Abstract
The antifungal efficacy of copper fiber against water mold infection in rainbow trout Oncorhynchus mykiss eggs was evaluated by the percentage of eggs with fungal infection. Copper fiber was put into the upstream of an egg breeding tank and rainbow trout eggs were soaked into the downstream of the same tank.Water mold infection in eggs was lower in the groups with copper fiber set in the water than that in the control group. Effects of copper on the embryonic devebpment of the eggs were also examined for two weeks with the copper fiber soaked in the water.The concentration within the range from 0.006 to 0.020 ppmd id not showed apparently adverse effects on the rate of eyed eggs or, after transferring eggs in the water without copper, on the rates of hatching or deformity. The solution prepared from copper nitrate reagent prevented the zoospore germination of Saprolegnia diclina at the concentration of 0.006 ppm in vitro.
