• Animal Systematics, Evolution and Diversity
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• 제32권4호
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• pp.272-280
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• 2016

Most scyphomedusae jellyfishes recorded in Korean waters are temperate and subtropical species. In the present study, two cold-water jellyfishes from Korean waters are first described. Scyphomedusae were collected from the coasts of Gangneung and Ulsan of the East Sea, and Boryeong, and the eastern area of the Yellow Sea from June 2006 to May 2015. Scyphomedusae collected in Ulsan and Gangneung were identified morphologically as Aurelia limbata Brandt, 1835. Their umbrella was 250-500 mm in width and 30-50 mm in height; the exumbrella was white and the subumbrella was dark brown in color. The vascular system was complex with anastomosed branches. Individuals of this species lived at about 6.6-9.9℃ and 30-50 m depth in Korean waters. Scyphomedusae collected from the center of the Yellow Sea and from Boryeong were identified as Parumbrosa polylobata Kishinouye, 1910. Their umbrella was disc-shaped, 80-200 mm in width and 20-40 mm in height. Its milky white gonads could be seen through the transparent exumbrella. The stomach cavity was round and flat with four interradial cavities connected by subgenital cavities, and the four oral arms were bifurcated and spear-head shaped. Individuals were found at about 6.4-10.0℃ and 40-90 m depth in Korean waters. The identities of both species were confirmed by molecular analysis using nuclear ribosomal DNA sequences.

• 수산해양기술연구
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• 제49권3호
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• pp.250-260
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• 2013

The annual and monthly fluctuation in the species composition and the catch abundance of dominant species were analyzed using the daily sales slip catch data by a set net in the offshore waters off Dolsan Island in Yeosu from March 2004 to December 2011. Mean catch from 2004 to 2011 is 372M/T and the maximum and the minimum catch are 526 M/T in 2005 and 27 2M/T in 2009, respectively. The dominant species were Engraulis japonicus mainly in spring and Scomberomorous niphonius in Autumn and therefore the set net catch that is dominated by S. niphonius's catch was much higher in autumn than in spring. Through comparative analyses for the environmental factors to the annual catch fluctuation, it is revealed that the water temperature variation affected the recruitment property of S. niphonius to the fishing ground but the effect of typhoon on the catch fluctuation was not distinct. Furthermore, the big blooming event of jellyfish, particularly Nemopilema nomurai, that occurred in 2009 showed a tendency of faster appearance and later extinction until December. The occurring characteristic of N. nomurai became a direct cause that brought about the lowest total catch in 2009 since the dominant species catch of the set net fishery was concentrated mostly in Autumn.

• 전기학회논문지
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• 제57권9호
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• pp.1606-1611
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• 2008

Recently, The diagnosis techniques of electric facilities are developed on live line. This paper describes the discharge characteristics of polymer insulator(EPDM A type). Keeping the facilities in good working order, the goal of this paper will provide the information to enable user to easily judge conditions of facilities on the spot. The performance of polymer insulator is assessed from the KS C IEC 60270 and CEA LWIWG-01(96)(Tracking Wheel Test). As the results, UV generation patterns of polymer insulator grow like a jellyfish shape follow the ramping voltage. Discharging UVs are detected at about 31.25% of breakdown voltage. Just then, dimension of UV image is about $0.84cm^{2}$. The dimension of max. UV image is about $297.4cm^{2}$ at $160kV(V_{bd})$. The position of UV generation due to surface discharge of polymer insulator is the center of insulator in the early, then moved the ground side and the last, UV image moved through the junction part of source side. Surface of aged polymer insulator is cracked and faded due to arc. UV absorption spectrum of polymer insulator are appeared the C-H bond of scissoring vib. at $1014cm^{-1}$ and C=O bond of recombination structure. Also, recombined UV absorption peak such as C-H, N-H, and O-H is detected at the $3321cm^{-1}$. Through the paper, there are inspection data which are the relations between surface discharge of polymer insulator and UV detecting image.

