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Keywords:

  • albino strain;
  • bath anaesthesia;
  • grey strain;
  • MS222

The efficacy of immersion anaesthesia with tricaine methanesulphonate (MS222) or propofol on albino and grey silver catfish Rhamdia quelen was assessed through induction and recovery times and observation of mortality. Besides reporting a novel, efficient and practical use of propofol as an immersion anaesthetic, the study shows that it is essential to consider size and strain when anaesthetizing R. quelen with MS222 or propofol bath solution in order to minimize physiological impact.