한국 서해남부 해역에 분포하는 넓적뿔꼬마새우 (Latreutes planirostris) 의 생식생태 및 개체군 동태

오철웅 ( Chul Woong Oh ),마채우 ( Chae Woo Ma ),나종헌 ( Jong Hun Na ) 한국수산과학회 2003 한국수산과학회지 Vol.36 No.2

N/A Reproductive biology and population dynamics of Latreutes planirotris were investigated on the south western waters of Korea, from June 2001 to May 2002. This paper describes sex ratio, population growth, and reproductive aspects of Latreutes planirostris. Brood size was an isometric function of female carapace length. Based on dry weight, reproduction effort (mass of eggs/mass of female) averaged 0.23 Ovarian examination showed that there was significantly higher gonadosomatic index from May to September, with a peak in June. Statistical analysis revealed that the ovarian dry weight of females with eyed eggs was significantly higher than that of those with non-eyed eggs. This suggests that females were potentially consecutive breeders. Sex ratio showed that female is more numerous than male. Growth parameters, mortality, and recruitment were estimated by monthly length-frequency data. Growth parameters were estimated, using the seasonalized von Bertalanffy growth function model (L_∞ = 12.70 mm CL, K=0.87yr^-1, C = 0.96, WP = 0.59). The recruitment pattern was twice a year.

완도 해역의 새우조망어업에서 발생한 부수어획물의 계절적 변동

오철웅 ( Chul Woong Oh ) 한국수산과학회 2010 한국수산과학회지 Vol.43 No.1

새우류 어업에서 어구의 망목 크기가 부수어획량에 미치는 영향

오철웅(Chul Woong OH) 한국생태공학회 2012 한국생태공학회지 Vol.3 No.1

The composition of shrimp and bycatch species caught by two fishing gears (shrimp beam trawl and single-walled tangle net) in the shrimp fisheries of Korea was examined from the major fishing ground during two years between October 2002 and September 2004. A total of 127 species was observed in shrimp trawl and a total of 70 species in single-walled tangle net. These samples were occupied by 74.2% of shrimps, 11.6% of fishes, 7.5% of other crustacens and 4.2% of shellfishes in shrimp trawl, and 88.9% of shrimps and 10.4 % of fishes in single-walled tangle net in terms of total numbers. These samples were occupied by 36.1% of fishes, 25.8% of shellfishes and 14.4% of shrimps in shrimp trawl and by 64.5% of shrimps, 32.7% of fishes in single-walled tangle net in terms of total catch weight. Main bycatch calculated by biomass was Chaeturichthys stigmatias (21.6%), Rapana venosa (21.1%) and Charybdis japonica (12.5%) in beam trawl, and Collichthys lucidus (14.7%), Thryssa kammalensis(11.4%) and Setipinna taty (10.0%) in single-walled tangle net. During the study period, the bycatch-to-shrimp ratio of shrimp beam trawl and single-walled tangle net were 0.87 and 0.24, respectively. Experiment of gear selectivity with increasing mesh size from mesh size in present use to 50% and 100% increase of its mesh size, showed that 50% selectivity size increased and bycatch-to-shrimp ratio are reduced. Measures to reduce the bycatch proportion in the shrimp fisheries are discussed with various management options.

분야별 특별강연 : 해양생물 분야 ; 포스터발표 ; Growth and Reproductive Biology of the Freshwater Shrimp Exopalaemon modestus ( Decapoda : Palaemonidae ) in A Lake of Korea

오철웅(Chul Woong Oh),서해립(Hae Lip Suh),마채우(Chae Woo Ma),정인주(In Ju Jeong),김장영(Jang Young Kim) 한국국제경제학회 2001 한국국제경제학회 학술대회발표 논문집 Vol.2011 No.3

