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Bacterial and parasitic pathogens in cultured common dentex, Dentex dentex L.

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A bacteriological and parasitological study on cultured common dentex, Dentex dentex L., was conducted in a 2-year survey. Two different groups of fish were studied: (1) sampled only when mortalities occurred; and (2) sampled periodi-cally from 10 days post-hatch until the juvenile stage. In both groups, peaks of mortalities coincided with high water temperatures. The same parasites were detected in both groups, except Ichthyophonus sp., which was identified only in the trunk kidney of fish from group 1. Two myxosporeans, Ceratomyxa sp. and Lepthotheca sp., were found in the bile and the trunk kidney, respectively. Epitheliocystis infection was also very frequent in the gills. An unidentified microsporidium, which was found in the liver, occurred very infrequently. Vibrio harveyi was dominant in samples from diseased animals (79%) and clearly associated with mortalities. It was not detected in water or larval homogenates. A high percentage (60%) of the isolates of this species were sorbitol positive. Other less frequently occurring bacteria were V. alginolyticus and Photobacterium (V.) damselae. The disease conditions found in common dentex were considered to be multifactorial in origin.
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Document Type: Research Article

Publication date: July 1, 1999

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