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Stock assessment of the goldeyes rockfish Sebasetes thompsoni in the Ulleungdo area
허요원,이재봉,양재형,이해원,차형기,장창익 한국수산해양기술학회 2017 수산해양기술연구 Vol.53 No.1
This study researched the population of ecological characteristics of the goldeyes rockfish Sebasetes thompsoni sampled by gill net in the Ulleungdo area from February 2013 to February 2014 in order to assess the current stock status and provide scientific advice for management implementation. The instantaneous coefficient of total mortality (Z) was 0.78/year and the survival rate (S) was 0.459. The instantaneous coefficient of natural mortality (M) was 0.461/year. Based on the estimates of Z and M, the instantaneous coefficient of fishing mortality (F) was 0.318/year. The age at first capture (tc) was 4.41/years. Current Yield-per-recruit (YPR) was 30.83 g, and fishing mortality at maximum YPR (Fmax) and fishing mortality corresponding to 10% of the maximum slope in YPR curve (F0.1) were 3.257/year and 0.673/year, respectively. F35% and F40%, indicating fishing mortalities at 35% and 40% of maximum Spawning biomass-per-recruit (SBPR), were 0.619/year and 0.509/year, respectively. Based on the biological reference points, fishing mortality at overfished threshold yield (FOTY) was calculated as 0.509/year. Current SBPR/SBPRMSY was 1.313 above 1.0, which means ‘not overfishe,’ while current F/FOTY was 0.629 below 1.0, which indicates ‘not overfishing.’ In conclusion, the current status of goldeyes rockfish was located in green zone (i.e., not overfished and not overfishing) according to the revised Kobe plot.
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울릉도 및 독도 근해의 불볼락(Sebastes thompsoni)의 연령과 성장
허요원 ( Yo Won Heo ),이재봉 ( Jae Bong Lee ),양재형 ( Jae Hyeong Yang ),차형기 ( Hyung Kee Cha ),김중진 ( Jung Jin Kim ),장창익 ( Chang Ik Zhang ) 한국수산과학회 2015 한국수산과학회지 Vol.48 No.6
We studied the characteristics of age and growth of the Goldeyes rockfish Sebasetes thompsoni in the Ulleungdo and Dokdo areas by using 730 otoliths from February 2013 to February 2014. The lowest value of the marginal index was found in June once a year. The spawning period was estimated as April. Therefore, the duration from fertilization to the complete formation of the first annual growth ring is fourteen months. From the parameters calculated using the weighted average length of the year ring formation, the growth of S. thompsoni was demonstrated by the von Bertalanffy growth equation as Lt=34.68(1-e-0.2113(t+0.7683)) for females and Lt=29.79(1-e-0.2163(t+1.7964)) for males, Lt=32.84(1- e-0.25(t+0.57)) for combined sex. Comparing with growth performance index(Φ) from these 4 offshore areas, parameter of S. thompsoni in Ulleungdo area was 2.4087, that of in Tong-yeong was 2.2835, that of in Aomori was 2.4077 and in Niigata was 2.3927. As a result, the value of Dokdo and Ulleungdo areas showed the highest.
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양우성,이재봉,허요원,권대현,최석관,정상덕,안두해 한국수산해양기술학회 2017 수산해양기술연구 Vol.53 No.4
This study aims to suggest the methodology to improve to estimate back-calculated fish growth parameters using weighted average. It is to contribute to correct errors in the calculation of back-calculated growth equation with unequal numbers of sample by age. If the numbers of sample were evenly collected by age, each back-calculated length at age was equal between arithmetic and weighted averages. However, most samples cannot be evenly collected by age in reality because of different catchability by fishing gear and limitation of environment condition. Therefore, the estimation of back-calculated length by weighted average method is essential to calculate growth parameters. There were some published growth equations from back-calculated length using a simple arithmetic average with different numbers of samples by age when searching for back-calculated growth equations from 91 relevant papers. In this study, the process of deriving growth equation was investigated and two different average calculations were applied to a fish growth equation, for example of Acheilognathus signifer. Growth parameters, such as ∞ , and , were estimated from two different back-calculated averages and the growth equations were compared with growth performance index. Based on the correction of back-calculated length using weighted average by age, the changes by female and male were -14.19% and -5.23% for ∞ , and 59.28% and 18.91% for , respectively. The corrected growth performance index by weighted average improved at 7.05% and 2.46% by female and male, respectively, compared to the arithmetic averages. 수산자원의 성장식 연구는 수산자원 연령구조를 파악하고 자원 상태를 평가하는데 있어 기초적이고 중요한 분야이다. 따라서 가장 적합한 방법과 모델을 선택하여 성장식을 추정하는 과정은 수산자원의 생물학적 특성을 알아내는 의미뿐만 아니라 자원량 산정 및 정도 높은 자원평가를 수행하는데 있어 오차를 줄이고 정확한 평가결과를 도출하기 위해 중요하다. 이에 본 연구에서는 가중평균을 활용하여 역계산체장 및 성장식에 오차를 줄이고 더 정확한 값을 산정함으로써, 과거 수행되어진 연구자료를 비판하기 위한 목적이 아니라, 앞으로의 정확한 수산자원평가 수행을 위해 보다 바람직하게 개선된 값을 입력자료로 제공하기 위한 방법론을 제시하고자, 산술평균이 적용되어 있는 묵납자루의 연령성장(Baek et al., 2002)의 연구결과 토대로 가중평균법을 적용하여 역계산 체장 또는 체중 성장식을 추정하였다. 산술평균이 적용된 연구에 가중평균이 적용되었을 때 성장계수 추정치는 암컷에서 L_(∞ )값은 -14.19%, K 값은 59.28%차이를 나타냈으며, 수컷에서는 L_(∞ )값은-5.23%, K 값은 18.91%로 차이를 보였다. 그리고 t_(0 )값은 암컷에서 46%, 수컷에서 36%로 차이가 확인되었다. 이를 토대로 성장률(GPI값)을 비교했을 때 암컷에서 7.05%, 수컷에서 2.46% 개선된 것을 확인할 수 있었다.
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울릉도 연안에 서식하는 불볼락(Sebastes thompsoni) 성숙과 산란
양재형 ( Jae Hyeong Yang ),이재봉 ( Jae Bong Lee ),이해원 ( Hae Won Lee ),차형기 ( Hyung Kee Cha ),김소라 ( So Ra Kim ),허요원 ( Yo Won Heo ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.3
We investigated the maturation and spawning of Sebastes thompsoni in the coastal waters off Ulleungdo, based on samples collected by gill net from March 2013 to February 2014. We analyzed monthly changes in maturity stage, gonadosomatic index (GSI), egg diameter, fecundity, and total length (TL) at 50% group maturity. The average TLs of female and male S. thompsoni were 22.6 cm and 22.5 cm, respectively. The main parturition period of females was during March and April. The GSI of females began to increase in January, and reached a maximum in March. The GSI of male reached a maximum between January and February. The spawning period of males was shorter than that of females. The egg diameter during gestation stage was 1.4±2.1 mm. The TL of females at 50% group maturity was 22.3 cm.
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