우리나라 서해남부해역의 새우류 어획물에 대한 자원생물학적 연구 1 . 어획물조성과 젓새우류의 산란시기

오철웅(Chul Woong Oh),정인주(In Ju Jeong) 한국수산과학회 2002 한국수산과학회지 Vol.35 No.3

우리나라 새우류 생산의 45% 이상을 차지하는 서해남부해역의 새우어업에 대한 어획물 조성 뿐만 아니라 주요 어획대상종인 젓새우류 (A. japonicus, A. chinensis)의 자원생물학적 특성치로서 성비, 체장과 체중 및 포란수와의 상관관계와 그들의 산란시기를 조사하였다. 어장에서 이용되는 주머니얽애그물의 어획물을 2000년 3월부터 2001년 2월까지 매월 채집하였다. 총 59종이 출현하였으며 새우류 14종, 어류 34종, 기타 갑각류 8종 및 두족류 3종으로 나타났다. 조사기간동안 새우류에 대한 부수어획물의 비는 2000년 4월에 2.42로 가장 높게 나타났으며, 2000년 8월과 2001년 2월을 제외하고 전 기간동안 1 미만으로 나타났다. 이러한 결과는 다른 지역이나 다른 국가에서 행해지는 새우어업과 비교해 볼 때 본 어법은 새우류에 대한 어구선택성이 탁월하고 다른 어종에 미치는 영향이 작다는 것을 지적해 주고 있다. 본 연구지역에서 출현량이 가장 많은 분류군은 젓새우류 (Acetes japonicus, A. chinensis)로 나타났다. 이들의 평균 성비는 젓새우의 경우 1.44±0.42, 중국젓새우의 경우 1.44±0.43으로 나타나 두 종 모두 암컷이 더 많이 출현하는 경향을 보여주었으며, 특히 8월에 암컷의 비율이 가장 높게 나타났다. 젓새우의 평균 포란수는 4,812±1,511개로 나타났으며, 중국젓새우의 평균 포란수는 5,561±1,900개로 나타났다. 두 종에 있어서 성숙한 암컷개체는 5월에서 8월까지 나타났다. 또한 생식소 숙도지수 (GSI)는 7월과 8월에 높게 나타났으며, 7월에 가장 높은 것으로 나타났다. 이러한 결과는 그들의 산란시기가 여름이라는 것을 지적해 주고 있다. Investigations were made on catch composition, sex ratio, relationships between carapace length, body weight and fecundity and spawning season of major target shrimps (Acetes chinensis, A. japonicus) in the shrimp fishing areas of south-western coastal waters, accounting for about 45% of annual shrimp landings in Korea. Catches were collected monthly in the fishing areas from March 2000 to February 2001, using single pocket-walled fishing gear. Total 59 species (shrimps 14, fishes 34, other crustaceans 8 and cephalopods 3 species) occurred. During the study period the bycatch-to-shrimp ratio of shrimp fishery was 2.42 in April 2000 and less than 1 for all months except for August 2000 and Febuary 2001. Compared with shrimp fishery of other areas and nations, these results indicate that effect of the fishing gear on catches of other species is minor, suggesting higher gear selectivity for shrimps. Of shrimps, there were two dominant species (A. chinensis, A. japonicus). Average sex ratio was 1.44±0.42 for A. japonicus and 1.44±0.43 for A. chinensis, which are dominant females in August. Average fecundity was 4,812±1,511 for A. japonicus and 5,561±1,900 for A. chinensis. In the two species mature females were found in the period from May to August. Similarly, the gonadosomatic index (GSI) was higher in July and August, with a peak in July. These results indicate that their main spawning season was summer.

