• Parasites, Hosts and Diseases
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• 제54권4호
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• pp.497-502
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• 2016

To know the infection status of zoonotic trematode metacercariae in brackish water fish, we surveyed mullets collected from 18 coastal areas in the Republic of Korea. The metacercariae of Pygidiopsis summa were detected in 236 (68.2%) out of 346 mullets examined. They were found in mullets from 15 areas except for those from Boseong-gun (Jeollanam-do), Pohang-si, and Uljin-gun (Gyeongsangbuk-do). Especially in mullets from Taean-gun (Chungcheongnam-do) and Geoje-si (Gyeongsangnam-do), their prevalences were 100% and 95.5%, and the average metacercarial density was more than 1,000 per fish. They were also detected in mullets from 3 coastal lakes, Gyeongpoho, Songjiho, and Hwajinpoho, in Gangwon-do, and their average densities were 419, 147, and 672 per infected fish, respectively. The metacercariae of 5 other heterophyid species, including Heterophyes nocens, Heterophyopsis continua, Metagonimus sp., Stictodora fuscata, and Stictodora lari, were found in the mullets examined. The metacercariae of H. nocens were detected in 66.7, 100, 28.6, 81.6, 3.9, 61.5, and 27.3% of mullets from Muan-gun, Shinan-gun, Haenam-gun, Gangjin-gun, and Boseong-gun (Jeollanam-do), Hadong-gun, and Geoje-si (Gyeongsangnam-do), and their metacercarial intensities were 64, 84, 119, 99, 1, 24, and 24 per fish infected, respectively. From the above results, it has been confirmed that P. summa metacercariae are heavily infected in mullets from coastal areas of Korea. It is suggested that residents who frequently consume raw mullet dish can be easily infected with heterophyid flukes.

• 한국어류학회지
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• 제5권2호
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• pp.184-193
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• 1993

서해의 아산만, 천수만과 영광 근해, 남해의 삼천포 근해 및 동해의 영일만에서 otter trawl로 민태를 채집하여, 계절에 따른 밀도 분포, 체장 및 연령 조성을 분석하였다. 영광근해에서는 민태의 평균밀도가 1.147개체/$10,000m^2$로 높은 생물량을 보였고, 저어류 군집을 우점하였다. 천수만에서는 평균밀도가 94개체/$10,000m^2$, 아산만과 삼천포에서는 이보다 낮아 8-24개체/$10,000m^2$였다. 영광 근해에서 서해의 북쪽 혹은 남해의 동부로 갈수록 평균밀도는 감소하였으며, 영일만에서는 한 개체도 채집되지 않아 동해 연안에는 분포하지 않는 것으로 보인다. 이 어류는 봄에 연안에 출현하기 시작하며 해역에 따라 봄, 혹은 여름에 최대 밀도를 보였다. 봄과 여름에 채집된 개체는 I, II 및 III세의 성어들이었으며, 영광과 삼천포에서는 여름부터 유어들이 채집되기 시작하였다. 가을에는 미성어가 주를 이루었다. 이 결과로 미루어 산란을 위하여 봄에 내만으로 몰려온 성어는 산란을 마친 후 외해로 넓게 분산되며, 많은 유어들은 월동하기 위하여 외해로 이동하는 늦가을까지 내만에서 자라는 것으로 추정된다.

• 한국어류학회지
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• 제30권1호
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• pp.55-64
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• 2018

남해 삼동면 연안의 사질과 잘피밭의 어류군집을 비교하기 위해서 2011년 3월부터 2012년 2월까지 소형 beam trawl과 지인망을 이용하여 어류를 매월 채집하였다. 두 곳의 조사지점에서 공통으로 출현한 종은 총 19종이었다. 실고기, 풀해마, 가시망둑, 돌팍망둑, 감성돔, 베도라치, 문절망둑, 줄망둑, 날개망둑, 살망둑, 두줄망둑, 문치가자미, 복섬 등이 공통으로 출현하였고, 이 중 실고기, 풀해마, 가시망둑, 베도라치, 복섬은 잘피밭에서, 돌팍망둑, 감성돔, 문절망둑, 줄망둑, 날개망둑, 살망둑, 두줄망둑, 문치가자미는 사질연안에서 주로 출현하였다. 실비늘치와 해마, 볼락, 농어, 독가시치는 잘피밭에서만 출현하였고, 풀반지, 숭어, 쑤기미, 양태, 쥐노래미, 알롱횟대, 꼼치, 동갈양태, 댕기망둑은 사질에서만 출현하였다. 채집된 어류 대부분은 소형어나 유어로 남해 연안의 잘피밭과 사질연안이 이들 어류의 성육장의 역할을 하는 것으로 생각된다. 출현 종수는 2011년 8~9월에, 개체수는 2011년 8월이 가장 높았다. 생체량은 2011년 4월과 9월에 가장 높았다. 대체적으로 겨울철에는 출현 종수, 개체수 및 생체량이 모두 낮았다. 개체수 및 생체량은 사질연안에 비하여 모두 잘피밭에서 높았으며, 사질연안에서는 잘피밭을 선호하는 어류들이 다수 출현하였지만, 잘피밭에서는 사질연안을 선호하는 어종이 거의 출현하지 않았다.

