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We examined the community structure of fish off the coast of Jindo Island in response to a cold water appearance in the southwestern sea of Korea each August between 2013–2015. Using a gape net with wings, we collected 31 taxa during the study period, wherein the most dominant species was Engraulis japonicus. Collichthys lucidus and Neosalanx andersoni, which are mainly distributed in the western sea of Korea, increased in abundance and were dominant in August 2013, possibly due to the apparent intrusion of cold water ( 20°C) at the coast, which resulted in a noticeable lessening of the cold water in the study area. However, no significant differences were observed in fish community structure in the month of August between 2013–1015. This implies that the small-scale spatial and temporal variations in the cold water had limited effects on the fish community structure, even though the abundances of several dominant species varied in the coastal waters.

상괭이(Neophocaena asiaeorientalis)는 쇠돌고래과(Family Phocoenidae)에 속하는 소형 돌고래로 다른 돌고래류와 달리 등지느러미가 없고 둥근 머리를 가지고 있다(Jefferson et al., 2008). 분포지역은 페르시아와 일본까지 아시아에만 분포하며 최근 연구를 통해, 중국 중남부를 기준으로 아시아 서부 지역 상괭이와 동부 지역 상괭이가 종 수준으로 다르다는 것이 밝혀 졌다(Wang et al., 2008). 상괭이는 멸종위기동식물 국제거래 에 관한 협약(CITES)의 부속서 1에 등재되어 상업적인 거래가 금지된 보호 종이다(CITES, 2014). Park et al. (2007)은 한반 도 서해 연안에 약 36,000마리의 상괭이가 서식하고 있는 것으 로 추정하여 서해 연안이 상괭이의 최대서식지임이 밝혀졌다. 새만금 방조제는 이 서해안에 건설된 세계 최장 방조제(33.9 km)로 전라북도 군산에서 신시도를 거쳐 부안을 연결하였으며 두 개의 하천에 유입되는 담수를 배출하고 해수를 순환시키기 위한 두 개의 갑문을 가지고 있다. 새만금 방조제는2006년에 최종 물막이 공사가 끝났다. 물막이 공사가 끝나고 4년이 지난 2011년 2월, 새만금 방조제 호 안에서 대량 폐사한 상괭이가 발 견되면서 새만금 방조제 호 안에 상괭이가 서식한다는 사실이 처음으로 밝혀졌다 (Hankookilbo, 2011). Park et al. (2012)은 이상 저온으로 새만금호의 수면이 얼어서 호 안의 상괭이 249 새만금호의 상괭이 대량 폐사 후 상괭이(Neophocaena asiaeorientalis) 재출현과 분포 경향 박겸준*·이승용·안용락·김현우·안두해·김두남·김영혜

Vessel-based sighting surveys for cetaceans have been conducted in Korean waters since 2000. The supporting data estimate the abundance of finless porpoises along the west coast of Korea; however, they are insufficient because of the coverage and frequency of the surveys. A preliminary aerial survey was conducted in 2011, and the results were assessed with respect to a sighting survey operated by a research vessel in order to compare effectiveness and potentiality. A total of 110.00 nautical miles of effective efforts were made with three sightings under Beaufort scale 4 in the aerial survey, while the vessel-operated survey covered 403.38 nautical miles over 7 days without any sightings under Beaufort scale 4. The standard deviation of the altitude in this survey was 22.7 m, which was significantly higher than that of the referenced study of 4.3 m.

) trap fishery on the East Sea, Korea. We carried out field experiments and tankexperiments to verify the fishing efficiency and bycatch with the different 8 types of trap. 4 of them hadmesh size 20, 35, 55 respectively and 75mm, 2 of them with escape ring of diameter 30mm and 50mm and 2of them with escape device. The gap was 20 and 40mm respectively. The mesh sizes of the traps with ringand frame were 20mm. The traps with mesh size 20 and 35mm were not reasonable because it could fishunder 300g octopus as bycatch which is not permitted by the Korean fisheries regulations. The catch numberof octopus over 300g by traps with escape ring of diameter 30mm was 53. The catch of trap with mesh size20mm was 54. The catch of trap with mesh size 35mm was 53. There is no significant difference amongthem. The catch number of octopus over 500g that is fishermen˜s favorite one was 46 in the trap with escapering. The diameter of was 30 mm and the catch of trap with mesh size 20mm was more 3 catch and the catchof trap with mesh size 35mm had 6 more catch. Fishermen wanted to catch over 500g octopus because the