A Temperature-Dependent Growth Equation for Larval Chub Mackerel (Scomber japonicus)

고성길,Kyunghwan Lee,정석근 한국해양과학기술원 2020 Ocean science journal Vol.55 No.1

Chub mackerel are commercially one of the most important species in the western North Pacific. Variations in water temperature and growth during the early life stages are critical in determining the subsequent recruitment and potential catch of chub mackerel, but yet no study has explicitly provided a temperaturedependent growth equation for chub mackerel larvae. Here we propose a Gompertz-Laird growth equation as a function of ambient water temperature (T) for chub mackerel larvae by revisiting and utilizing the experimental data reported by Hunter and Kimbrell (1980). The derived equation was L t = 38.5126[0.31/38.5126]exp(−αt), where L t is standard length in cm, t is age in days, and α = 0.0028 exp (0.0971T). Our simulations showed that a difference in the ambient water temperature between 14°C and 25°C can lead to differences in the stage duration of mackerel larvae by a factor of 3, and in the larval survival rate by a factor of 40, suggesting that the variability in temperature-dependent growth can greatly determine the recruitment success of mackerel. We expect that our derived growth equation will be useful in evaluating and projecting climate-change effects on the recruitment, spatial distribution and potential catch of chub mackerel by developing and applying bio-physical coupling models, but further studies on regional differences regarding growth parameters are required.

생체량 크기 스펙트럼 모델과 인공위성 해색자료를 이용한 한국 해양의 수산자원 잠재생산량 추정

고성길,정석근 한국수산과학회 양식분과 2017 한국수산과학회 양식분과 학술대회 Vol.2017 No.5

모델 변환기를 이용한 전투 21과 K1 전차 시뮬레이터의 연동 방안

고성길,이태억,김대규,최미선,Ko, Sung-Gil,Lee, Tae-Eog,Kim, Dae-Kyu,Choi, Mi-Seon 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5

We examine interoperability for integrated training simulation of a mechanized infantry battalion that uses a war game model of Korean army, Combat 21, and virtual simulators of K1 tanks. We discuss issues and problems for integrated simulation of the virtual and constructive models, including differences between the model scopes, model resolutions, engagement algorithms, and data consistency and training audiences of the war game model and virtual simulators. From these, we identify interoperability requirements. We propose ways of resolving the problems using a model converter.

대대급 훈련을 위한 대리객체 기반의 Virtual-Constructive 시뮬레이션 모델 연동 프레임워크

고성길,이태억,이상진 대한산업공학회 2009 대한산업공학회 추계학술대회논문집 Vol.2009 No.10

육군 대대급 이하 훈련의 비용 및 위험을 줄이면서 현실감을 높이기 위해서는 Live, Virtual, Constructive 시뮬레이션 모델을 적절하게 구성하고 이들 간의 긴밀한 상호연동이 요구된다. 이를 위해서는 이들 상이한 모델들이 동일한 합성전장환경에서 상호작용이 이루어지도록 모델 연합(Federation)이 구성되어야 하나 모델간의 해상도 차이를 해결해야 한다. 본 연구에서는 개별 무기체계를 모의하는 가상시뮬레이터들로 구성된 Virtual 모델과 다수의 무기체계 또는 전투요소들을 군집화 하여 단순화된 전투 상태 및 행태만을 모의하는 Constructive 모델간의 교전방식 및 해상도 차이를 해결하기 위해 대리 객체를 활용하는 방안을 제안하고 연동 예제를 제시한다.

Estimation of Size-Dependent Mortality of Chub Mackerel (Scomber japonicus) Based on Their Fecundity

고성길,정석근 한국해양과학기술원 2023 Ocean science journal Vol.58 No.3

We estimated the size-dependent mortality of chub mackerel, Scomber japonicus, for the entire life stages from egg to adult by using a Leslie matrix model based on their fecundity, assuming the steady-state and the bigger-is-better hypothesis. The daily body size was determined by the temperature-dependent Gompertz–Laird and the temperature-independent von Bertalanffy growth equation. The derived constant for size-specific instantaneous mortality was 0.11 day− 1 cm in fork length. The estimates of age-specific mortality ranged from 8.04 yr− 1 for age 0 to 1.04 yr− 1 for age 6 + . Our simulations showed that as the growth rate increases, the mortality decreases, and the recruitment level increases as the ambient water temperature from the egg to larval stages increases from 14 to 22 °C. Comparisons of the length frequencies derived from our Leslie matrix with the catch data suggested that our theoretically derived mortality is reliable enough for the purpose of stock assessment for fisheries management. We expect our approach will be applied in developing bio-physical coupling models for evaluating and projecting the influences of climate change and warming ocean on fish stocks.

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.

