• 제목/요약/키워드: farmed-fish

검색결과 113건 처리시간 0.023초

넙치(Paralichthys olivaceus) 근육 채취 방법에 따른 Kudoa septempunctata 진단 효율 비교 (Evaluation of a Non-destructive Diagnostic Test for Kudoa septempunctata in Farmed Olive Flounder Paralichthys olivaceus)

  • 송준영;정승희;최혜승
    • 한국수산과학회지
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    • 제51권1호
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    • pp.23-30
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    • 2018
  • Kudoa septempunctata, a myxosporean parasite that infects olive flounder Paralichthys olivaceus is known to cause Kudoa food poisoning. Entire trunk muscle (ETM) is used for diagnosis of the parasite in fish and this method demands sacrifice of the host, causing a loss of commercial value. We developed a non-destructive method that uses a plastic syringe-style implanter to draw the sample, called the part-point muscle (PPM) sampling technique. We validated the PPM method in fish infected with K. septempunctata at the level detectable by the ETM method. We confirmed that the PPM method is equally sensitive in comparison to the ETM method for diagnosing K. septempunctata spores in olive flounder muscle. Our study also confirmed that the parasite is uniformly distributed in the dorsal muscle of infected fish. Over a period of 1 month, we observed no mortality of the host fish used for sampling by the PPM method. Thus, our studies demonstrate that the PPM sampling technique is an efficient, non-destructive method for diagnosing K. septempunctata in olive flounder.

Nitrogen allocation of Gracilaria tikvahiae grown in urbanized estuaries of Long Island Sound and New York City, USA: a preliminary evaluation of ocean farmed Gracilaria for alternative fish feeds

  • Johnson, Ronald B.;Kim, Jang K.;Armbruster, Lisa C.;Yarish, Charles
    • ALGAE
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    • 제29권3호
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    • pp.227-235
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    • 2014
  • The red seaweed, Gracilaria tikvahiae McLachlan, was cultivated in open water farms in urbanized estuaries of Long Island Sound (26-30 psu of salinity) and New York City (20-25 psu), USA in 2011. Plants were harvested monthly from summer (August, $24^{\circ}C$) to fall (November, $13^{\circ}C$) and analyzed for total nitrogen, protein, and amino acid content. On a dry matter (DM) basis, nitrogen and protein significantly increased over the harvest period until October and then plateaued. Nitrogen increased from $22{\pm}1g\;kg^{-1}$ DM in August to $39{\pm}3g\;kg^{-1}$ DM in October (p < 0.001). Protein increased from $107{\pm}13g\;kg^{-1}$ DM in August to $196{\pm}5g\;kg^{-1}$ DM in November (p < 0.001). With two exceptions, amino acid concentrations expressed on a crude protein (CP) basis were similar over the harvest period. Essential amino acids accounted for $48{\pm}1%$ of all amino acids present with lysine and methionine averaging $56{\pm}2g\;kg^{-1}$ CP and $18{\pm}1g\;kg^{-1}$ CP, respectively. Histidine was underrepresented among essential amino acids and averaged $13{\pm}1g\;kg^{-1}$ CP. Taurine ranged from 2.1 to $3.2g\;kg^{-1}$ DM. With its moderate levels of lysine, methionine and taurine, ocean farmed G. tikvahiae has the potential of overcoming many nutrient deficiencies currently associated with terrestrial plant ingredients in alternative feeds for fish and shrimp.

Changes in hematoserological profiles and leukocyte redistribution in rainbow trout (Oncorhynchus mykiss) under progressive hypoxia

  • Roh, HyeongJin;Kim, Bo Seong;Kim, Ahran;Kim, Nameun;Lee, Mu Kun;Park, Chan-Il;Kim, Do-Hyung
    • 한국어병학회지
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    • 제33권1호
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    • pp.23-34
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    • 2020
  • In recent years, global warming is causing dramatic environmental changes and deterioration, such as hypoxia, leading to reduced survival rate and growth performance of farmed aquatic animals. Hence, understanding systemic immuno-physiological changes in fish under environmental stress might be important to maximize aquaculture production. In this study, we investigated physiological changes in rainbow trout exposed to hypoxic stress by monitoring changes in blood chemistry, leukocyte population, and expression levels of related cytokine genes. Hematological and serological factors were evaluated in blood obtained from rainbow trout sampled at a dissolved level of 4.6 mg O2 L-1 and 2.1 mg O2 L-1. Blood and head kidney tissue obtained at each sampling time point were used to determine erythrocyte size, leukocyte population, and cytokine gene expression. The level of LDH and GPT in fish under progressive hypoxia were significantly increased in plasma. Likewise, the (Granulocyte + Macrophage)/lymphocyte ratio (%) of fish exposed to hypoxia was significantly lower than that in fish in the control group. Such changes might be due to the rapid movement of lymphocytes in fish exposed to acute hypoxia. In this study, significant up-regulation in expression levels of IL-1β and IL-6 gene appeared to be involved in the redistribution of leukocytes in rainbow trout. This is the first study to demonstrate the involvement of cytokines in leukocyte trafficking in fish exposed to hypoxia. It will help us understand systemic physiological changes and mechanisms involved in teleost under hypoxic stress.

