Efficacy testing of orally administered praziquantel to common carp naturally infected by caryophyllidean tapeworms (Platyhelminthes: Eucestoda)
2010
Sudova, E.,Jihoceska Univ., Vodnany (Czech Republic). Vyzkumny Ustav Rybarsky a Hydrobiologicky | Piackova, V.,Jihoceska Univ., Vodnany (Czech Republic). Vyzkumny Ustav Rybarsky a Hydrobiologicky | Velisek, J.,Jihoceska Univ., Vodnany (Czech Republic). Vyzkumny Ustav Rybarsky a Hydrobiologicky | Pijacek, M.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic) | Svobodova, Z.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic)
The aim of this study was to assess the effects of orally applied praziquantel on the treatment efficacy against most abundant tapeworms (Atractolytocestus huronensis and Khawia sinensis) of common carp. Naturally infected fish (1.5-year-old; K1-2) were divided into 6 groups. Three trial groups were administered praziquantel mixed in heat-treated amyloid vehicle (at doses of 50 mg/kg body weight). In 3 groups of control, the fish were administered amyloid vehicle only. Fish were examined using gut dissection 2, 4 and 6 days after the administration. The location, intensity and prevalence of individual species of tapeworms were recorded. A. huronensis and K. sinensis were found in the gut of carp together. A. huronensis was situated in the oesophageal part of the foregut, and K. sinensis came after - immediately before the first intestine loop. The invasion of A. huronensis was fully eliminated in all trial groups after 4 days, whereas some specimens of K. sinensis still persisted in the gut of few fish. The full elimination of both parasites was observed 6 days after administration. Our results showed that elimination of K. sinensis takes longer than elimination of A. huronensis. The dose of 50 mg/kg of orally administered praziquantel is efficient to control A. huronensis and K. sinensis infections in common carp. However, a significant decrease of the number of parasites was also caused by a single oral administration of big bolus vehicle and leaving unfed fish in the clean water.
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