• Title/Summary/Keyword: Fish farm in Jeju-island

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Oceanographic Environment Characteristics in Waters Adjacent to Fish Farm on Land (육상 양식장 인접해역의 해양학적 환경특성)

  • 조규대;이충일;김동선;양윤정
    • Journal of Environmental Science International
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    • v.11 no.4
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    • pp.297-308
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    • 2002
  • Field observations for research of oceanographic characteristics in waters adjacent to fish farm on land and water quality at area where water is supplied to fish farm and area where water is discharged from fish farm are carried out in coastal waters of Pyoson located in the southeastern region of Jeju Island in March, May, August and November of 2000. Semidiurnal tides to the northeast and southwest dominate. The mean velocities of current around neap tides and spring tides are 8.52cmㆍs$^{-1}$, 28.63cmㆍs$^{-1}$, respectively. The difference of temperature between area where water is supplied to fish farm and area where water is discharged from fish farm is about 0.6$^{\circ}C$. Seasonal variation range for temperature and salinity is 13.5$^{\circ}C$ and 3.5psu, individually. Concentrations of nitrate(NO$_3$$^{-}$), phosphate(PO$_4$$^{3-}$ ), silicate(SiO$_2$) and COD(chemical oxygen demand) are high in autumn. Particularly, concentrations of nitrate and COD in winter and spring at station where water is supplied to fish farm are higher than these at station where water is dischared from fish farm. However, concentration of phosphate and silicate at station where is supplied to fish farm in spring, summer and autumn is higher than that at station where water is dischared from fish farm. Water quality in the study area is grade 1 and this level is kept up in the whole year.

Distribution of Indicator Bacteria in Seawater off the Coast of Jeju Island (제주도 연안 해역의 오염지표세균의 분포)

  • Roh, Heyong Jin;Lim, Yun-Jin;Kim, Ahran;Kim, Nam Eun;Kim, Youngjae;Park, Noh Back;Hwang, Jee-Youn;Kwon, Mun-Gyeong;Kim, Do-Hyung
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.51 no.4
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    • pp.450-455
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    • 2018
  • We examined correlations of the density of fish farms with the distributions of indicator bacteria (Escherichia coli, fecal streptococci) and a bacterial fish pathogen (Streptococcus parauberis) off the coastline of Jeju Island. Seawater samples were collected at four coastal sites on the Island [Aewol (control), Gujwa, Pyoseon and Daejeong] in June, August and October 2016. The indicator bacteria were generally more frequently isolated from samples taken in August when water temperatures and human activities on nearby beaches were highest. Although fish farms were least common at Daejeong, the numbers of isolated fecal indicator bacteria were highest in the seawater and effluent water collected from this site. Hence, fish farms were not likely major contributors of indicator bacteria at Daejeong. We found discrepancies between the isolated bacterial counts and the predicted bacterial copy numbers deduced from our qPCR results, indicating that this pathogen may exist in a viable but non-culturable (VBNC) state in seawater. Thus, livestock wastewater and chemical fertilizer loading off Jeju Island may negatively impact seawater quality more than the effluent released from fish farms does.

Antimicrobial effect of chitosan oligosaccharides, prepared under ultrafiltration membrane bioreactor, against pathogenic bacteria causing flounder fish diseases in aquacultural farm

  • Heo, Moon-Soo;Jeon, You-Jin;Lee, Ki-Wan;Song, Choon-Bok;Lee, Jehee;Yeo, In-Kyo;Yang, Byung-Gyoo;Kim, Se-Kwon
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2001.10a
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    • pp.145-146
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    • 2001
  • Despite a variety of development in fish farming during the last decades, fish diseases by bacteria, virus, and parasites are still major problems in aquaculture. Aquaculture of Hounder fish is widely performed around Korea as well as Jeju island, due to relatively stable seed production, short farming period, and a higher value in market. However, intensive feeding and environmental pollution in aquacutural farm act as a great limiting factor in economic aspect. (omitted)

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Distribution of Indicator Bacteria in Seawater off the Coasts of Jeju Island and Pohang in 2017 (2017년 동해안권역과 제주도권역 양식장 주변 해역의 오염지표세균의 분포)

  • Roh, Heyong Jin;Kim, Nam Eun;Chun, Won-Kyong;Kim, Ahran;Lee, Yoonhnag;Kim, Youngjae;Hwang, Jee-Youn;Kim, Do-Hyung
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.51 no.6
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    • pp.697-703
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    • 2018
  • In 2017, total coliform (TC), fecal coliform (FC) and fecal Streptococci (FS) bacteria were examined in seawater samples collected at coastal sites on Jeju Island (Aewol as a control, Namwon, and Daejeong) and at Pohang (Yeongil as a control, Guryongpo-North, and Guryongpo-South) to examine the correlations between the density of fish farms and distributions of the indicator bacteria. Only a few TC, FC, and FS colonies were detected in all of the samples obtained from Jeju Island. Of note, 2,000 and 1,000 CFU of FS $100mL^{-1}$ were detected in samples from Guryongpo-South in June and August, respectively. Although the total area of approved fish farms located within 5 km of the sampling point at Guryongpo-South is 5-16 times smaller than in other regions, the number of indicator bacteria was highest in this region. Therefore, microbiological pollution in the Guryongpo-South region might be due to sources other than the effluent released from nearby fish farms.

