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서해 어획대상 잠재생산량 추정을 위한 자원평가모델의 비교 분석

Comparative analysis of stock assessment models for analyzing potential yield of fishery resources in the West Sea, Korea

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참고문헌

키워드

주제분류수산학

초록

본 연구에서는 서해 어획대상의 잠재생산량 추정에 가장 적합한 자원평가모델을 비교․분석하고, 해당 모델을 바탕으로 서해 어획대상의 자원상황을 파악하고자 하였다. 자원평가모델 선정을 위해서 과정오차모델, 관측오차모델, 그리고 Bayesian State-space 모델의 평가결과를 비교하였다. 분석 결과, Bayesian State-space 모델을 통해 추정된 연도별 단위노력당어획량이 실제 단위노력당어획량 자료를 가장 잘 반영하는 것으로 추정되었다. 따라서 분석 모델 중 Bayesian State-space 모델이 서해 어획대상의 잠재생산량 추정에 가장 적합한 것으로 평가되었다. Bayesian State-space 모델을 이용한 서해 어획대상 잠재생산량 추정 결과, 서해 어획대상의 잠재생산량은 231,949톤으로 나타났다. 그리고 서해 수산자원량의 경우 1967년 이후 지속적으로 감소한 것으로 나타났으며, 특히 2013년의 자원량은 최대지속적생산을 위한 자원량 수준의 약 36%에 불과한 것으로 추정되었다.

Abstract

This study is aimed to compare stock assessment models depending on how the models fit to observed data. Process-error model, Observation-error model, and Bayesian state-space model for the Korean Western coast fisheries were applied for comparison. Analytical results show that there is the least error between the estimated CPUE and the observed CPUE with the Bayesian state-space model; consequently, results of the Bayesian state-space model are the most reliable. According to the Bayesian State-space model, potential yield of fishery resources in the West Sea of Korea is estimated to be 231,949 tons per year. However, the results show that the fishery resources of West Sea have been decreasing since 1967. In addition, the amounts of stock in 2013 are assessed to be only 36% of the stock biomass at MSY level. Therefore, policy efforts are needed to recover the fishery resources of West Sea of Korea.

참고문헌 (30)

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