Consequently, it appears walleye have not successfully reproduced in Norris Reservoir since 1994. Concurrent with the reproductive failure of walleye has been a significant increase in the abundance of alewife. Alewife CPUE has increased significantly since 1994 and are now the most abundant clupeid inhabiting the reservoir. We sampled walleyes with trap nets during the spring spawning run in March and April and by electrofishing in September 1997. Scales, dorsal spines, and otoliths were used to estimate ages.
Growth is rapid prior to sexual maturity, and slow thereafter.
Hydrogen peroxide is being evaluated for its potential as a chemotherapeutic compound for a variety of external disease organisms in fish. Research in our laboratory has focused on delineating effective H2O2 treatment regimes for bacterial gill disease in salmonids and walleye. Results from target animal studies indicate that toxicity of H 2 O 2 is dependent on species, age, dose and water temperature. The value of hydrogen peroxide as a therapeutic compound for use in walleye culture has been questioned due to the high sensitivity of walleyes to this compound. The concentration of hydrogen peroxide required for therapy exceeds that which can be tolerated by walleyes.