• Title/Summary/Keyword: 양식 어장

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양식 해수 어류에서 분리한 Vibrio harveyi이 특성

  • 이창훈;김수미;원경이;한현자;김도형;박수일
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2000.05a
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    • pp.451-452
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    • 2000
  • 1999년 여름철 우리 나라의 몇몇 해수 어류 양식장과 종묘 배양장에서 Vibrio harveyi가 원인균으로 생각되는 질병이 발생하였다. 어종별 특징적인 증상으로는 넙치의 탈장, 복부팽만, 장충혈, 장액 삼출 및 간출혈과 조피볼락의 체표 궤양 및 간울혈을 들 수 있었으며 같은 시기에 감염증을 나타낸 turbot에서는 체표 출혈과 장출혈이 특징적인 증상이었다. 이 중에서도 특히 넙치의 병징은 에드와드병으로 추정되기 쉬운 특징이 있기 때문인지 각 양어장에서는 간단히 에드와드병으로 진단하고 그에 대한 치료가 실시되고 있었으나 치료 효과가 비교적 낮아서 피해가 증가되고 있는 실정이었다. (중략)

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특집-일본의 재해예방대책 - 3. 리스크 매니저먼트로 보는 어업지역의 감재대책

  • 한국어촌어항협회
    • 어항어장
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    • s.89
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    • pp.41-47
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    • 2010
  • 전국어업지역에 큰 영향을 미칠 가능성이 있는 리스크로서 지진 해일 재해 리스크의 감재대책에 대한 기본적인 사고에 의거, 위기관리의 관점에서 서술하고자 한다. 전국의 어항 어업 취락에서 지진 해일 재해의 리스크를 증대시키는 요인으로서 협소한 토지에 어항시설이나 가옥의 밀집, 고령화의 진행에 의해 재해시 피보호자가 되기 쉬움, 낚시객 해수욕객 등 지리에 어두운 외래자의 방문 증가, 어선이나 어업 양식시설의 표류 우려 등 어업 지역 특유의 여러가지 리스크 인자를 가지고 있다.

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통영연안 해역의 물리화학적 특성

  • 박병수;김정균
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2001.05a
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    • pp.69-70
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    • 2001
  • 통영 인근해역은 해안선의 굴곡이 심하고 많은 섬들이 산재하여 복잡한 해수유동의 양상을 보인다. 해역 내에는 각종 양식어장과 정치망 등이 조밀하게 배치되어있어 해수유동을 저해하고 자가오염으로 인하여 수질은 악화되고 있는 실정이다. 본 연구에서는 미륵도 주변에 5개의 정점을 선정하여 계절별 수질변화를 측정하였다. 그리고 해수유동과 수질과의 관계를 파악하기 위하여 정점별로 유속관측을 병행하였으며 수온, 염분과 유속을 연속 측정하여 상호간의 상관관계를 구명하고자 하였다. (중략)

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작은구슬산호말 (Corallina pilulifera) 물 추출물로부터의 항적조물질 분리

  • ;;Long-Guo JIn
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2001.05a
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    • pp.211-212
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    • 2001
  • 최근 연안어장의 환경오염, 양식생물의 생산력에 막대한 타격과 인간의 건강에 해로운 적조 (red tide)의 빈번한 발생으로 많은 관심이 부각되고 있다. 우리나라 연안에서 발생한 적조현상은 '80년때까지는 대부분 1주일정도 지속되었으나 최근에는 2주일 이상 그리고 '95년도에는 Cochlodinium polykrikoides가 2개월이나 지속된 바 있다. 이러한 현상은 매년 같은 시기에 발생하여 양식장 및 육상 축양장에 심각한 경제적 피해를 주고 있다. (중략)

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Analyse of the Electric Energy Savings Effects of Adjusting Water Turnover on Land-based Fish Farms Raising Olive Flounder Paralichthys olivaceus (환수량 조절을 통한 넙치(Paralichthys olivaceus) 육상 양어장의 전기 에너지 절감 효과 분석)

