deriving a composite stock index to account for differences in stock conditions between periods. The SPF model using the DEA estimate of the stock index is free of production-related assumptions and is not subject to a distortion in the measures of production elasticities. Based on the consistency conditions of the efficiency estimates, we find no difference between efficiency scores based on CPUE or DEA measures. When the average characteristics of the vessels over periods are similar, the CPUE measures are not subject to a distortion in the measures of TE and can provide robust efficiency estimates. The empirical results indicate a decrease in stock abundances - probably due to overfishing of offshore resources.
  • Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, held July 11-15, 2016 at Aberdeen Exhibition and Conference Center (AECC), Aberdeen, Scotland, UK.
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  • Challenging New Frontiers in the Global Seafood Sector: Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, July 11-15, 2016. Compiled by Stefani J. Evers and Ann L. Shriver. International Institute of Fisheries Economics and Trade (IIFET), Corvallis, 2016.
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  • 0976343290

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