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Parasitic agents, such as helminths, are the most important biotic factors affecting aquaculture, and the fluke  Centrocestus formosanus  is 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 of  Bacillus thuringiensis  against  C. formosanus  metacercariae  in vitro  using two concentrations of total protein, and only six strains produced high mortality. The virulence (CL 50 ) on matacercariae of three strains was obtained: the GP308, GP526, and ME1 strains exhibited a LC 50  of 146.2  μ g/mL, 289.2  μ g/mL, and 1721.9  μ g/mL, respectively. Additionally, these six  B. thuringiensis  strains were evaluated against the cercariae of  C .  formosanus ; the LC 50  obtained from the GP526 strain with solubilized protein was 83.8  μ g/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.

Anthelmintic Effect ofBacillus thuringiensisStrains against the Gill Fish TrematodeCentrocestus formosanus