십각기생등각류 진흙새우아감벌레(Argeia pugettensis)가 진흙새우(Argis lar)의 성장과 생식에 미치는 영향

서영석 ( Young Seok Seo ),오철웅 ( Chul Woong Oh ),김아름 ( Ahreum Kim ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.4

The effect of a bopyrid isopod Argeia pugettensis, on the growth and reproduction of the Kuro shrimp Argis lar was investigated. A commercial caridean shrimp in the East Sea of Korea, A. lar, was sampled monthly off Pohang with a bottom trawl from July 2009 to June 2011. During the study period, 7,988 individuals were sampled. These shrimp were parasitized by a bopyrid isopod Argeia pugettensis. The overall infection rate was 3.3%, although it declined in the larger size classes. It did not change monthly. The carapace lengths of the host and parasite were positively cor- related. There was a significant difference in growth between infested and non-infested shrimp. The infested shrimp also had a lower gonadosomatic index (GSI) and breeding rate. These results suggest that the parasites affected the growth and reproduction of Argis lar.

암반조간대 연체동물 지리적 분포에 대한 온도의 영향

이종욱(Jong Uk Lee),오철웅(Chul Woong Oh),손민호(Min Ho Son),김대익(Dae Ik Kim) 한국패류학회 2017 The Korean Journal of Malacology Vol.33 No.2

Temperature is the major environmental factor to determine the geographical distribution, species diversity and community structure of most living organisms. We hypothesized that temperature is being one of the environmental factors to determine community structure of the mollusks living in the intertidal zone of the rocky shore in the Jeju Island. For examination of our hypothesis, we sampled and analyzed mollusks quantitatively and seasonally at the 12 stations along the coast of Jeju Island from June 2011 to February 2012. Surface sea water and atmospheric temperature were used as temperature variables to analyze the correlation between community structure and temperature. The Jeju coast was divided into two areas (North-West area: lower temperature, South-East area: higher temperature) based on the surface sea water which was significantly different between the two areas (p < 0.05). There was no significant correlations, however, between community structure and temperature, and no significant difference (North-West and South-East areas) in the three variables (number of species, density and biomass) of the community structure between the two areas (p > 0.05). The foregoing hypothesis, therefore, was rejected based on the present results in the Jeju Island. Species diversity, which is based on the number of species, was higher in the South-East area than in the North-West area. Although temperature is not likely to be a provable factor to increase the species diversity in the intertidal malacofauna in the coast of Jeju Island, it could be affecting the community structure via interaction which the other factors such as grazing, salinity, dessication and tidal action.

새뱅이와 넓적뿔꼬마새우의 생식생물학적 연구

정인주 ( In Ju Jeong ),오철웅 ( Chul Woong Oh ),마채우 ( Chae Woo Ma ) 한국수산과학회 2006 한국수산과학회지 Vol.39 No.suppl1

천수만에 서식하는 대형저서동물의 춘계와 하계의 군집구조 및 건강도 평가

정래홍,서인수,이원찬,김형철,박상률,김정배,오철웅,최병미,Jung, Rae-Hong,Seo, In-Soo,Lee, Won-Chan,Kim, Hyung-Chul,Park, Sang-Rul,Kim, Jeong-Bae,Oh, Chul-Woong,Choi, Byoung-Mi 한국해양학회 2014 바다 Vol.19 No.4

