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http://dx.doi.org/10.11626/KJEB.2013.31.4.486

Pathological Changes in Cultured Korean Catfish (Silurus asotus) Artficially Infected with Aeromonas veronii  

Kim, Jin-Do (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Do, Jeong-Wan (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Choi, Hye-Sung (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Seo, Jung-Soo (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Jung, Sung-Hee (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Jo, Hyae-In (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Park, Myung-Ae (Aquatic Life Disease Control Division, NFRDI)
Lee, Nam-Sil (New Strategy Research Center, NFRDI)
Park, Sung-Woo (Department of Aquatic Life Medicine, Kunsan National University)
Publication Information
Korean Journal of Environmental Biology / v.31, no.4, 2013 , pp. 486-492 More about this Journal
Abstract
Recently, a new disease showing symptoms such as epidermal exfoliation and muscular necrosis occurred in cultured Korean catfish. Although the mortality of fishes was low but the economic damages owing to loss of commercial value were severe. The authors isolated the causative agent from diseased fish and observed pathological changes both in naturally and artificially infected fish. The causative bacteria was identified as Aeromonas veronii. Subsequently we observed the daily death and pathological symptoms of artificially infected fish with Aeromonas veronii. Symptoms of artificially infected fish were similar to those of naturally infected fish and all fish died within 7 days after infection. Histopathological changes on the naturally infected fish revealed severe congestion and necrotic degeneration in the liver, spleen and kidney. Some bacterial aggregates with inflammatory degeneration were observed in the heart, and congestion and fibrosis in the lamina propria of digestive tube were predominant. In artificially infected fish, skin erosion and necrotic degeneration of muscle tissue around injected region were particularly manifested. Degeneration of hepatocytes in liver and hyalic degeneration around ellipsoids in spleen were partially observed. However, there were no predominant signs in digestive tube in artificially infected fish.
Keywords
Aeromonas veronii; experimental infection; cafish; pathological change;
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