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Development of a method for reproducing epizootic ulcerative syndrome using controlled doses of Aphanomyces invadans in species with different salinity requirements

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Date
2002
Author
Catap, Elena S.
Munday, Barry L.
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Abstract
Lesions typical of epizootic ulcerative syndrome (EUS) were induced in three-spot gourami, Trichogaster trichopterus, and sand whiting, Sillago ciliata, injected intramuscularly with controlled doses of Aphanomyces invadans zoospores, the fungal pathogen associated with the disease. Both species of fish exhibited chronic granulomatous response and inflammatory cells, predominantly macrophages and lymphocytes, infiltrated the muscle and skin tissues, at days 6–8 post-inoculation of 65 to 85 spores/fish. Based on the comparative granuloma counts and percentage of cellular infiltration in a sampled lesion area using image analysis, it was shown that the three-spot gouramis mounted a more vigorous response than the sand whiting. It was also observed that lesions in three-spot gouramis exhibited early signs of resolution than those in sand whiting. However, fish mortality was greater in EUS-affected three-spot gourami than in EUS-affected sand whiting. With this technique, we were able to describe and compare the sequential histopathology of EUS lesions in a freshwater (three-spot gourami) and an estuarine (sand whiting) fish species.
URI
http://hdl.handle.net/10862/1922
Suggested Citation
Catap, E. S., & Munday, B. L. (2002). Development of a method for reproducing epizootic ulcerative syndrome using controlled doses of Aphanomyces invadans in species with different salinity requirements. Aquaculture, 209(1-4), 35-47.
DOI
10.1016/S0044-8486(01)00805-5
Subject
Brackishwater fish; Defence mechanisms; Freshwater fish; Fungal diseases; Histopathology; Immunity; Lesions; Lymphocytes; Macrophages; Salinity effects; Spores; Muscles; Skin; Aphanomyces invadans; Sillago ciliata; Trichogaster trichopterus; Sand whiting; Three-spot gourami; Epizootic ulcerative syndrome
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