The effects of diflubenzuron immersion bath on sperm of jundiá Rhamdia quelen with Lernaea cyprinacea

Abstract

The effects of therapeutics products and other poluents over fish sperm have been research issues. The diflubenzuron (DFB) is widely used against fish ectoparasites. For USA and Europe, its use is restricted, due the large potential of environment impact; but in south of Brazil, is used by most of fishfarmers on 24 hours' immersion bath. The present study submitted 64 jundias (Rhamdia quelen), infested by Lernaea cyprinacea under four treatments (0,0mg/L; 0,01mg/L; 0,1mgmg/L and 1mg/L) at immersion bath during 24 hours. At final of experimental period, we carried through the collect and evaluation of fish sperm. No differences were found over evaluated parameters: volume, aspect (appearance and color), motility duration and concentration of sperm. The product showed inefficient as 24 hours' immersion bath against adult parasites and copepodites.