Toltrazuril (Baycox vet.) in feed can reduce Ichthyophthirius multifiliis invasion of rainbow trout (Salmonidae)
2011
Jaafar, R.M. | Buchmann, K.,University of Copenhagen, Frederiksberg (Denmark). Dept. of Veterinary Disease Biology
Various compounds have been applied for control of Ichthyophthirius multifiliis (commonly known as Ich) which is the parasitic pathogen, responsible for the white spot disease, in freshwater aquaculture worldwide. The presently reported study was performed to test the potential of toltrazuril - a drug licensed for treatment of coccidial infections in other animal species - to reduce Ich infections when administered orally. Commercial pelleted feed containing 5.0 or 2.5 mg toltrazuril per 1 g of feed was offered to rainbow trout, Oncorhynchus mykiss (Walbaum, 1792), during a three day feeding regime (1% of biomass offered per day). The feed with the high drug concentration was not eaten by the fish whereas all feed containing 2.5 mg per 1 g feed was eaten. Following the exposure to infective I.multifiliis theronts it was found that the fish treated with toltrazuril before challenge obtained a significantly lower parasite burden (number of trophonts in the skin) compared to untreated control
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