Availability of Long-hour Bathing in Ammonia Water for the Control of Pseudodactylogyrosis in Cultured Eels

Abstract

The availavility of ammonia water long-hour bath for the control of pseudodactylogyrosis in cultured eels (Anguilla japonica) was investigated.
The parasites, Pseudodactylogyrus anguillae, obtained from the gills of infected eels were completely killed in vitro by 24h treatment of 15.6ppm ammonia at 25°C. Satisfactory anthelmintic effect was obtained when the infected eels were bathed in 15ppm ammonia for 18h at 25°C. The maximum safety concentrations of ammonia for bath on eels were 39.5ppm in two culture water at different pH (6.6 and 7.4) .
The results in this study suggested that the ammonia water long-hour bath might be one of the effective methods for controlling pseudodactylogyrosis in eel culture ponds.