Abstract
The antiparasitic efficacies of 9 benzimidazoles in commercially available formulations were tested (water bath treatments) on small pigmented eels Anguilla anguilla, experimentally infected by 30 to 140 specimens of Pseudodactylogyrus spp. (Monogenea). Exposure time was 24 h and eels were examined 4 to 5 d post treatment. Mebenedazole (Vermox: 1 mg l-1) eradicated all parasites, whereas luxabendazole (pure substance) and albendazole (Valbazen) were 100% effective only at a concentration of 10 mg l-1. Flubendazole (Flubenol), fenbendazole (Panacur) and oxibendazole (Loditac) (10 mg l-1) caused a reduction of the infection level to a larger extent than did triclabendazole (Fasinex) and parbendazole (Helmatac). Thiabendazole (Equizole), even at a concentration as high as 100 mg l-1, was without effect on Pseudodactylogyrus spp.

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