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가덕도 상괭이(Neophocaena asiaeorientalis)의 분포 및 계절적 변화
박겸준,윤영글,신정호,손호선,최영민,Park, Kyum Joon,Yoon, Young Geul,Sin, Jeong-Ho,Sohn, Hawsun,Choi, Young-Min 한국수산과학회 2017 한국수산과학회지 Vol.50 No.5
Few studies on the finless porpoise Neophocaena asiaeorientalis have been conducted on the south coast of Korea. This region includes Gadeok Island, which is located off the Korean peninsula in an area of heavy maritime traffic. Sighting surveys of finless porpoises were conducted at seven predetermined spots around Gadeok Island in January, May, July, September, and November 2016. Finless porpoises (127 individuals in 24 schools) were sighted at all but one (spot P5) of the survey locations. Fewer porpoises were spotted in summer (Jul and Sep) than in other seasons (P<0.05). Porpoises were most abundant around the south coast of the island, where they were spotted in every season, and in significantly higher numbers than at other locations (P<0.05). Single individuals accounted for 20.8% of sightings, while 25.0% of sighted schools consisted of only two porpoises. The mean school size was 5.29 individuals (SD=6.72).
위성추적장치를 이용한 구조치료 상괭이(Neophocaena asiaeorientalis) 의 이동 모니터링 결과 및 표층수온과의 관계
박겸준 ( Kyum Joon Park ),( Keiko Yamada ),손호선 ( Hawsun Sohn ) 한국수산과학회(구 한국수산학회) 2018 한국수산과학회지 Vol.51 No.4
Little is known about the movements of finless porpoises Neophocaena asiaeorientalis and their relationship with sea surface temperature (SST). A female finless porpoise that was stranded alive on the shore at Busan was rehabilitated for 16 months at the Sea Life Busan Aquarium. The porpoise was released off Geoje Island with a satellite tag on her mid-ridge and tracking data were received for 7 days. The porpoise moved directly to the southern shore of Gadeok Island, where an earlier study reported that finless porpoises were most abundant around the island. The tracking route revealed two other potential primary habitats. The porpoise moved to the middle of the east coast of the Korean Peninsula at Uljin, beyond the distribution boundary known from earlier studies. Satellite infrared images detected a cold water mass off the Uljin coast and the tracking route showed that the porpoise avoided this low-temperature area.
새만금 호의 상괭이 대량 폐사 후 상괭이( Neophocaena asiaeorientalis ) 재출현과 분포 경향
박겸준 ( Kyum Joon Park ),이승용 ( Seung Yong Lee ),안용락 ( Yong Rock An ),김현우 ( Hyun Woo Kim ),안두해 ( Du Hae An ),김두남 ( Doo Nam Kim ),김영혜 ( Yeong Hye Kim ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.6
A mass mortality of 249 finless porpoises Neophocaena asiaeorientalis occurred in the Saemangeum Dyke in February 2011. It was an extraordinary event, notable due to the death toll and the location of the occurrence, a semi-isolated lake enclosed by a man-made structure. We conducted sighting surveys that consisted of a land-based sighting survey recorded from three different platforms, and a ship-based sighting survey in the lake. The land-based survey was dedicated to clarifying the distribution of finless porpoises and whether they passed through two water gates (Shinsi and Garyek) of the dyke from 2011 to 2013. No finless porpoises were observed in the 2011 or January 2012 surveys. In April 2012, two months and one year after the mass mortality, one finless porpoise, swimming 400 m from the Shinsi water gate, was observed by a land-based survey. The number of observed individuals increased to nine in 2012 and reached 10 by May 2013 at the time of the surveys. Most of the porpoises were detected near the Garyek water gate. The density of the animals was 0.075/km2 in 2012 and 0.083/km2 in 2013. The density of porpoises was 2.063/km2 at the time of the mass mortality.
