모의실험을 통한 한국 연근해 고등어(Scomber japonicus)의 가입당 생산분석
Simulation-based Yield-per-recruit Analysis of Chub Mackerel Scomber japonicus in Korean Waters
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초록
Chub mackerel Scomber japonicus is an economically important pelagic species in the western North Pacific. In the last 50 years, the annual total catch in Korean waters showed large fluctuations, ranging from 100 to 420×103 tons. To provide a biological reference point for management of chub mackerel, we applied a simulation-based yield-perrecruit (Y/R) model that considered both temperature-dependent growth and size-dependent mortality. We estimated the fisheries yield with respect to varying biological reference points and environmental conditions, including 1) the instantaneous rate of fishing mortality (F), 2) length of fish at first capture (Lc), and 3) water temperature. The result of our analysis showed that the Y/R could be greatest when the Lc ranges from 19-27 cm and F ranges from 1.48–2.00 yr-1. Y/R increases with increased water temperature between 15 and 23℃. We suggest targeting an Lc of 17 cm (age=0.6 years) under the assumed current of F=0.48 yr-1 for maximizing the chub mackerel harvest. Further analysis considering spawning and recruitment processes are required to provide biological reference points to ensure the sustainability of chub mackerel fisheries in Korean waters.
Abstract
Chub mackerel Scomber japonicus is an economically important pelagic species in the western North Pacific. In the last 50 years, the annual total catch in Korean waters showed large fluctuations, ranging from 100 to 420×103 tons. To provide a biological reference point for management of chub mackerel, we applied a simulation-based yield-perrecruit (Y/R) model that considered both temperature-dependent growth and size-dependent mortality. We estimated the fisheries yield with respect to varying biological reference points and environmental conditions, including 1) the instantaneous rate of fishing mortality (F), 2) length of fish at first capture (Lc), and 3) water temperature. The result of our analysis showed that the Y/R could be greatest when the Lc ranges from 19-27 cm and F ranges from 1.48–2.00 yr-1. Y/R increases with increased water temperature between 15 and 23℃. We suggest targeting an Lc of 17 cm (age=0.6 years) under the assumed current of F=0.48 yr-1 for maximizing the chub mackerel harvest. Further analysis considering spawning and recruitment processes are required to provide biological reference points to ensure the sustainability of chub mackerel fisheries in Korean waters.
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