Abstract
Formalin administered twice daily as a flush at concentrations of 100, 200, or 400 mg/L increased percent hatch of channel catfish, Ictalurus punctatus, eggs relative to non-treated eggs (P < 0.05). Formalin at 400 mg/L was most effective in controling Saprolegnia sp. infections, and the resultant percent hatch was 93.7%. Iodine administered twice daily as a flush at concentrations of 50, 100, or 200 mg/L increased the hatching rate of channel catfish eggs relative to non-treated eggs (P < 0.05). Iodine at 200 mg/L increased percent hatch by 28% over that of the controls. Saprolegnia sp. infections were apparent on eggs exposed to all levels of iodine. Formalin was more effective in controlling Saprolegnia than iodine and consideration should be given to extending its label to include the treatment of channel catfish eggs.
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