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http://dx.doi.org/10.5657/KFAS.2020.0942

Management Reference Points for Korea Chub Mackerel Scomber japonicus Stock  

Gim, Jinwoo (College of Fisheries Sciences, Pukyong National University)
Hyun, Saang-Yoon (College of Fisheries Sciences, Pukyong National University)
Lee, Jae Bong (Embassy of the Republic of Korea in Oriental Republic of Uruguay)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.53, no.6, 2020 , pp. 942-953 More about this Journal
Abstract
Achieving optimal sustainable yields (i.e., avoiding overfishing and maximizing fishery harvest at the same time) is one of the main objectives in fisheries management. Generally, management reference points (MRPs) such as fishing mortalities (Fmsy, F0.1, Fx%) have been suggested for the purpose. In this study, we intended to suggest MRPs for Korea chub mackerel Scomber japonicus stock, using a stochastic catch-at-age model (SCAA) and evaluate whether the current fishing intensity on the stock is appropriate. We used length frequency and catch-per-unit-effort data on the Korea chub mackerel stock collected from the large purse-seine fishery, and yields landed by all fisheries from years 2000 - 2019. We calculated yield per recruit and spawning potential ratio, and projected spawning stock biomass (SSB) under different fishing mortality, assuming annual recruitments were solely controlled by environmental effects (i.e., steepness of 1.0). Some of our major findings and suggestions were that the overfishing threshold would be F46%; i.e., the fishing mortality in the terminal year, 2019 was 0.257/year, which corresponded to F46%.
Keywords
Management reference points; Scomber japonicus; A stochastic catch-at-age model; AD model builder; Spawning potential ratio;
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