Application of liquid oxytetracycline in formulated feeds to mark and treat tiger muskellunge

When added to pelleted diets, liquid oxytetracycline (500 mg/kg of fish per day) was effective in marking (after 12 d) and disease treatment (after 3 d) of tiger muskellunge (the hybrid of northern pike, Esox lucius, and muskellunge, E. masquinongy). Liquid oxytetracycline is more easily applied and costs less than traditional methods for these purposes.