Ochroconis humicula infection in fingerling striped Jack, Pseudocaranx dentex in Japan
2006
Chutharat Munchan(Nippon Veterinary an Animal Science University, Tokyo (Japan). Division of Fish Disease) | Kurata, Osamu(Nippon Veterinary an Animal Science University, Tokyo (Japan). Division of Fish Disease) | Hatai, Kishio(Nippon Veterinary an Animal Science University, Tokyo (Japan). Division of Fish Disease) | Nakaoka, Noriyoshi(Ehime Prefectural Fish Disease Control Center, Uwajima (Japan)) | Kawakami, Hidemasa(Ehime Prefectural Fish Disease Control Center, Uwajima (Japan))
Fungal infection occurred in cultured striped jack, Pseudocaranx dentex, at a farm in Ehime Prefecture in April 2004, Japan. Accumulative mortality reached to 25 percent for one month after the infection was noticed. Fish were aproximately 6 cm in body length. Diseased fish showed typical signs such as swelling of abdomen and whitish nodules in spleen and kidney. Swelling of kidney was also found in the diseased fish. Numerous brownish hyphae were observed in the tissues under a microscope. A fungus was purely isolated from kidney and spleen using PYGS agar. It was identified as Ochroconis humicola from morphological characteristics. Additionally some biological characteristic of the fungus was also studied. Pathogenicity of the isolate to fingerling striped jack was conducted. Experimental fish were divided into 3 groups. Each 30 fish was intraperitoneally injected with 0.1 ml of 5*10**(6), 5*10**(4) and 0 conidia/ml. The cumulative mortality in each group was 80.0, 3.3 and 0 percent, respectively. Histological examination of the liver, kidney and spleen of the test groups showed fungal hyphae and granulomas.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
