腐植土抽出物を経口投与したコイ(Cyprinus carpio L.)における非定型Aeromonas salmonicida感染防御

  • KODAMA Hiroshi
    Laboratory of Veterinary Immunology, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • DENSO
    Laboratory of Veterinary Immunology, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • NAKAGAWA Tsuyoshi
    Laboratory of Veterinary Immunology, Course of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University

書誌事項

タイトル別名
  • Protection against Atypical Aeromonas salmonicida Infection in Carp (Cyprinus carpio L.) by Oral Administration of Humus Extract
  • Immunology: Protection against atypical Aeromonas salmonicida infection in carp (Cyprinus caprio L.) by oral administration of humus extract

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抄録

Humic substances are formed during the decomposition of organic matter in humus, and are found in many natural environments in which organic materials and microorganisms have been present. In the present study, oral administration of humus extract to common carp (Cyprinus carpio L.) induced effective protection against experimental atypical Aeromonas salmonicida infection. Mortality of fish and development of skin lesions such as hemorrhages and ulcers were significantly suppressed in carp treated with 10%, 5% or 1% humus extract adsorbed on dry feeding pellets. The median surviving days was also greater in fish treated with 10% or 5% humus extract than in untreated fish. Atypical A. salmonicida was isolated from ulcerative lesions of part of dead fish, but Aeromonas hydrophila and Flavobacterium sp. were also isolated from these fish, verifying bacterial population changes during the progression of skin lesions. These results clearly show that treatment of fish with humus extract is effective in preventing A. salmonicida disease.<br>

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