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한국 연근해에 출현하는 태평양참다랑어 Pacific bluefin tuna, Thunnus orientalis 의 식성
조헌주 ( Heon Ju Jo ),이성일 ( Sung Il Lee ),김두남 ( Doo Nam Kim ),이미경 ( Mi Kyung Lee ) 한국수산해양기술학회(구 한국어업기술학회) 2019 수산해양기술연구 Vol.55 No.1
The feeding habits of Pacific bluefin tuna, Thunnus orientalis were analyzed using samples by large purse seine fishery in Korean waters from 2012 to 2017. The number of samples was 1,274 and the fork-length (FL) ranged from 34.6 to 218.0 cm. According to %IRI, the Important main prey items of immature individuals (below 91.4 cm in FL) were Pisces, Cephalopoda and Euphausiacea and those of mature individuals were Cephalopoda and Pisces. T. orientalis showed ontogenetic changes in prey item that Pisces was dominated in size class of 30-89 cm (FL), Cephalopoda in 90-179 cm (FL), and Pisces above 180 cm. As for seasonal changes in prey item, Cephalopoda was dominant in spring and Pisces was dominant in summer, autumn and winter. %F, %N, %W and %IRI cluster analysis divided area into three groups: Group A was dominated by Pisces; Group B was dominated by Cephalopoda, and Group C was dominated by Euphausiacea.
김은지(Eun-Ji KIM),조헌주(Heon-Ju JO),안지은(Ji Eun AN),오서연(Seo Yeon OH) 한국수산해양교육학회 2023 水産海洋敎育硏究 Vol.35 No.6
The purpose of this study is to analyze the effect of production on the Oliver flounder by estimating the production function. The Cobb-Douglas model was used for the analysis, and the dependent variable was production, and the independent variable was the number of workers, water, electricity, quantity of juvenile, feed, quarantine, and local dummy. Returns to Scale and marginal products of each factor of production were analyzed. As a result of the analysis of the production function, the number of workers, electricity, quantity of juvenile, and regions were found to be factors affecting the production of Oliver Flounder. As a result of the analysis of marginal products, it was confirmed that the aquaculture of Oliver flounder was labor-intensive and had different quarantine effects by region.
우리나라 대형선망어업에서 어획된 태평양참다랑어의 CPUE 표준화(2003-2016)
이성일 ( Sung Il Lee ),김두남 ( Doo-nam Kim ),이미경 ( Mi-kyung Lee ),조헌주 ( Heon-ju Jo ),구정은 ( Jeong-eun Ku ),김중진 ( Jung-jin Kim ) 한국어업기술학회 2018 수산해양기술연구 Vol.54 No.2
Pacific bluefin tuna (Thunnus orientalis) has been mostly caught by the Korean offshore large purse seine fishery in Korean waters. The annual catch of Pacific bluefin tuna caught by the offshore large purse seine fishery in Korean waters showed less than 1,000 mt until the 1990s except for 1997. The catch sharply increased to 2,401 mt in 2000 and recorded the highest of 2,601 mt in 2003, but the catch has generally decreased with a fluctuation thereafter. The main fishing ground of Pacific bluefin tuna of this fishery is formed around Jeju Island. However, it expanded to the Yellow Sea, the coastal of Busan, and the East Sea, which depends on the migration patterns of Pacific bluefin tuna by season. The CPUE standardization of Pacific bluefin tuna was conducted using Generalized Linear Model (GLM) to assess the proxy of the abundance index. The data used for the GLM were catch (weight), effort (number of hauls), catch ratio of Pacific bluefin tuna, moon phase by year, quarter and area. The standardized CPUE from 2004 to 2011, except for 2003 and 2010, showed a steady trend, and then increased until 2014. The CPUE in 2015 decreased, and in 2016 was higher than that in 2015. The result of GLM suggests that the effect of the catch ratio of Pacific bluefin tuna is the largest factor affecting the nominal CPUE.