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Nocardiosis in sea bass, Lateolabrax japonicus , in Taiwan
Author(s) -
Chen SC,
Lee JL,
Lai CC,
Gu YW,
Wang CT,
Chang HY,
Tsai KH
Publication year - 2000
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1046/j.1365-2761.2000.00217.x
Subject(s) - lateolabrax , biology , nocardiosis , bass (fish) , staining , sea bass , lesion , epizootic , bacteria , nocardia , anatomy , pathology , fishery , fish <actinopterygii> , immunology , medicine , virus , genetics
An epizootic in pond cultured sea bass, Lateolabrax japonicus , was caused by Nocardia sp. in Taiwan, in September and October 1997. The cumulative mortality within 1 month was 17.5% (3500 out of 20 000 fish) and diseased fish were 7 months old with total lengths from 25 to 30 cm. Multiple, yellowish white nodules, 0.1–0.2 cm in diameter, were scattered in the gill, heart, liver, spleen and kidney. Histopathologically, typical granulomatous lesions appeared in those organs. The morphology of isolated bacteria from brain heart infusion (BHI) medium or Lowenstein–Jensen medium (LJM) were bead‐like filaments, as shown by Ziehl‐Neelsen's (ZN) staining method. The gross lesion and histopathological changes found in experimentally infected fish were similar to those in naturally infected fish. Based on the growth characteristics, morphological and biochemical properties of the bacterium, and histopathological changes, the isolated bacteria were identified as Nocardia seriolae . This is the first report of N. seriolae ‐infected sea bass in aquaculture.