METHODS TO CONTROL EGG MORTALITY ASSOCIATED WITH AQUATIC FUNGUS (SAPROLEGNIA SPP.) INFECTING HYBRID STRIPED BASS EGGS
Harry K. Dupree Stuttgart National Aquaculture Research Center
2013 Annual Report
1a.Objectives (from AD-416):
Develop a therapeutic treatment regimen to minimize the effects of aquatic fungus (Saprolegnia spp.) infecting hybrid striped bass eggs and causing economic losses to the producer.
1b.Approach (from AD-416):
Improved fungus control has been established on catfish eggs from ongoing ARS research at SNARC. Fungus on eggs also causes severe losses in the hybrid striped bass industry. Because of the time-sensitive nature of this research and the rapid hatching of eggs, this research will be conducted at the participating fish farm. Two known treatments for aquatic fungus (copper sulfate and peracetic acid) will be tested at several concentrations to determine their effectiveness.
This project investigated the effectiveness of copper sulfate and peracetic acid to prevent fungus on sunshine bass eggs and to increase survival of larvae. The cooperator provided facilities and expertise in sunshine bass spawning which allowed SNARC researchers to collect and analyze data to determine effectiveness and percent survival. Copper sulfate results in higher survival of larvae through the hatching stage and reduction of fungus.