• 동아시아식생활학회지
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• 제27권4호
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• pp.387-398
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• 2017

We attempted to develop a seafood menu by applying the most preferred recipes to the most disliked seafood menus in order to improve elementary schoolers' seafood menu preferences and consumption levels. A survey was conducted on the attitudes of 106 fifth graders about nine cooking methods and 37 school seafood menus served in the past 2 years. The deep-frying method was the most preferred by both boys and girls. The next preferred methods by boys were grilling and batter-frying while those by girls were stir-frying and batter-frying. The most disliked menus were cold jellyfish salad, mussel soup, dried-pollack soup, and sea-snail salad in that order. Mussel soup, dried-pollack soup, and seasnails salad ranked as the least preferred menu as well. Finally, standardized recipes for mussel croquette, dried-pollack Gangjeong, and batter-fried seasnails were developed. Consumption ratios of mussel croquette (85.94%), dried-pollack Gangjeong (79.55%), and batter-fried seasnails (75.5%) were significantly improved compared to the original menu (p<0.001). For mussel croquette, satisfaction scores for serving size, appearance, flavor, texture, and taste were significantly higher, and intakes of protein, phosphorus, iron, potassium, vitamin A, vitamin B1, vitamin B2, niacin, and vitamin C were significantly improved, as compared with mussel soup (p<0.001). Dried-pollack Gangjeong, texture and taste scores were significantly improved compared to dried-pollack soup. For batter-fried seasnails, protein, phosphorus, and iron intake levels and taste score were significantly improved compared to seasnail salad. Findings of the study suggest that a combination of disliked seafood ingredients and preferred recipes may be helpful in improving elementary school foodservice by increasing menu preference and consumption ratio.

• 대한영양사협회학술지
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• 제25권3호
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• pp.199-216
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• 2019

We conducted this study to compare the awareness and attitude of Busan housewives about consuming marine products. The survey was conducted from April 10 to May 31, 2019 by using a questionnaire. The degree of preference of seafood was higher among individuals in their 40s than those in the other age groups. Among the women in their 30s, 40s, 50s and 70s, the reason for liking seafood was 'taste', and for those in their 60s it was 'nutrition'. Overall the most common reason for disliking seafood was the 'fishy smell (37.4%)'. Conception degree of nutritive value of seafood was higher among individuals in their 30s and 40s than that for those individuals in their 50s, 60s and 70s. As for the price of seafood, the wives over 40s thought seafood was more expensive than did those wives in their 30s. The younger the individuals were, the lower was the perceived degree of safety was 49.8% of the subjects reported that the main concern for purchase was 'freshness'. The perceived degree of safety for imported seafood was better for the wives in their 60s and 70s than that for those wives in their 30s, 40s and 50s. The confidence level for local Korean seafood was higher for the wives in their 60s than that for the wives in their 50s. The degree of preference for seafood was moderate overall, except for Jellyfish. Age was positively correlated with conception for safety and dietary attitude (P<0.01), whereas age was negatively correlated with monthly food expenditure, nutrition knowledge and intake requirements (P<0.01). Preference for seafood was positively correlated with conception for safety (P<0.05), nutrition knowledge (P<0.05), dietary attitude (P<0.01), awareness for nutritive value (P<0.01) and intake requirements (P<0.01). Laws and regulations should be reinforced in order to promote eating more seafood and periodic research to determine the actual amount of consumed seafood and people's preferences should be conducted.

• 수산해양기술연구
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• 제33권4호
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• pp.298-310
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• 1997

