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- Title
Identification of an Achlya klebsiana Isolate as the Causal Agent of Saprolegniosis in Eggs of Yellow Catfish (Pelteobagrus fuvidraco) and Control with Herbal Extracts.
- Authors
Haipeng Cao; Renjian Ou; Shan He; Xianle Yang
- Abstract
Achlya species have been implicated in significant fungal infections of live fish and their eggs. In the present study, an oomycete water mold (strain YC) was isolated from yellow catfish (Peleobagrus fulvidraco) eggs suffering from saprolegniosis and characterized morphologically and by its internal transcribed spacer (ITS) gene sequence. Based on its morphological features, the mold was initially identified as an Achlya sp. isolate. Using the neighborjoining method to construct a phylogenetic tree, the YC strain was closely related to A. klebsiana strain CBS101.49 (GenBank accession no. AF119579), previously recorded as infecting plant roots as well as fish. Aqueous extracts from 31 Chinese herbs were screened as possible anti-Achlya agents. Of these, a 10 mg/ml extract from Rhizoma coptidis was the most efficacious. Significant protective efficacy of 66.34% and 92.20% was obtained against the YC strain in fish eggs by the R. coptidis extract provided at concentrations of 256 mg/l and 1280 mg/l, respectively.
- Subjects
FLATHEAD catfish; FISH eggs; HERBAL medicine; MYCOSES; ACHLYA
- Publication
Israeli Journal of Aquaculture-Bamidgeh, 2013, Vol 65, p1
- ISSN
0792-156X
- Publication type
Article