OBSERVATIONS ON HYDROGEN-PEROXIDE CONTROL OF SAPROLEGNIA SPP. DURING RAINBOW-TROUT EGG INCUBATION

Daily treatments of 250, 500, and 1,000 mg hydrogen peroxide/L for 15 min were evaluated for fungal control on incubating eggs from two stra ins of rainbow trout Oncorhynchus mykiss. Observed infection rates and egg clumping were extensive enough in incubator trays receiving treat ments of 250 or 500 mg hydrogen peroxide/l to make egg and fry handlin g difficult. The 1,000 mg/L treatment provided fungal control similar to daily formalin treatments of 1,667 mg/L for 15 min. Despite the dif ferences in infection rates and clumping, egg survival was not affecte d by any of the treatments used.