Survey of the level of Microbial Contamination in Fish Farms on the Jeju-Island (제주도 어류양식장에 대한 미생물학적 오염도 조사)

  • Moon, Young-Gun;Ha, Jin-Hwan;Kang, Chang-Hee;Song, Chung-Bok;Oh, Myung-Cheol;Heo, Moon-Soo
    • Journal of Food Hygiene and Safety
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    • v.22 no.3
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    • pp.179-191
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    • 2007
  • The purpose of this study was to monitor and compare the contamination levels of heterotrophic bacteria and pathogenic bacteria (total coliforms, Escherichia coli O157:H7, Salmonella spp., Vibrio parachaemolyticus, Staphylococcus aureus and Bacillus cereus). The samples collected at fish farms located in the Jeju-island were investigated from March to August in 2006. The contamination levels of S. aureus, B. cereus and Salmonella spp. ranged $0-3.3{\times}10^2 CFU/ml,\;0-2.2{\times}10^2 CFU/ml\;and\;0-5.1{\times}10^1CFU/ml$, respectively, and 85% of moist pellet feeds were contaminated with S. aureus, B. cereus and total coliforms. But total coliforms and E. coli O157:H7 were not detected in oliver flounder (Paralichthys olivaceus). For the production of safe oliver flounder (Paralichthys olivaceus), education of sanitation for employees, control of fish feed, and continuous monitoring for microorganism will be required.

Scuticociliatosis in flounder farms of Jeju island (제주도지역 넙치양식장의 스쿠티카증 발생동향)

  • Jin, Chang-Nam;Kang, Hyun-Sil;Moon, Young-Gun;Lee, Chang-Hoon;Lee, Young-Don;Lee, Je-Hee;Song, Choon-Bok;Heo, Moon-Soo
    • Journal of fish pathology
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    • v.20 no.1
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    • pp.93-98
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    • 2007
  • The prevalence of the scuticociliatosis in flounder farms of Jeju island was surveyed for ten years from 1995 to 2004. The occurrence ratio had maintained as less than 10% until mid 1990s, and shown increasing trends to year 1998. The ratio was equivalent to over 40% of overall disease occurrences in flounder farms since year 2000. The monthly infection rates by the scuticociliates indicated relatively higher levels from May to September, and mixed infection phenomena with bacterial disease of vibriosis were common.

A Study on Development of Protein Materials using Dead Flatfish from Fish Farms(2) -Industrial Process- (양식장 넙치 폐사어를 이용한 단백질 소재의 개발에 관한 연구(2) -산업화공정 연구-)

  • Kang, Keon-Hee;Lee, Min-Gyu;Kam, Sang-Kyu;Jeong, Kap-Seop
    • Journal of Environmental Science International
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    • v.22 no.12
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    • pp.1625-1631
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    • 2013
  • In manufacturing of flatfish skin collagen peptide (FSCP) and flatfish protein hydrolysate (FPH) by reuse of dead flatfish from fish farm in Jeju island, the industrial process was optimized with the laboratory scale research and the on-field process. Segmented unit processes from raw material incoming to shipment were established to produce commercial product of FSCP and FPH. Total plate counts of FSCP were twenty five times of FPH, but food poisoning bacteria were not detected in two samples. FSCP and FPH were safe from heavy metal such as Pb(II), Cd(II) and Hg(II). The residual contents of antibiotics and disinfection matter in FSCP and FPH were not detected. The optimized process for mass production made the one-third of the running time and two times of the yield. From economic analysis, the production cost was estimated to 22,000 and 12,000 won/kg for FSCP and FPH, respectively. Therefore the product from the reuse of dead flatfish was expected to have a considerable competitive price and high added-value functional food material compared with other commercially available fish products.

Characteristics of $\beta$-Streptococcus spp. Isolated in Cultured Flounder (Paralichthys olivaceus) of Jeju Island (제주산 양식넙치 (Paralichthys olivaceus)로부터 분리된 $\beta$-용혈성 연쇄구균 ($\beta$-Streptococcsus spp.)의 특성)

  • HEO Moon-Soo;SONG Choon Bok;LEE Jehee;YEO In-Kyu;JEON You-Jin;LEE Jung-Jae;CHUNG Sang-Chul;LEE Ki-Wan;RHO Sum;CHOI Kwang-Sik;LEE Young Don
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.4
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    • pp.365-369
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    • 2001
  • Streptococcus spp. of bacterial pathogen of fish were isolated from the cultured flounder (Paralichthys olivaceus) in fish farm of Jeju Island. Clinical signs of the infected flounder which are the most commons symptoms are as follows: erratic swimming, darkening of the body colour, unilateral or bilateral exophthalmia, corneal opacity, hemorrhages in the opercular and the bases of the fins, and the ulceration of the body surface. Biochemical characteristics of pathogenic fish Streptococcus spp, were gram positive, spherical form, catalase negative, oxidase negative and $\beta$-haemolytic, respectively, The viable cells counted from the tissue of the diseased flounder were the largest in the order of the ulcer, the kidney, the blood and the brain, The drugs used were ampicillin, ciprofloxacin, doxycycline, gentamycin, tetracycline, erythromycin, streptomycin and oxytetracycline, Streptococcus spp. were found to be sensitive to ampicillin, ciprofloxacin, doxycycline and gentamycin, but were resistant to tetracycline, erythromycin, streptomycin and oxytetracycline. The pathogenicity of Streptococcus spp. on the cultured flounder with an abdominal cavity injection was high. The haemolytic activity of the toxin against the sheep red blood cells reached the maximum after 30 min incubation at $37^{\circ}C$ or $50^{\circ}C$. The toxin showed highest activity at pH $5.5\sim6.5$.

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