본 연구는 천수만에 서식하는 대형저서동물의 군집구조를 파악하고, 건강도를 평가하는데 목적이 있다. 천수만 해역에서는 총 224종/$5.2m^2$과 1,940개체/$m^2$의 대형저서동물이 출현하였고, 다모류가 111종(평균 $22{\pm}11$종)과 31,525 개체(평균 $1,213{\pm}1,080$개체/$m^2$)의 밀도를 나타내 가장 우점하는 생물이었다. 천수만의 주요 우점종은 이매패류의 아기반투명조개(Theora fragilis), 다모류의 Heteromastus filiformis, 긴자락송곳갯지렁이(Lumbrineris longifolia), Mediomastus californiensis 및 옆새우류의 Eriopisella schellensis 등이었다. 출현 종의 개체수 자료를 기초로 다변량분석(집괴분석과 다차원배열법)을 실시한 결과, 천수만 해역의 대형저서동물 군집은 크게 2개의 그룹(죽도를 중심으로 만의 안쪽해역 정점군과 만의 입구부해역 정점군)과 2개의 정점(춘계와 하계의 정점 2)으로 구분되었다. 한편 천수만의 건강도를 평가하기 위하여 Benthic Pollution Index(BPI)와 ATZI's Marine Biotic Index(AMBI)지수를 이용하였다. 조사기간 동안 BPI지수는 11(bad status, 가장 불량한 상태)~92(high status, 가장 양호한 상태)의 범위를, AMBI는 1.34(good status, 양호한 상태)~4.39(poor status, 불량한 상태)의 범위를 나타내었다. 결론적으로 천수만은 건강도 지수의 평균 값에 있어 BPI와 AMBI지수가 각각 중간 상태(moderate status, 불량과 양호한 상태의 전이단계)와 양호한 상태를 반영하고 있었다. This study was performed to investigate the community structure and health assessment of macrobenthic assemblages in Cheonsu Bay, West Coast of Korea. Total species number was 224 and mean density was $1,940ind./m^2$, both of which were dominated by polychaete worms (111 species and $1,213ind./m^2$). In terms of density, the major dominant species were the bivalve Theora fragilis ($280{\pm}213ind./m^2$), the polychaetes Heteromastus filiformis ($254{\pm}218ind./m^2$), Lumbrineris longifolia ($216{\pm}41ind./m^2$), Mediomastus californiensis ($158{\pm}97ind./m^2$) and the amphipod Eriopisella sechellensis ($167{\pm}100ind./m^2$). As a result of community statistics (cluster analysis and nMDS ordination), the macrobenthic community structure was classified two major groups (inner and mouth of bay) and two stations (station 2 near Ganwol dyke in spring and summer). The Benthic Pollution Index (BPI) and AZTI's Marine Biotic Index (AMBI) were applied to assess the benthic ecological status. During the sampling periods, the BPI Index values varied between 11 (bad status) and 92 (high status). On the other hand, the AMBI Index values was ranged between 1.34 (good status) and 4.39 (poor status). In conclusion, in terms of the mean BPI and AMBI Index values, the ecological status of Cheonsu Bay were moderate status (ecotone stage) and good status, respectively.

황해 대륙붕에 서식하는 중형저서동물 군집 특성

정민규,김동성,강태욱,오제혁,신아영,오철웅,JUNG, MIN GYU,KIM, DONGSUNG,KANG, TEAWOOK,OH, JE HYEOK,SHIN, AYONG,OH, CHUL WOONG 한국해양학회 2022 바다 Vol.27 No.2

This study aims to identify the community characteristics of meiofauna inhabiting the Yellow Sea continental shelf. To this end an annual survey was conducted considering the seasons from 2018 to 2020 at 13 stations with a depth of 18~90 m of the Yellow Sea located at latitudes 35, 36 and 37 degrees north latitude. The survey was conducted in three seasons of spring, summer, and autumn at 5 stations in October 2018, 9 stations in April 2019, and 6 stations in August 2020 was used to collect 3 repetitions at each station. The habitat density of meiobenthos in the surveyed area was in the range of 45~1029 inds./10 cm², which was similar to the previous studies conducted in the Yellow Sea. The density of meiobenthos according to the seasons was 800±69 inds./10 cm² in autumn, the highest, and the lowest at 260±48 inds./10 cm² in summer. A total of 19 taxa appeared in meiobenthos, and the average value showed the number of nine taxa. Among the appearing taxa, the most dominant taxon was nematodes, accounting for 80.8% of the total density, followed by benthic copepods (8.8%) and benthic foraminifers (4.7%). As for the size distribution of medium benthic animals, the density of organisms corresponding to the size of 63~125 ㎛ was the highest, and 1~0.5 mm was the lowest. As for the vertical distribution in the sediments of medium benthic animals, the habitat density gradually decreased as the depth increased in the sediment surface layer. As a result of analysis of the N/C ratio, MPI, and ITD index using medium-sized benthic animals to identify the benthic environment, there were differences by season, but no values indicating pollution overall.