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모의실험을 통한 남해 멸치(Engraulis japonicus)의 어획조건에 따른 가입당 생산 분석
이경환,고성길,정석근,Lee, Kyunghwan,Go, Seonggil,Jung, Sukgeun 한국수산과학회 2017 한국수산과학회지 Vol.50 No.4
To evaluate the consequences of possible fisheries regulations of anchovy Engraulis japonicus in the Korea Strait, we developed and applied a simulation-based yield-per-recruit (Y/R) model that considered temperature-dependent growth and size-dependent mortality, covering the egg to adult stages. We projected changes in commercial yield and egg production of anchovy with respect to varying biological reference points of 1) the instantaneous fishing mortality, 2) the minimum fork length of anchovy allowed to catch for protecting smaller anchovy ($L_{c,min}$), and 3) the maximum fork length allowed to catch for protecting bigger anchovy ($L_{c,max}$). Our Y/R model showed that the anchovy yield will be maximized at ca. $1.4{\times}10^6tons$ when $L_{c,min}$ ranges between 42-60 mm or at ca. $0.8{\times}10^6tons$ when $L_{c,max}$ ranges from 88-160 mm. At $L_{c,min}=30mm$, the present minimum length of catch, our simulations indicated that the anchovy yield can reach a maximum of $1.2{\times}10^6tons$ in the long-term when the present fishing effort, which annually yields ca. $0.2{\times}10^6tons$ of anchovy, can be increased by a factor of 28. We expect that our simulation-based Y/R model can be applied to other commercially-important small pelagic species in which the traditional Beverton-Holt Y/R model is difficult to apply.
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모의실험을 통한 한국 연근해 고등어(Scomber japonicus)의 가입당 생산 분석
이경환 ( Kyunghwan Lee ),고성길 ( Seonggil Go ),정석근 ( Sukgeun Jung ) 한국수산과학회(구 한국수산학회) 2018 한국수산과학회지 Vol.51 No.3
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 420×10<sup>3</sup> tons. To provide a biological reference point for management of chub mackerel, we applied a simulation-based yield-per-recruit (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 (L<sub>c</sub>), and 3) water temperature. The result of our analysis showed that the Y/R could be greatest when the L<sub>c</sub> ranges from 19-27 cm and F ranges from 1.48-2.00 yr<sup>-1</sup>. Y/R increases with increased water temperature between 15 and 23℃. We suggest targeting an L<sub>c</sub> of 17 cm (age=0.6 years) under the assumed current of F=0.48 yr<sup>-1</sup> 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.
ScienceON
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