Isolation and Characterization of Flavobacterium johnsoniae from Farmed Rainbow Trout Oncorhynchus mykiss

  • Suebsing, Rungkarn;Kim, Jeong-Ho
    • Fisheries and Aquatic Sciences
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    • 제15권1호
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    • pp.83-89
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    • 2012
  • Flavobacterium johnsoniae was isolated from farmed rainbow trout Oncorhynchus mykiss in Korea, and its biochemical and molecular characterization was determined. Yellow-pigmented bacterial colonies were isolated from 18 of 64 fish samples (28.1%) on trypticase soy agar plates, and their biochemical profiles were characterized by API 20E and API 20NE test kits. F. johnsoniae was identified by biochemical phenotyping of factors including rapid gliding motility, Gram-negative condition, oxidase- and catalase-positive status, Congo red absorption, nitrate reduction, ${\beta}$-galactosidase production, acid production from glucose, and gelatin and casein hydrolysis. PCR and subsequent sequencing of 16S rRNA confirmed that the yellow-pigmented colonies were most similar to F. johnsoniae. The alignment analysis of 16S rRNA sequences also showed that all 18 rainbow trout isolates had highly similar homologies (97-99% identity). One isolate was selected and named FjRt09. This isolate showed 98% homology with previously reported F. johnsoniae isolates, and in phylogenetic analysis was more closely grouped with F. johnsoniae than with F. psychrophilum, F. columnare, or F. branchiophilum. This is the first report on the occurrence and biochemical characterization of F. johnsoniae isolated from rainbow trout in Korea.

어류 양식장에서 분리한 Vibrio parahaemolyticus의 trimethoprim 내성 (Trimethoprim Resistance of Vibrio parahaemolyticus Isolated from the Fish Farm)

  • 오은경;유홍식;신순범;손광태;박큰바위;권지영;이태식;이희정
    • 한국수산과학회지
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    • 제41권5호
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    • pp.324-329
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    • 2008
  • Vibrio parahaemolyticus species, which cause acute gastroenteritis in humans, were isolated from farmed fish and seawater and their antimicrobial-resistance pattern and factor were investigated. They exhibited the highest resistance to ampicillin (88.9%), followed by trimethoprim (51.9%) and rifampin (22.2%). The relatively high resistance to trimethoprim was unexpected because trimethoprim was not commonly used in fish farming in Korea. R plasmid related resistance was identified by the treatment of novobiocin (7 ug/mL) and it was named as pVPBW1. A putative trimethoprim resistance gene in 2.0 kb fragment of pVPBW1 was also confirmed.

양식 은어의 미포자충 감염예에 대한 병리조직학적 관찰 (Histopathology of a microspridian infection in ayu, Plecoglossus altivelis, from southern Korea)

  • 조병열;강형길;강효주;류갑민;이재영;박남규;허민도
    • 한국어병학회지
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    • 제16권1호
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    • pp.23-30
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    • 2003
  • On September in 1998, a microsporidian infection was recognized in ayu, Plecoglossus altivelis, farmed on Kyongnam province of South Korea. Cumulative mortality was around 10% in 10 days. Infected fish which were piping for air near the surface of the water or in the asphyxic, lethargic condition revealed darkening of body and abdominal distention. Numerous whitish nodules up to 3mm in size were observed throughout most of body organs and tissues including gill, operculum, peritoneal wall and organs. Xenomas were also histologically confirmed in multiple internal organs with the evidences suggesting circulatory disturbance. Based on the morphology of spore and xenoma, and the distribution of xenomas in organs and tissues, this disease was diagnosed to be a microsporidiosis caused by Glugea plecoglossi. The mortality might be deeply related to the local circulatory disturbance by xemonas rather than the mechano-chemical effect of xenomas on adjacent tissues.

First report of Aeromonas veronii infection in farmed Israeli carp Cyprinus carpio in Korea

  • Yu, Jin-Ha;Han, Jung-Jo;Kim, Hyoung-Jun;Kang, Sun-Gu;Park, Sung-Woo
    • 한국어병학회지
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    • 제23권2호
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    • pp.165-176
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    • 2010
  • In May 2007, mass mortality of Israeli carp, Cyprinus carpio L., was occured on a pond farm located in Jeollabukdo Province, Korea. The mortality rates reached up to 2% of the total fish in the farm per day. Typical clinical signs were abdominal distension, reddish foci on the skin, enteritis, liver congestion and enlarged spleen and kidney. On the basis of biochemical characteristics and 16S rDNA sequence, the causative bacteria isolated from affected carp were identified as Aeromonas veronii. Histologically, degeneration of hepatocytes and congestion in sinusoids were observed in the liver. Spleen showed hemorrhage and the destruction of the sheathed tissues. In kidney, necrotized renal tubules and glomerular destructions were observed. Intestinal tissues revealed necrotized and severe hemorrhage. Mass hemorrhage was observed in muscles. This is the first report that A. veronii caused mortality in cultured Israeli carp in Korea.

