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Identification and chemotherapeutic effects of the fungi from three salmonid species and their eggs  

Jee, Bo-Young (Pathology Team, National Fisheries Research and Development Institute)
Lee, Deok-Chan (Pathology Team, National Fisheries Research and Development Institute)
Kim, Na-Young (Department of Aquatic Life Medicine, Pukyong National University)
Jung, Sung-Hee (Pathology Team, National Fisheries Research and Development Institute)
Park, Soo-Il (Department of Aquatic Life Medicine, Pukyong National University)
Publication Information
Journal of fish pathology / v.20, no.2, 2007 , pp. 147-160 More about this Journal
Abstract
Four strains of water mold, ChS-E0511, RaT-E0511, RaT-A0512 and MaS-F0512, were isolated from salmonid fish and/or their eggs taken from culture farms in Yangyang, Milyang and Pyeongchang, Korea in 2005. Descriptions of their morphological aspects, the results of the phylogenetic analysis conducted, and the sequence of the small sub-unit 18S rRNAs of the isolates confirmed that they all belong to the species Saprolegnia parasitica. Only one species, ChS-E0511, which was isolated from fertilized eggs of the chum salmon, was classified as part of the S. parasiticaGroup 1 according to its oogonia and gemmae production. The chemotherapeutic effects of various chemicals on the ChS-E0511 strain were assessed from the inhibitory effects of growth in GY media and the relative ratio of eyed eggs to fertilized eggs of the rainbow trout. Malchite green, a prohibited substance in food animals, was better than others, such as the Opuntia ficus-indicaextract, 2-bronopol, and sodium chloride. These results suggest that the fungi isolated from salmonids and/or their eggs identified as S. parasitica were composed of more than two groups. These isolates will be useful in an intensive evaluation of therapeutic agents.
Keywords
Salmonids; Fungal disease; Saprolegnia parasitica; Gemmae; Chemotherapeutic effect;
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