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RISS 인기검색어
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- 저자 : 정상덕 ( Sangdeok Chung ) (검색결과 2 건)
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정상덕 ( Sangdeok Chung ),차형기 ( Hyung Kee Cha ),이재봉 ( Jae Bong Lee ),이해원 ( Hae Won Lee ),양재형 ( Jae Hyeong Yang ) 한국어업기술학회 2015 수산해양기술연구 Vol.51 No.4
Species composition in the coastal waters off Ulleungdo of Korea were examined based on catches bimonthly collected by trammel net in 2013. A total of 711 individuals and 181.9 Kg were caught and catches were composed of 4 classes 15 orders 27 families 52 species including 44 Pisces, 4 Gastropoda, 3 Cephalopoda, and 1 Echinodermata. The dominant species in biomass were File fish (Thamnaconus modestus), Atka mackerel (Pleurogrammus azonus), and Greenling (Hexagrammos otakii). Data were summarized using hierarchical cluster analysis (HCA) and detrended correspondence analysis (DCA) to examine similarity in species composition for each month, and community structure in Ulleungdo was divided into two groups. Community structures in February, April and December with low temperature and well-mixed surface water were distinguished from those in June, August and October with high temperature and strong stratification, which could be attributed to temporal changes in dominant species. Atka mackerel and Spear squid mainly caught in February and April, disappearing in June, August and October, and File fish outburst was shown in October. Because the water off Ulleungdo has been under low human pressure, it could be a good case study to elucidate effects of climate change on community structure and ecosystem in the East sea. Continuous surveys and further studies are required to demonstrate migration route and distribution of dominant species and long-term changes in community structure in the water of Ulleungdo.
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한국 서남해 민어 (Miichthys miiuy)의 성숙과 산란
이승환 ( Seung Hwan Lee ),정상덕 ( Sangdeok Chung ),김영혜 ( Yeong Hye Kim ),유준택 ( Joon Taek Yoo ) 한국어류학회 2017 韓國魚類學會誌 Vol.29 No.2
본 연구는 우리나라 주요 수산자원 중 하나인 민어의 성숙과 산란을 추정하였다. 연구에 사용된 민어는 2015년 8월부터 2016년 12월까지 우리나라 서해 남부 연안에서 안강망으로 어획되어 양육된 것으로 총 453개체 중, 암컷 229개체, 수컷 211개체를 사용하였다. 성숙도와 생식소숙도지수의 월 변화 결과 민어의 산란기는 8~10월, 주산란기는 9월로 추정되었다. 50% 이상 개체가 생식 가능한 군성숙도를 살펴본 결과 암컷의 군성숙전장은 54.8 cm, 수컷은 49.0 cm로 조사되었다. We investigated maturation and spawning of Miichthys miiuy in the south-western water of Korea, based on samples collected by stow net from August 2015 to December 2016. We analysed monthly changes in maturity stage, gonadosomatic index (GSI), total length (TL) at 50% group maturity. The spawning period was August to October. We estimated the TL at 50% group maturity as 54.8 cm for females and 49.0 cm for males.
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