마산만의 4개 정점에서 1994년 3월부터 1996년 12월까지 2~3월 간격으로 14회에 걸쳐 21개의통발과 5폭의 저층자망어구를 이용하여 저서어개류의 군집특성을 조사하였다. 통발에 채집된 종은 0~10종으로 불가사리, 게류, 붕장어, 볼락, 노래미, 망둑 및 베도라치 등이었고, 단위 통발당 개체수는 0~46마리였으며 우점종은 S1정점의 납작게와 다른 정점의 불가사리였다. `95년에 출현 종과 개체수가 비교적 많았으나, `94년 3월과 7월 및 `96년 8월에 S1정저메서 생물이 채집되지 않았다. 자망구어에 채집된 종는 0~7종으로 갯가재, 해파래, 도다리, 불가사리, 민꽃게, 및 해조류 등 이었고, 단위 폭당 개체수는 0~30마리였으며 우점종은 해파리와 갯가재엿다, `94년 7월에는 S1정점에서 그리고 `96년 8월 및 12월에는 S4정저메서서 생무링 체포되지 않았으나, `95년 8월과 `96년 8월에는 S1정점에서 고등어, 멸치, 전어, 숭어 등이 저층자망에 포획되기도 하였다. 가장 오염이 심한 S1정점에서 `94년 11월에 통발당 50여 마리의 납작게가 들었으며 이후에도 개체수는 줄었으나 지속적으로 포획되었고, `96년 8월에는 고등어, 숭어, 전어 등의 군집이 빈번하게 형성되었다, 그리고 S1정점에서 도다리, 노래미, 갯가재, 꼼치 등의 치어사 `95년과 `96년의 4~8월에 많이 들었으나 특이하게도 불가사리는 1마리도 채집되지 않았다. 종다양성지수(H`)는 60여회의 조사중 80% 이상이 1.0 이하로 나타났다. 정점별 비교에서 톨발에 의한 군집 안정도는 S1정점에서 가장 낮고 다른 정점에서는 유사한 수준으로 높았지만, 자망의 경우는 S1과 S4정점에서 유사한 수준으로 낮고, S2과 S3정점에서 유사한 수준으로 높게 나타났으며 계절별 큰 차이가 없었다. 그리고 경년별 비교에서 통발의 경우에는 거의 차이가 없으나, 지망의 경우 `95년이 다른 해보다 군의 댜양도가 현저하게 큰 것으로 나타났다. 조사결고를 종합하여 보면 마산만에서의 어개류 군집은 납작게, 해파리, 불가사리, 갯가재 등이 탁월하게 우접하는, 안정도가아주낙은 군집을 하고있는 것으로 나타났다. 그리고 `94년 3월에서 `96년 12월까지 뚜렷한 어개류 서식환경의 개선 징후느 나타나지 않았으나, 마산만에 서식하는 어개류는 이곳의 오염된 서식환경에잘 적응하여 산란.서식하며, 또 회유성 어개류는 주로 외적 요인에 의한 계절 및 경년변동을 하는 것으로 유추된다.

• 해양환경안전학회지
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• 제16권3호
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• pp.307-312
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• 2010

황해의 해양환경, 어업자원 및 증양식에 대한 연구 및 개발을 담당하고 있는 국립수산과학원 서해수산연구소에서 해양생태계 보전의 일환으로 황해의 해양환경에 대한 다양한 모니터링을 실시하고 있다. 현재 서해수산연구소가 황해에서 수행 중인 모니터링은 연안정지관측, 서해해양조사, 서해어장환경모니터링, 국가해양환경측정망, 유해적조모니터링, 한중황해환경모니터링조사 및 해파리모니터링 등이 있다. 이러한 모니터링 결과들은 중요 어족의 어장형성 해역에 대한 기초자료를 제공하여 연근해 어업생산성을 제고하고, 기후변동에 따른 향후 수산자원 변동 예측을 위한 기초자료로 활용되고, 한반도 주변해역의 체계적인 해양과학자료를 제공하여 수산업, 해양환경보전, 해양레저 등 한반도 주변해역의 부가가치 창출에 기여하고 있으며, 연안어장의 지속적 생산을 유지하기 위한 어장환경 관리 및 보전정책 수립을 위한 국가 기본 자료로 활용하고 있다.

• 생명과학회지
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• 제17권3호통권83호
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• pp.318-327
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• 2007

본 연구는 여수연안해역에서 채 집 한 보름달 둥근 물해파리를 대상으로 ITS 부위와 미토콘드리아 유전자 염기서열을 이용하여 계통유연관계를 보왔다. ITS 부위를 증폭시키 기 위하여 F5와 R5 primer, 미토콘드리아 COI 유전자 증폭을 위하여 LCO1490과 HCO2198 primer를 사용했다. 증폭은 ITS에서 267 bp, COI에서 643 bp로 나타났다. 한국산 물해파리와 미국 캘리포니아에서 채집한 Aurelia sp.가 유전적 거리가 가장 짧은 0.023을 보인 반면에, 한국산과 미국산, 스웨덴산 물해파리는 동일한 종이지만 유전적 거리가 0.393에서 0.395로 매우 먼 것으로 나타났다. COI유전자의 경우 한국산과 영국산, 터어키산, 스웨덴산, 미국산 물해파리의 유전적 거리 범위는 0.201에서 0.205로 나타났다. 그러나 한국산과 미국산의 bootstrap은 100% 자매군으로 보였다. COI 유전자에 대한 한국산과 미국산 2차 RNA folding 구조를 볼 때 동일한 에너지 하에서도 상이한 2차 folding을 보였다. 따라서 ITS1과 COI 유전자는 보름달 둥근 물해파리 개체군의 생물지리학적 분포 조사를 위하여 유용한 도구로 활용될 것으로 추측된다.