  • Nam Lee Kim;Noh Back Park;Jin Choi;Byung Hwa Min
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.56 no.5
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    • pp.716-720
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    • 2023
  • This study was designed to analyze the effects of reducing water turnover in olive flounder Paralichthys olivaceus farms, focusing on olive flounder growth, decreasing electricity costs, and developing measures to ensure business stability. Daily water turnover was set at 18 in the control group and six in the experimental group. Juvenile fish were reared for 12 months. No significant differences in mean weight were observed between groups until five months. After five months, the mean weight of the control group grew significantly faster than that of the experimental group. Maintaining water turnovers leverl at six turnovers for the first five months after stocking juvenile fish and then increasing water turnover resulted in a 34.4% reduction in electricity costs compared to the control group. This approach presents a potential method to enhance the profitability of olive flounder farms and ensure stable productivity and profitability without sacrificing olive flounder growth.

Origin and Source Appointment of Sedimentary Organic Matter in Marine Fish Cage Farms Using Carbon and Nitrogen Stable Isotopes (탄소 및 질소 안정동위원소를 활용한 어류 가두리 양식장 내 퇴적 유기물의 기원 및 기여도 평가)

  • Young-Shin Go;Dae-In Lee;Chung Sook Kim;Bo-Ram Sim;Hyung Chul Kim;Won-Chan Lee;Dong-Hun Lee
    • Korean Journal of Ecology and Environment
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    • v.55 no.2
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    • pp.99-110
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    • 2022
  • We investigated physicochemical properties and isotopic compositions of organic matter (δ13CTOC and δ 15NTN) in the old fish farming (OFF) site after the cessation of aquaculture farming. Based on this approach, our objective is to determine the organic matter origin and their relative contributions preserved at sediments of fish farming. Temporal and spatial distribution of particulate and sinking organic matter(OFF sites: 2.0 to 3.3 mg L-1 for particulate matter concentration, 18.8 to 246.6 g m-2 day-1 for sinking organic matter rate, control sites: 2.0 to 3.5 mg L-1 for particulate matter concentration, 25.5 to 129.4 g m-2 day-1 for sinking organic matter rate) between both sites showed significant difference along seasonal precipitations. In contrast to variations of δ13CTOC and δ15NTN values at water columns, these isotopic compositions (OFF sites: -21.5‰ to -20.4‰ for δ13 CTOC, 6.0‰ to 7.6‰ for δ15NTN, control sites: -21.6‰ to -21.0‰ for δ13CTOC, 6.6‰ to 8.0‰ for δ15NTN) investigated at sediments have distinctive isotopic patterns(p<0.05) for seawater-derived nitrogen sources, indicating the increased input of aquaculture-derived sources (e.g., fish fecal). With respect to past fish farming activities, representative sources(e.g., fish fecal and algae) between both sites showed significant difference (p<0.05), confirming predominant contribution (55.9±4.6%) of fish fecal within OFF sites. Thus, our results may determine specific controlling factor for sustainable use of fish farming sites by estimating the discriminative contributions of organic matter between both sites.

Suitable Site Assessment using Habitat Suitability Index for Styela Clava and Styela Plicata in Jindong Bay (서식지 적합지수를 이용한 진동만 미더덕과 주름미더덕의 어장적지평가)

  • Cho, Yoon-Sik;Hong, Sok-Jin;Lee, Won-Chan;Kim, Hyung-Chul;Kim, Jeong-Bae
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.19 no.6
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    • pp.597-605
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    • 2013
  • This study was conducted in warty sea squirt farm, Jindong Bay(10 stations; July, October, January, April) for the culture period of Styela clava, Styela plicata. We utilized water temperature, chlorophyll a, suspended particulate matter, hydrodynamics, salinity and dissolved oxygen saturation for the suitability assessment of warty sea squirt farm. Newly, Life Requisite Suitability graphs were made for the correlation between the growth of Styela clava, Styela plicata and farm environment. As a result of the assessment for Habitat Suitability Index, western bay(HSI 0.32~0.41) show values higher than eastern bay(HSI 0.19~0.27). This result shows the high correlation with the unit production of Styela clava, Styela plicata($R^2$=0.834, P<0.01). This could be helpful for fishery management for the sustainable productivity through the scientific suitable site assessment.

