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Potential threat to reservoir fishery by fungi in Kumaun Himalaya, India

Potential threat to reservoir fishery by fungi in Kumaun Himalaya, India

Current Science (Bangalore) 71(9): 720-723

Zoosporic fungi are among the most destructive fish pathogens. Eighteen species belonging to Achlya, Aphanomyces, Dictyuchus, Saprolegnia and Pythium were isolated from Nanak Sagar, which has witnessed mass mortality of fish fauna during 1991-94. Of these, 8 species were also detected from diseased and moribund fish. Species of the parasites and the hosts demonstrated differential pathogenicity and immunity respectively. Achlya flagellata and Saprolegnia parasitica appeared virulent, while scaly-fish were more vulnerable to fungal infection than the non-scaly fish. The occurrence of fungal species, zoospore density and severity of mycoses was primarily governed by temperature. A water temperature between 22 and 25 degree C during spring stimulated fungal activity whereas, at above 28 degree C it retarded the disease process. All the species, except A. inflata and P. vexans have been reported virulent fish pathogens elsewhere this is cause of great concern. By virtue of a wide distribution and potentiality to parasitize eggs, fingerlings and adult fish, these fungi along with anthropogenic pressure are most likely to pose threat to reservoir fishery. Thus, research on integrated management of fish mycoses is warranted.

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Accession: 003237292

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