Anthelmintic Effect ofBacillus thuringiensisStrains against the Gill Fish TrematodeCentrocestus formosanus

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Abstract
Parasitic agents, such as helminths, are the most important biotic factors affecting aquaculture, and the flukeCentrocestus formosanusis considered to be highly pathogenic in various fish species. There have been efforts to control this parasite with chemical helminthicides, but these efforts have had unsuccessful results. We evaluated the anthelmintic effect of 37 strains ofBacillus thuringiensisagainstC. formosanusmetacercariaein vitrousing two concentrations of total protein, and only six strains produced high mortality. The virulence (CL50) on matacercariae of three strains was obtained: the GP308, GP526, and ME1 strains exhibited a LC50of 146.2 μg/mL, 289.2 μg/mL, and 1721.9 μg/mL, respectively. Additionally, these sixB. thuringiensisstrains were evaluated against the cercariae ofC.formosanus; the LC50obtained from the GP526 strain with solubilized protein was 83.8 μg/mL, and it could be considered as an alternative control of the metacercariae and cercariae of this parasite in the productivity systems of ornamental fishes.
Funding Information
  • National Council of Science and Technology (482258/276615)

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