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Isolation and characterization of Saprolegnia parasitica from cage-reared Pangasianodon hypophthalmus and its sensitivity to different antifungal compounds
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Isolation and characterization of Saprolegnia parasitica from cage-reared Pangasianodon hypophthalmus and its sensitivity to different antifungal compounds
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Journal Article
Isolation and characterization of Saprolegnia parasitica from cage-reared Pangasianodon hypophthalmus and its sensitivity to different antifungal compounds
2024
Overview
Saprolegniasis is one of the most dangerous fungal diseases of fish, causing significant mortality in fish hatcheries and young ones. The present study aimed to isolate and characterize the causative fungus from fingerlings of
Pangasianodon hypophthalmus
cultured intensively in freshwater cages in Indian reservoirs and to determine minimum inhibitory concentrations of different antifungal compounds against the fungal hyphae and zoospores. The fungal isolates grown on potato dextrose agar showed an abundance of gemmae, elongated mycelia, non-septate hyphae, primary zoospores, mature zoosporangia with numerous zoospores, cysts with bundles of long hairs and were further identified as
Saprolegnia parasitica
following PCR amplification and sequencing of internal transcribed spacer region.
S. parasitica
showed temperature-sensitive optimum growth in a narrow window of 12–24 ℃, which might drive its experimental pathogenesis as well as natural infections in the winter months. In vitro sensitivity testing established negligible inhibitory activity of fluconazole, boric acid, sodium thiosulfate, and potassium permanganate while clotrimazole arrested the spore and hyphal growths at 2 mgL
-1
concentration suggesting potential of the imidazole antifungal in treating
S. parasitica
infection in fish. The present study will serve as the baseline information for developing therapeutic and management strategies for controlling saprolegniasis in the economically significant iridescent catfish.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 631/326
/ 631/601
/ Animals
/ Antifungal Agents - pharmacology
/ Catfish
/ Disease
/ Fish Diseases - drug therapy
/ Fish Diseases - microbiology
/ Fish Diseases - parasitology
/ Fungi
/ Humanities and Social Sciences
/ Hyphae
/ Hyphae - growth & development
/ Potassium Permanganate - pharmacology
/ Proteins
/ Science
