• 한국패류학회지
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• 제24권3호
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• pp.189-197
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• 2008

In order to develop the sustainable ecological management, short-necked clams, Ruditapes philippinarum, were collected from Yoengi coast in Tongyoeng, Korea. The growth of the clam was estimated as: $L_f=68.08{\cdot}(1-e^{-0.145(t+0.324)})$ from ring radius composition of shell. Instantaneous co-efficiency of total mortality and natural mortality were calculated as: 0.991/year and 0.494/year, respectively. The age of the clams from the first capture was estimated to be 3.28. The total biomass was estimated to be 212 MT in the fisheries area (6.4 ha). Applied by these parameters, the annual recruit biomass and the current yield per recruit were calculated to be 649.5 individual/$m^2$ and $0.7\;g/m^2$, respectively. The current fishing intensity was much lower for maximum sustainable yield and acceptable biological catch. Although higher yield per recruit could be achieved by increasing fishing intensity, it is favorable to retain the current fishing intensity because of the unique fishing attitude on Yeongi coast in Tongyoeng, Korea.

• 자원ㆍ환경경제연구
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• 제26권4호
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• pp.613-639
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• 2017

카리브호수의 카펜타 자원량을 추정하기 위해 최대엔트로피(ME)모델과 분석적 모델이 적용된다. ME모델을 이용하여 25,372톤의 최대지속가능 어획량(MSY)과 MSY의 어획노력량인 109,731의 어획일수(fishing nights)를 추정하였는데, 이는 현재 어획노력량 수준이 과잉투자됨으로써 1988년 이후 2009년 현재까지 자원량을 감소시키는 요인인 것을 나타낸다. 분석적 모델은 매년의 생물학적 허용 어획량(ABC)과 연간 1.21의 어획사망계수(일반적 어획사망계수인 0.927 보다 큰)를 추정한다. 이 두 모델은 1982년 기준년도의 자원량 추정에 적용할 수 있는 유사한 자원량을 추정한다. ME모델에 의하면 1988년의 최대 자원량(156,047톤)에 대해 1/3수준이하 까지 점점 하락하는 결과를 추정하였는데, 이는 최근의 어획량이 MSY 수준 이하이지만 ABC수준보다 높게 나타나 남획된 것을 암시한다. 다시 말해서, 분석적 모델은 ME모델에서의 MSY보다 더 보수적인 ABC를 제공함으로써, 보수적인 어업관리정책(총허용어획량제도, 어획노력감소정책 등)을 적극적으로 고려해야함을 내포하고 있다.

• 한국수산과학회지
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• 제46권5호
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• pp.598-606
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• 2013

The blackfin flounder Glyptocephalus stelleri is a commercially important species in the East Sea of Korea, but its catches and biomass have decreased gradually in recent years. This study estimated the optimal catch (acceptable biological catch, ABC) for the effective management of this species by estimating population ecology parameters and the stock biomass of blackfin flounder in the East Sea of Korea. The estimated instantaneous coefficient of total mortality (Z) of blackfin flounder was 1.0542/year, the survival rate (S) was 0.3485, and the instantaneous coefficient of natural mortality (M) was 0.3637/year. From the values of S and M, the instantaneous coefficient of fishing mortality (F) was calculated to be 0.6905/year. The age at first capture was 1.304 years, and the total length was 11.5 cm at that time. On the basis of these parameters, the annual biomass was estimated by a biomass-based cohort analysis using annual catch data in weight by year for 1991-2012 in the East Sea of Korea. The annual biomass peaked in 1997 at about 12,800 mt and then subsequently declined continuously to a level of 10,500 mt in 2004 and to 9,800 mt in 2011 and 2012. The maximum sustainable yield and $F_{0.1}$ were estimated as 3,547 mt and 0.3595/year, respectively. Using these estimations, the ABC was estimated to be 3,571 mt in tier 5, 3,397 mt in tier 4, and 2,622 mt in tier 3.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
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• pp.328-329
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• 2000

This research is to estimate population parameters of the Korean horse mackerel stock and to determine the status of the stock. Considering the linkage of recruitment with the variation of environmental conditions in the early life history, acceptable biological catch (ABC) of horse mackerel was estimated. (omitted)

• 한국수산과학회지
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• 제35권6호
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• pp.686-695
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• 2002