북서태평양 살오징어(Todarodes pacificus) 겨울계군의 크기에 따른 사망률 추정

이다민,고성길,정석근 한국수산과학회 2024 한국수산과학회지 Vol.57 No.1

We have proposed a method for estimating the size-dependent mortality (M) of short-lived semelparous cephalopod species. To estimate the size-dependent mortality of a winter cohort of the common squid Todarodes pacificus, a commercially important cephalopod species in the North Pacific, we used the data and results of previous studies. On the basis of the bigger-is-better the steady-state hypothesis, we derived a theoretical mortality curve by assuming M as an inverse function of mantle length (ML). The derived constant for size-specific instantaneous mortality (q), assuming an embryonic survival rate of 86.6%, was 0.413 day-1 mm in ML. Estimates of life-stage-specific M ranged from 0.0280 to 0.435 day-1 for paralarvae, 0.00278 to 0.0269 day-1 for juveniles, 0.00197 to 0.00275 day-1 for prespawning adults, and 0.0913 to 0.0920 day-1 for post-spawning adults. Sensitivity analyses showed that the derived size-dependent M did not significantly change with varying embryonic survival rates, from 48%, the lowest reported value, to 100%. Additionally, comparison of the length frequencies derived from our simulations with those derived from catch data did not show a significant difference, suggesting that our approach and procedures are reliable for stock assessment and management of the common squid.

Long-Term Changes in Fish Assemblage Structure in the Korea Strait from 1986 to 2010 in Relation with Climate Change

이경환,고성길,정석근 한국해양과학기술원 2021 Ocean science journal Vol.56 No.2

Climate change is expected to impact on marine-capture fisheries around the world. The Korea Strait showes the highest fisheries production among the adjacent seas of Korea, but studies on changes in the fish community related with climate change are scarce. We evaluated the spatio-temporal changes in fish assemblages, and their relationships with oceanic conditions in the Korea Strait (KS, 126°–129°5′E, 33°5′–35°N) to provide a scientific basis for developing fisheries policies to adapt to climate change and global warming. We used the inflow indices of the Korea Strait Bottom Cold Water and the Tsushima Warm Current, water temperature and salinity, and commercial fisheries catch data from 1986 to 2010. To detect temporal shifts in the oceanic conditions, we applied a sequential t test of regime shift. To evaluate spatio-temporal changes of the fish assemblage structure by year, month, and fishing block, we graphically summarized the species compositions of the commercial fisheries catch data by correspondence analysis (CA). We conducted cross-correlation and canonical CA to evaluate the relationship between the oceanic conditions and fish assemblages. Sardine and filefish dominated in spring and were mainly distributed far away from the coast. Anchovy were mostly caught in summer near the southeast coast of Korea, and their annual catch steadily increased. Squid and hairtail dominated in autumn–winter, and were mainly distributed from the northern part off Jeju Island to the southeast water of Korea. Chub mackerel were relatively constant in annual and seasonal catch. CA detected a shift in the fish assemblage between 1990 and 1991, which we speculated was triggered by the 1988–1989 regime shift in the North Pacific. Surface temperatures at 0–20 m depths, especially with a time lag of 1 year, were significantly correlated with the 1990–1991 shift in fish assemblage structure. We concluded that (1) the KS is an intermediate area between the waters of Ieodo and the East Sea with respect to the timing of shift in fish assemblage structure, (2) the regional shifts were characterized by the replacement of dominant fish species from sardine and filefish to chub mackerel and squid. We hope that further multidisciplinary studies between regional oceanographers and fisheries scientists will contribute to the development of fisheries policies through better understanding of the interactions between oceanographic processes and fishes at the regional scale in adaptation to climate change.

객체기반 LVC 통합 방안에 대한 연구

방경태,이상진,고성길,이태억 대한산업공학회 2008 대한산업공학회 추계학술대회논문집 Vol.2008 No.11

전쟁양상의 변화와 첨단전투장비의 등장, 훈련비용 증가 및 제한된 훈련여건 등의 이유로 이에 상응하는 효율적인 훈련체계 구축을 위한 많은 노력이 이루어지고 있다. 본 논문에서는 이를 위해 LVC요소를 유기적으로 결합하여 상호 운용성과 재사용성을 보장하는 LVC통합 체계 구축방안을 제안한다. 상호 운용성 증진을 위해 메타 모델 기반의 공통 모델링 체계와, 이를 효과적으로 지원할 수 있는 공통 자원 체계의 개념을 제안한다. 이를 바탕으로 훈련 및 분석 뿐만 아니라 무기 획득, 개발 분야에도 활용 가능한 구성 모의 중심의 LVC 통합 체계를 제안한다.

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 420×10³ 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_c), and 3) water temperature. The result of our analysis showed that the Y/R could be greatest when the L_c 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 L_c 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.