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명태(Theragra chalcogramma) 이석 내 산소동위원소 조성과 서식 수온 특성
양윤선,강수경,김수암,김순송 한국해양과학기술원 2008 Ocean and Polar Research Vol.30 No.3
Oxygen isotopic composition (d18O) of walleye pollock, Theragra chalcogramma, otoliths were measured to investigate interannual and regional correlation with habitat temperature. Specimens were collected from fishermen in Korea and Japan between 1997~1999, while seawater temperatures were obtained from Korean and Japanese Oceanographic Data Centers. Seawater temperature was generally lower off the eastern Korean Peninsula than off eastern Hokkaido (Japan). Sagittal otoliths were removed for measurement of d18O using a micro-drilling technique. In most cases, d18O and habitat temperature exhibited negative relationship in Korean and Japanese waters. Higher d18O was observed in Korean pollock compared to Japanese pollock. The marginal parts of otoliths exhibited higher d18O than cores from both regions. This is an indication that somatic growth of walleye pollock occurs in deeper and cooler waters. Interannual variation in d18O was also observed. Mean d18O values acquired from 1997 otoliths were lower (2.15‰) than those of 1998 (2.67‰) and 1999 (2.65‰) in Korean pollock. These measurements coincided with changes in observed temperature in Korean waters, in which mean seawater temperature was warmer in 1997 than in 1998 and 1999. In Japanese waters, mean seawater temperature was lowest in 1997, which coincided with highest d18O values in the same year.
동부태평양 한국의 다랑어 연승어업에서 상어류 체중대비 지느러미 중량 비율 추정
안두해,문대연,황선재,김순송,권유정 한국수산과학회 2009 한국수산과학회지 Vol.42 No.2
The National Fisheries Research and Development Institute (NFRDI) conducted a circle hook experiment to compare the catch rates of target and bycatch species between J hook and circle hooks in the tuna longline fishery of the Eastern Pacific Ocean, which is located between 9°13'S-1°36'N and 126°00'-138°21'W. Sampling was conducted from September 20 to October 23, in 2006. In this survey, we collected shark data to obtain the ratio of fin weight to body weight of sharks. Overall, 413 sharks belonging to 9 species were caught on 62,464 hooks. The total weight of the sharks caught was 11,093kg. The ratio of wet fin weight to body round weight of sharks by species ranged from 3.7% to 7.7%, while the mean was 5.4%. The total ratio of wet fin weight to the dry fin weight of sharks ranged 0.38 to 0.70 and the mean value was 0.53. The ratio of dry fin weight to the body round weight of the sharks was estimated to be 2.86%.