Samples of Corbicula ( Corbicula) japonica Prime of Namdae Stream in Gangnung were collected from November 2000 to October 2001. Age of C. (C.) japonica was determined from the rings on the shell, The shell length of the samples ranged from 8 mm to 38 mm. The ring on the shell was formed once a year in March. Von Bertalanffy's growth parameters were estimated using a nonlinear regression method, asyinptotie shell length ($L_{\omega}$) was 48,98 mm, K was 0.20421year, theoretical age at 0 shell length $(t_0)$ was 0.3169 year, and asymptotic total weight ($W_{\omega}$) was 41.37 g. The formula of allomeky between shell length (L, mm) and total weight (W, g) of the brackish water clam was W=3.42$\times$10^{-4}L^{3}. The annual survival rate was estimated at 0.3799, instantaneous coefficient of natural mortality was 0.5007/year, and instantaneous coefficient of fishing mortality was 0.46721year. The age at first capture was estimated at 2.1593 year using shell length compositions of the brackish water clam, The current yield-per-recruit at 0.4672/year of fishing mortality was 0.6595 g. F_0.1 was estimated at 0.1865/year, Acceptable biological catch was estimated at 14.4 metric ton.

• 한국패류학회지
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• 제23권1호
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• pp.31-38
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• 2007

본 연구에서는 남해안 개조개의 자원생태학적 특성치인 생잔율 (S = 0.5174), 순간자연사망계수 (M = 0.2012/year) 및 순간어획사망계수 (F = 0.4578/year), 어획개시연령 ($t_c\;＝\;2.7506$ 세), 자원량 (B = 8.362 톤) 을 추정하였다. 갯장어 자원을 가입당생산량모델에 적용시킨 결과, 현재의 순간어획사망계수 (F = 0.4578/year), 어획개시연령 ($t_c\;＝\;2.7506$ 세) 에서의 가입당생산량은 80.89 g으로 추정되었다. 따라서 현재의 순간어획사망계수를 그대로 유지한다면 어획개시연령을 4 세 이상으로 높여야 하고, 현재의 어획개시연령을 유지한다면 순간어획사망계수를 0.2 보다 낮은 수준으로 낮추어야한다. $F_{0.1}$의 경우, 2 세에서 65.69 g으로 가장 높은 가입당생산량을 나타내고 있다. 또한 가입당산란자원량모델을 이용하여 생물학적 관리기준인 $F_{40%}$의 값을 현재의 어획상태를 고려하여 추정하였다.

• 수산해양기술연구
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• 제44권2호
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• pp.129-140
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• 2008

This study was performed to estimate biomass and to provide management plan through population ecological characteristics, including growth parameters, survival rate, instantaneous coefficient of natural and fishing mortalities, and age at first capture of hen clam, Mactra chinensis, in the Dong-li self-regulatory community of Busan. The von Bertalanffy growth parameters estimated from a non-linear regression were $SH_{\infty}=86.24mm$, K=0.12/year, and = -1.37year. Survival rate(s) of the hen clam was 0.515. The instantaneous coefficients of natural mortality(M) was estimated to be 0.232/year and fishing mortality(F) 0.432/year for hen clam. The current biomass of the hen clam in the study area was estimated to be 713mt and the acceptable biological catch(ABC) was estimated under various harvest strategies based on $F_{0.1}$ and $F_{40%}$.

• 한국패류학회지
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• 제27권2호
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• pp.107-114
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• 2011

바지락 (Ruditapes philippinarum) 은 모래와 진흙이 많은 연안에 주로 분포하지만 드물게 울산의 태화강처럼 하천의 중류나 하류에서도 분포한다. 울산 태화강에서는 예전부터 바지락이 서식해 왔으며 인근 어민들의 전통적인 소득원으로서 주요 수산자원의 대상이 되어 왔다. 본 연구는 2009년 6월부터 2010년 6월까지 바지락의 현장조사를 통하여 자원생태학적 특성, 자원량 및 적정어획량 등의 자원평가를 실시하고 지속가능한 자원관리의 방안 제시 및 어업정책 수립을 위한 기초자료를 확보하고자 하였다. 태화강 바지락의 수명은 6세로 추정되었고 von Bertalanffy growth function에 의하여 성장계수 K 및 $L_{\infty}$은 0.341 및 46.64 cm로 구해졌다. Pauly 방법에 의한 순간전사망계수 (Z) 및 어획개시연령 ($t_c$) 은 1.171/년과 1.37년으로 구해졌고 현재의 순간어획사망계수는 0.626/년으로 계산되었다. 바지락의 자원량은 총 서식면적 $1.46\;km^2$과 평균 면적당 생체량 1,005.3 g/$m^2$으로 1,483톤으로 추정되었다. 조사해역 바지락의 순간어획사망계수 (F) 에 대한 가입당생산량 (Y/R) 과 어획개시연령 ($t_c$) 과의 관계는 현재의 어획개시연령인 1.37세, 현재의 순간어획사망계수 F 에서 가입당생산량이 1.38 g임을 나타내고 있으며 적정어획사망계수 ($F_{0.1}$)에 의한 연간 생물학적 허용어획량 (ABC) 은 512톤으로 산정되었다.