EFFECT OF lVERMECTIN, PYRANTEL AND MORANTEL ON THE EUROPEAN EEL AND ITSMONOGENEAN PARASITES

Materials and methods Parasiticidal effect: Small pigmented eels infected by a mixed population of Pseudodactylogyrus bini and P. anguillae, app. 3 weeks post-infection, were exposed to different concentrations of ivermectin (Ivomec, injectable), pyrantel citrate (BanminthR vet.) and morantel tartrate (Table 1). Exposure was conducted as waterbath treatments for 24 h at 25°C in 7 I aerated drug solution in 17 I aquaria. After treatment, surviving eels were transferred to clean water and examined for gill parasites after 4 days. Data for eels and infection levels are shown in Table 1. Toxicity of ivermectin: Groups of eels (each comprising 13 to 16 specimens) were exposed to eight concentrations of ivermectin (Ivomec 10 mg/ml, injectable) and the percentage of eels showing no signs of paralysis was recorded during 24 h (Fig. 1). Paralysis of eels was detail, as this drug has been used agains1 fish parasites with varying success (Heckman, 1985; Hyland and Adams, 1987; Palmer et al., 1987); Taraschewski et al., 1988) ..