남서대서양 한국 원양 저연승 어선의 조업 분포 및 비막치어(Dissostichus eleginoides) CPUE 변화
박겸준 ( Kyum Joon Park ),최석관 ( Seok-gwan Choi ),안두해 ( Doo-hae An ) 한국수산과학회(구 한국수산학회) 2021 한국수산과학회지 Vol.54 No.1
This study used the commercial fishing data of Korean high sea bottom longline vessels in the South West Atlantic Ocean from 2013 to 2019 to identify the distribution of fishing grounds of Korean longline vessels. We estimated the CPUE of the Patagonian toothfish Dissostichus eleginoides and the changes in its stock status. The fishing grounds of Korean longline vessels were observed to concentrate on the exclusive economic zone (EEZ) boundary between Argentina, Uruguay, and Falkland owing to the high seas of 41-55 °S in the south and 49-60 °W in the west. A high intensity of fishing was seen in the middle area, which was horizontal from the 3.1 subarea. In all the three subareas, CPUEs have had the tendency to decline since 2013. Although the CPUEs in the 3.2.1-2 subareas were the highest in each subarea, there was no significant difference in each subarea (P>0.05). It is believed that the establishment of a regional fisheries organization or the strengthening of the management of FAO is necessary for the management of Southwest Atlantic fisheries and sustainable fishing, because the portion and scope of Korean longline vessels are very low in the Southwest Atlantic; however, the CPUE is estimated to have declined.
새만금에서 발생한 상괭이(Neophocaena asiaeorientalis)의 대량 폐사: 이상 저온에 따른 영향의 증거
박겸준 ( Kyum Joon Park ),안두해 ( Du Hae An ),임채웅 ( Chae Woong Lim ),이태호 ( Tae Ho Lee ),김두남 ( Doo Nam Kim ) 한국수산과학회 2012 한국수산과학회지 Vol.45 No.6
On 3 February 2011, a mass mortality of finless porpoises Neophocaena asiaeorientalis occurred at a dike of the Saemangeum Sea dike. A total of 249 carcasses were collected; these had been stranded by a sea dike and had floated into the lake formed by the dike. Eight bodies were measured, and four of these were dissected to analyze stomach contents. The blubber thicknesses of five bodies were compared with those of caught finless porpoises in the Yellow Sea from 2010. Finless porpoises at the Saemangeum Sea dike exhibited better nutritive conditions than finless porpoises in the Yellow Sea. Air temperature in January 2011 was lower than the prior 5-year average (P<0.05). Water temperature when the mass mortality occurred was lower than values observed in 2009 and 2010: values below 0°C had been recorded, and the majority of the dike lake had frozen over. The mass mortality of finless porpoises may have been caused by these unusually low temperatures.
한국 서해 상괭이 (Neophocaena asiaeorienfalis)의 먹이습성과 섭식량
박겸준 ( Kyum Joon Park ),안용락 ( Yong Rock An ),이영란 ( Young Ran Lee ),박지은 ( Ji Eun Park ),문대연 ( Dae Yeon Moon ),최석관 ( Seok Gwan Choi ) 한국수산과학회(구 한국수산학회) 2011 한국수산과학회지 Vol.44 No.1
We investigated the stomach contents of fin less porpoises collected in the Yellow Sea. Prey organisms in the stomachs of 109 finless porpoises were identified as 11 species of fish, 8 species of shrimp and 4 species of cephalopod. Index of Relative Importance analysis revealed that the porpoises fed mainly on the Japanese sand shrimp (Crangon affinis). The energy density of the prey was estimated to be 5.46 kJ. The daily energy requirement was estimated to be 18,051 kJ/day for a porpoise with an average weight of 32.49 kg. The estimated annual consumption by fin less porpoises in the Yellow Sea was 25,454 tons. The average commercial catch in the Yellow Sea by Korean fisheries was 135,913 tons from 2005 to 2009. Assuming that the abundance of finless porpoises is stable, porpoises ate approximately 18.7% of the commercial catch. The fishery catch may be influenced by the consumption by fin less porpoises, while fishery bycatch is a cause of porpoise mortality in the Yellow Sea.
단보 : 한국 서해에서 상괭이(Neophocaena asiaeorientalis)의항공 조사 타당성
박겸준 ( Kyum Joon Park ),손호선 ( Haw Sun Sohn ),김영혜 ( Yeong Hye Kim ),김두남 ( Doo Nam Kim ),김현우 ( Hyun Woo Kim ),안두해 ( Du Hae An ),안용락 ( Yong Rock An ) 한국수산과학회(구 한국수산학회) 2013 한국수산과학회지 Vol.46 No.6
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 22.7m, which was significantly higher than that of the referenced study of 4.3 m.