• Journal of Ecology and Environment
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• 제45권4호
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• pp.203-217
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• 2021

Background: Sea turtles, which are globally endangered species, have been stranded and found as bycatch on the Korean shore recently. More studies on sea turtles in Korea are necessary to aid their conservation. To investigate the spatio-temporal occurrence patterns of sea turtles on the Korean shore, we recorded sampling locations and dates, identified species and sexes and measured sizes (maximum curved carapace length; CCL) of collected sea turtles from the year 2014 to 2020. For an analysis of diets through stomach contents, we identified the morphology of the remaining food and extracted DNA, followed by amplification, cloning, and sequencing. Results: A total of 62 stranded or bycaught sea turtle samples were collected from the Korean shores during the study period. There were 36 loggerhead turtles, which were the dominant species, followed by 19 green turtles, three hawksbill turtles, two olive ridley turtles, and two leatherback turtles. The highest numbers were collected in the year 2017 and during summer among the seasons. In terms of locations, most sea turtles were collected from the East Sea, especially from Pohang. Comparing the sizes of collected sea turtles according to species, the average CCL of loggerhead turtles was 79.8 cm, of green turtles was 73.5 cm, and of the relatively large leatherback turtle species was 126.2 cm. In most species, the proportion of females was higher than that of males and juveniles, and was more than 70% across all the species. Food remains were morphologically identified from 19 stomachs, mainly at class level. Seaweeds were abundant in stomachs of green turtles, and Bivalvia was the most detected food item in loggerhead turtles. Based on DNA analysis, food items from a total of 26 stomachs were identified to the species or genus level. The gulfweed, Sargassum thunbergii, and the kelp species, Saccharina japonica, were frequently detected from the stomachs of green turtles and the jellyfish, Cyanea nozakii, the swimming crab, Portunus trituberculatus, and kelps had high frequencies of occurrences in loggerhead turtles. Conclusions: Our findings support those of previous studies suggesting that sea turtles are steadily appearing in the Korean sea. In addition, we verified that fish and seaweed, which inhabit the Korean sea, are frequently detected in the stomach of sea turtles. Accordingly, there is a possibility that sea turtles use the Korean sea as feeding grounds and habitats. These results can serve as basic data for the conservation of globally endangered sea turtles.

• 한국해양학회지:바다
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• 제15권4호
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• pp.166-175
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• 2010

한강 하구의 강화 갯벌 조간대에서 유영생물의 종조성을 파악하기 위히여 2009년 4월부터 12월까지 매월 1회 강화 석모수로 조간대에 설치된 건간망에 어획된 유영생물을 수집 분석하였다. 채집된 유영생물은 총 57종으로 그 중 어류가 34종으로 가장 많았고, 갑각류 20종, 두족류 2종 그리고 1종의 해파리가 출현하였다. 종조성은 봄과 가을에 다양한 종들이 출현하였으며, 양적으로는 가을에 많았다. 총 어획물중 꽃게 (Portunus trituberculatus)가 전체 개체수의 57.2%를 차지하여 가장 많았고, 다음으로 그라비새우(Palaemon gravieri) 7.1 %, 황강달이 (Collichthys lucidus) 7.0%, 무늬발게(Hemigrapsus sanguineus) 6.2%, 밀새우(Exopalaemon carinicauda) 4.7% 순으로 우점하였다. 우점종 중 가숭어(Chelon haematocheilus), 풀망둑(Synechogobius hasta), 웅어 (Coilia nasus), 그라비새우, 밀새우 등은 기수성 주거종이었으며, 꽃게, 황강달이, 숭어 (Mugil cephalus), 참서대(Cynoglossus joyneri) 등은 하구를 보육 및 성육장으로 이용하는 연안 회유종이었다. 그 외 양적으로는 적지만 황복(Takifugu obscurus), 참게(Eriocheir sinensis), 뱀장어 (Anguilla japonica) 등의 왕복 회유종과 붕어(Carassius auratus) 등의 담수종도 출현하였다.