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한국 거문도 인근해역의 만새우, Parapenaeopsis tenella의 개체군 동태
오택윤,차형기,최정화 한국어업기술학회 2004 수산해양기술연구 Vol.40 No.1
우리나라의 서해와 남해 연안에 분포하는 민새우는 서해 북쪽으로는 영광에서 남쪽으로 거제도까지 널리 분포한다. 거문도 인근해역에서 채집된 민새우의 암 · 수 성비는 암컷이 48.6% 로 나타났고, 이 개체군은 7월과 8월에 성숙하고, 년 1 회 신생 가입군이 발생되었다. 교미한 개체는 7월과 8월에 출현하기 시작하였고, 갑각정 13mm 이상의 전 출현 암컷의 50% 이상이 교미한 것으로 나타났고, 성숙도지수는 7-8월에 최고치를 나타내었다. 암컷의 최소 성숙개체는 갑각장 11mm이고, 성 성숙과 교미율에 의한 군성숙도 (CL50) 는 각각 갑각장 12.53mm와 12.28mm로 나타났다. 체장 빈도 자료에 의해 추정된 민새우의 수명은 암컷이 14-15개월로 나타났다. 변형된 von Bertalanffy 성장식에 의해 추정된 성장계수(K)는 암 · 수 각각 1.22/년과 2.00/년이고, 최대 갑각장 (L∞)은 암 · 수 각각 21.99mm와 15.00mm이였으며, 암컷이 수컷보다 성장이 빠르고, 큰 것으로 나타났다. Parapenaeopsis tenella occurs widely on the south and west coasts of Korea. Sex ratio showed seasonal variations, with a mean value of 48.6% for the females. The species produces one cohort a year, with the ovaries ripening from July to August. Insemination took place from July to August, as more than half of the females sampled in the study over 14 mm CL were inseminated. Gonadosomatic index (GSI) reached the maximum between July and August. The smallest mature female was 11 mm CL. Size at 50% sexual maturity (CL50), determined from both mature females and inseminated females, was 12.53 mm and 12.28 mm CL, respectively. The life span of females appeared to be 14-15 months according to size frequency distributions, while that of the male was 13-14 months. Population growth was estimated by the modified von Bertalanffy growth function incorporating seasonal variation in growth. Based on the growth parameters (K = 1.22 yr-1 and L∞ = 21.99 mm CL for females, and K = 2.00 yr-1 and L∞ = 15.00 mm CL for males) growth curves showed that females grew faster and reached a larger size at age than males.
오택윤 ( Taeg Yun Oh ),김주일 ( Joo Il Kim ),서영일 ( Young Il Seo ),이선길 ( Sun Kil Lee ),최문성 ( Mun Seung Choi ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.4
This study is to find out the distribution characteristic of Octopus minor in the Tando Bay on the southwest coast of Korea with conducting surveys from May of 2006 to April of 2007. Surveys were carried out at 20 stations on 2 and 3 tide time in the low speed of high tide at night and conducted during 30minutes (4 times fishing) per station. Catch per unit effort (CPUE) was estimated by total catch per 500hooks at each station. Monthly CPUE showed that they put highest in October, November, April and June at 10.4, 10.5, 9.4 and 7.7 individuals respectively. On the other hand, CPUE put lowest in January, the coldest month, and August, the hottest month, at 0.2 and 0.3 individuals respectively. As for geographical mantle length distribution, average mantle length ranged from 6.2cm to 7.3cm at stations near the tidal channels (St. 1, 4, 5, 6, 8, 9, 10, 13, 14, 15, 18, 19 and 20), and was smaller than 6.0cm at stations located inside of bay (St. 2, 3, 7, 11, 12 and 17). In terms of geographical distribution density, CPUE showed higher than 8.0 at St.4 in Changmaeri, St.8 in Taecheonri, St.13 near Seondo, St.18 in Naeri and St.14 in western part of Tando which are located near the main tidal channels. And distribution density showed low that CPUE was lower than 5.0 individuals at stations located inside of bay (St. 1, 3, 5, 6, 7, 11, 12, 16 and 20). Through the results, the difference of distribution density reflects that distribution of Octopus minor is affected by direction of current and inflow of pollutant from land in direct. Therefore, it is considered that bottom composition of tidal flat and distribution of live food are the crucial cause of identifying the distribution characteristics of Octopus minor. For this reason, it is judged to need additional research on it.