Antimicrobial Efficacy of the Disinfectant Solution Nanoxil® Against Fish Pathogenic Bacteria

  • Cha, Chun-Nam;Jung, Won-Chul;Lee, Yeo-Eun;Yoo, Chang-Yeul;Kim, Suk;Lee, Hu-Jang
    • 한국환경보건학회지
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    • 제36권6호
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    • pp.496-501
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    • 2010
  • Fish pathogenic bacteria are a considerable danger of farmed fish and a source of economic loss in the fish farming industry. In this study, $Nanoxil^{(R)}$ was compared to hydrogen peroxide and a silver colloid in terms of disinfection efficacy against E. tarda, V. anguillarum and S. iniae. A bactericidal efficacy test conducted by a broth dilution method was used to determine the lowest effective dilution of the disinfectant following exposure to test bacteria for 30 min at $4^{\circ}C$. $Nanoxil^{(R)}$ and test bacteria were diluted with distilled water (DW), hard water (HW) or an organic matter suspension (OM) according to the treatment condition. Under the OM condition, the bactericidal activity of $Nanoxil^{(R)}$ against E. tarda exhibited a lowered efficacy compared to that under the DW and HW conditions. $Nanoxil^{(R)}$ at 500 fold (dilutions on) under all of the conditions demonstrated a high bactericidal efficacy against S. iniae. As $Nanoxil^{(R)}$ possess bactericidal efficacy against fish pathogenic bacteria such as E. tarda, V. anguillarum and S. iniae, this disinfectant solution can be used to limit the spread of fish bacterial diseases.

순환여과시스템에서 양식되는 바리과 어류 3종[능성어, (Hyporthodus septemfasciatus), 자바리(Epinephelus moara), 교잡종 대왕자바리(E. moara ♀× E. lanceolatus ♂)]의 감염성 질병 모니터링 (Monitoring of infectious diseases in three grouper species (Hyporthodus septemfasciatus, Epinephelus moara and E. moara ♀× E. lanceolatus ♂) cultured in recirculating aquaculture systems)

  • 최희재;최다연;조성현;신제윤;박종연;방인철;강예재
    • 한국어병학회지
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    • 제37권1호
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    • pp.97-110
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    • 2024
  • The Serranidae is high-quality fish species with good meat quality and is traded at high price, and is attracting attention in South Korea as a cultured species that creates high added value. However, the high-density fish farming for mass production increases the risk of mass mortality due to infectious diseases, leading to enormous economic losses. Therefore, in order to safely prevent and protect farmed fish from serious infectious diseases, it is necessary to conduct disease monitoring on a regular basis. In this study, Hyporthodus septemfasciatus, Epinephelus moara, and the hybrid longtooth grouper (E. moara ♀×E. lanceolatus ♂) were collected once a month from fish farm of Garorim and Aquabiotech Co., Ltd for a total of six months, from July to December 2023. We investigated infections of five species of bacterial diseases, including Flavobacterium columnare, six species of viral diseases, including LCDV (lymphocystis disease virus), and parasitic pathogens in grouper farms. As the result, Vibrio vulnificus and V. harveyi were detected in H. septemfasciatus in August, in the case of viral diseases, NNV was detected in H. septemfasciatus from July to August using RT-PCR or PCR. Finally, In the case of parasitic diseases, Tricodina sp. was detected in E. moara and the hybrid longtooth grouper from August to December.

Norcardia 감염증에 의한 양식 가물치의 대량 폐사 (Mass Mortality Caused by Nocardial Infection in Cultured Snakehead, Channa arga in Korea)

  • 박명애;이덕찬;조미영;최희정;김진우
    • 한국어병학회지
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    • 제18권2호
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    • pp.157-165
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    • 2005
  • 2005년 여름에 국내에서 사육되는 가물치에서 대량폐사를 수반하는 새로운 질병이 발견되었다. 감염 어류는 복부팽만과 항문 주위 출혈 이외의 특이한 외부 증상을 나타내지 않았으나 복부를 절개하면 많은 수의 백색 결절이 간, 비장 및 신장을 포함한 내부 장기에서 관찰되었다. 특히 내부 장기의 조직병리학적 관찰에서 granuloma가 관찰되었다. 이들 감염 어류에서 Gram 양성의 사상균이 분리되었다. 분리균은 Nocardia spp.와 non-Nocardia 균의 16S rRNA 염기 분석에 기초한 Nocardia 특이 primer를 사용한 PCR 방법으로 확인하였다. 이것은 어류에서 발생한 Nocardia 감염증의 국내 첫 사례이다.