Suitable Site Assessment using Habitat Suitability Index for Ruditapes philippinarum in Gochang(Hajun) (서식지 적합지수를 이용한 고창 갯벌어장 바지락의 어장적지평가)

  • Jeon, Seungryul;Choi, Yoon-Seok;Cho, Yoon-Sik;Kim, Yeong-Tae;Choi, Yonghyeon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.21 no.5
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    • pp.484-491
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    • 2015
  • The productivity of Manila clam(Ruditapes philippinarum) aquaculture farm is closely related to suitable site selection, so it is essential to assess the habitat suitable for aquaculture species in order to manage yield. This study evaluated the habitat suitable index(HSI) with 9 sites for tidal flat farm, Gochang(Hajun) on May 2014. The suitability index was selected Growth(hydrodynamics, chlorophyll a), Survival(sediment-sand, silt-clay) and Water Environment(dissolved oxygen, salinity). Both Weight and No weight were tried for objective judgment as HSI scoring method. As a result, it shows lower tidal flat(HSI; No weight: 0.60~0.76, Weight: 0.47~0.70) is higher than upper(HSI; No weight: 0.25~0.27, Weight: 0.09~0.10), hydrodynamics and sediment particle size are the most effective. This research can consider the potential suitable site for Manila clam through scientific approach, and provide the basis for optimal management practices in tidal flat farm.

Recycling Water Treatment of Aquaculture by Using DynaSand Filter II. Effect of Coating on Removal of Bacteria and Virus in Sand Columns (상향류식 연속 역세 여과를 이용한 양어장 순환수 재리용 II. 여과사의 표면처리에 의한 세균 및 바이러스 처리율 검토)

  • 박종호;조규석;황규덕;김이오
    • Journal of Aquaculture
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    • v.16 no.2
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    • pp.76-83
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    • 2003
  • To improve the efficiency of removal of bacteria and virus with DynaSand Filters used for treatment of recycling wastewater from aquaculture, effect of biofilm formation on bacterial transport through coated sand was estimated. At the neutral pH (pH 7.0), the coated sand was positive of zeta potential (surface charge). Column experiments were also carried out to test the effect of uncoated sand as well as coated sand with Al and Fe. The coated sand influenced more significantly the surface properties, adsorption and transport than the uncoated sand. The leaching batch system investigated for synthetic water showed concentrations of 7.47, 4.80, 20.89 and 7.23 mg/L for the uncoated sand, coated sand with Al, Fe and Al+Fe, respectively. Hence there are significant differences among the tested coatings with reference to bacterial transport and surface properties.

Treatment of Recycling Wastewater of Aquaculture Using DynaSand Filter( I ) (상향류식 연속역세여과를 이용한 양어장 순환수 재이용(I))

  • 박종호;김이오;황규덕;황금희;조규석;김동식
    • Journal of Aquaculture
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    • v.15 no.2
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    • pp.87-93
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    • 2002
  • To improve the efficiency of biological filters used for treating recycled wastewater of aquaculture, the conventional and advanced DynaSand Filters were tested. Applying the fluid mechanics and physical chemistry theories to wastewater treatment plant, the advanced filter focuses on detection of wastewater characteristics and automatic operation of DynaSand Filter to improve backwashing, oxygen transport, turbidity removal and continuous head loss. The Filter removes COD, ammonia, and suspended solids (SS), the major pollutants in aquaculture wastewater. The total volume of the DynaSand Filter is 70 L, while the working volume is 35 L per cycle. The removal efficiency of the advanced DynaSand Filter is 71 % for SS (as against 55 % for the conventional filter), 84 % for ammonia, 85 % for T-P, and 88 % for SRP.