영양성분을 고려한 고등어, Scomber japonicus 자원 이용과 관리 방안
오택윤 ( Taeg Yun Oh ),심길보 ( Kil Bo Shim ),서영일 ( Young Il Seo ),권대현 ( Dae Hyun Kwon ),강수경 ( Su Kyung Kang ),임치원 ( Chi Won Lim ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.2
This study analyzed annual catch trend during 45 years and monthly catch of the least 10 years (2005∼2014) for chub mackerel caught in the Korean coastal waters. To determine fishing status of chub mackerel, fork length measurements were conducted at least twice every week for 100 individuals randomly selected at the Busan Cooperative Fish Market from January of 2012 to December of 2014; and biological characteristics and proximate composition (moisture, protein, fat, ash) were analyzed by length class (I∼IV) on a monthly basis from January to December of 2014. Monthly catch trend showed low level below 5,000 mt from February to July, whereas high level above 15,000 mt from October to December. For the period between 2012 and 2014, annual average catch proportion of juvenile were relatively high at 68.1%, 53.1% and 53.2% from January to April, before spawning season, while those were low at 21.5%, 20.7% and 29.12% from June to November. As for the change in the proximate composition per 100 g of muscle, protein and ash did not change much by seasons and length class, whereas fat and moisture contents showed large fluctuations and complementary relationship between the two factors. Regardless of length class, monthly average fat content, containing Omega-3, showed the lowest at 7.18 g in April and highest at 19.27 g in December, which exhibited 2.6 times difference from one another. Regardless of fishing seasons, fat content by length class were 19.06 g for the class I and 6.43 g for the class IV, which showed three times difference. Fat contents of the class I were high at 26.97 g and 27.19 g in November and December, while low at 8.37 g and 9.99 g in April and May. Especially, fat contents from January to May were 5.0 g, which was the lowest. Therefore, it is expected that consumer could indirectly contribute fisheries management through their understanding and wise consumption based on fishing status and fluctuation of proximate composition.
근해오징어채낚기어업에서 어로기술발달에 따른 어획성능지수 변동
오택윤 ( Taeg-yun Oh ),서영일 ( Young-il Seo ),차형기 ( Hyung-kee Cha ),조현수 ( Hyun-su Jo ),안영수 ( Young-su An ),이유원 ( Yoo-won Lee ) 한국수산해양기술학회(구 한국어업기술학회) 2018 수산해양기술연구 Vol.54 No.3
Squid is one of the important fisheries resources in Korea. Therefore, squid has been designated and managed as a target species of total allowable catch (TAC) since 2007, but the catch amount is gradually decreasing. The analysis was conducted to identify the change of relative fishing power index to develop the vessel and gear technology that may have improved the fishing efficiency of the offshore squid jigging fishery from 1960s to 2010s. Gross tonnage per fishing vessel increased with the increase in size until 1990, but then gradually decreased to 41.0 tons in 2000 and 37.1 tons in 2010. The illuminating power (energy consumption) by fishing lamps increased to 180 kW in 2005 and stabilized to 120 kW in 2015. Jigging machine started to be supplied to fishing vessels from the early 1970s, and fish finders began to be supplied in the early 1980s and gradually increased. Therefore, the relative fishing power index in the offshore squid jigging fishery increased from 1.0 in 1980 to 1.1 in 1990, to 3.5 in 2000 and to 2.5 in 2010, but the increment rate slowed down gradually. The results are expected to contribute to reasonable fisheries stock management.