• 생명과학회지
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• 제18권6호
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• pp.832-838
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• 2008

수산가공공장폐액의 주성분은 수용성단백질이며 일부 지방이 함유되어 있는 특성이 있으므로 그 수용성 단백질을 등전점 침전처리에 의해 침전회수하여 어분 대체 사료로서의 이용을 시도하였다. 1차 이스라엘잉어 사육 실험에서는 지방 산화가 진행된 고등어가공공장폐액으로 제조 된 고등어가공공장폐액 회수단백질 어분의 첨가량이 증가할수록 사료효율이 떨어지는 결과를 보였으나, 이 산화된 고등어가공폐액 회수단백질의 산화된 지방성분을 제거한 후 다시 2차 이스라엘 잉어 사육 실험을 한 결과에서는 고등어가공폐액 회수단백질의 첨가량이 증가할수록 사료효율이 좋음을 확인하였다. 따라서, 지금까지 버려지는 고등어가공공장폐액 중 수용성단백질을 등전점이동 응집처리법으로 회수하여 어분 대체 단백질원으로 활용할 수 있음을 실제 field에서의 이스라엘 잉어 사육 실험으로 확인할 수 있었다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.358-362
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• 2009

The coastal zone is the transitional area between land and sea. It plays an important role in the land-sea ecosystem. Unfortunately, most of the world's coastal areas are polluted due to the human being activities. Pollution and development are changing coastal habitats, and feeding and nursery areas are being destroyed, reducing fish and wildlife populations. The pollution in coastal areas is becoming a global environmental problem, more and more attention has been paid to coastal areas. America passed the Coastal Zone Management Act (CZMA) in 1972, and from then, CZMA outlined and conducted the National Coastal Zone Management Program and the National Estuarine Research Reserve System which including 34 projects. And England established "the Crouch & Roach Estuary Project" in 2003, and "South East Coastal and Marine Project" was started in 2007 in responding to the non-point pollutants challenge.

• 한국해양공학회지
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• 제25권6호
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• pp.29-34
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• 2011

Various types of coastal structures have been constructed to prevent coastal disasters. Among these coastal structures, submerged breakwaters have been used more widely than all of the other coastal structures because of their excellent advantages in scenery effects, construction efficiency, and environmental benefits. This study investigated the potential of the horizontal plate submerged breakwater model. Usually, it is necessary for a submerged breakwater to minimize and compensate for the negative impacts on the marine environment and ecosystem caused by the marine construction. Thus, the prevention of coastal disasters was verified for this submerged breakwater model, regardless of its function as a fish reef. The purpose of this study was to investigate the hydraulic characteristics with changes in the crest width and porosity of a horizontal plate submerged breakwater and compare the results of this study with the results of other studies on permeable and impermeable submerged breakwaters.

• Ocean and Polar Research
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• 제23권3호
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• pp.305-310
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• 2001

This paper describes a floating fish reef technology for enhancement of fisheries productivity in the muddy areas. The floating fish reef was composed of main fish cage, anchor rope and concrete anchor blocks. Main fish cage was made up of 12 steel buoys measuring 0.37m in diameter and 1.5m long, polyethylene (PE) netting and circular steel rings. Each steel buoy had buoyancy of 110kgf. The size of main fish cage was 1.96 m in diameter and 3.75m in length. Monitoring on its durability was made for eight months after installation. The steel buoys fixed on main fish cage and nettings were observed to be kept safely. The wet weight of fouling organisms per unit area$(m^2)$ was 26.6kgf after eight months. Reduction in the cross-section of steel buoys and circular steel rings of main fish cage were not found. In addition, any cracks on the concrete anchor blocks were not observed.

• 한국양식학회지
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• 제9권1호
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• pp.19-23
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• 1996

Hormonal induction of sex reversal was examined by using sex steroid hormones in serranid fish, Epinephelus septemfasciatus. Young fish were collected from the coastal area of Cheju Island, and reared for 2 years before fish were used for the experiments. Without any hormonal treatment, gonads of fish ($1,000\~2,800$ g in body weight) were occupied by oocytes of the perinucleolus stage and bundles of protogonial cells in the area of germinal epithelium. When the induction of sex reversal was attempted by daily oral administration of $17\alpha$-methyltestosterone (0.5 mg/kg fish) for 90 days, active spermatogenesis was induced, and spermatogonia and spermatocytes and spermatids were appeared in all gonads we examined. However, after daily, oral treatment of $17\beta$-estradiol (0.5 mg/kg fish) to. 50 days with the following injection of human chorionic gonadotrophin ($1,000\~1,500$ IU/kg fish) mature oocytes were not induced in fish gonad.

• 한국해양공학회지
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• 제15권1호
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• pp.36-44
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• 2001

To predict the influence on fish stocks which were caused by environmental change in the fishing ground of shallow sea areas, we have developed the Shallow-Sea Ecological Model(SSEM) which that focuses on living organisms, especially fish and benthos. By applying the SSEM in the Seto-Inland Sea of Japan, we have simulated another aspect of influence on fish stocks that was caused by oxygen deficient water mass and nutrient loads. From the simulated result of the fish stocks, it was indicated that the stock of fish and benthos has shown a relative difference between the western sea and the eastern sea in the Seto-Inland Sea. According the to prediction, results of fish stocks that were caused by oxygen deficient water mass, it was estimated that the pelagicfish stock increases about 6 %, whereas the stocks of demersalfish and benthos decreases about 30% and 70%, respectively. On the other hand, it seemed that there was an increased in the fish stocks of demersalfish and benthos in the eastern sea of Seto-Inland Sea by nutrient loads reduction.

• 환경생물
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• 제31권2호
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• pp.154-157
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• 2013

Length-weight relationships were estimated for 11 fish species caught in Baekya Island, Korea. Samples were caught in depths of <15 m by fish pots between November 2008 and July 2009. The sampling gear, fish pots, is a widely used as commercial fishing gear in shallow waters of the region. The most abundant families were Hexagrammidae (20.7%), Cottidae (18.5%), Tetraodontidae (14.8%) and Scorpaenidae (13.3%). Estimates for parameter b of the length-weight relationship ($W=aL^b$) ranged between 2.454 and 3.361.