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Walleye Culture Research, Making a Great Product Better!
In 2012, performace and survival of lake and river strain fry 3 to 35 day post hatch fed Otohime diets was compared to pond raised fry. Evaluation of vitamin D supplement top dressed onto Otohime diets fed to each strain was also compared to Otohime diet without supplemental vitamin D coating. Growth and survival of fry fed the vitamin D diet was similar to the performance of fry fed the noncoated control diet, regardless of fry strain. Survival of river strain fry (75.8%) was greater than the survival of lake strain fry (66.7%) to 35 days post hatch. However, fry produced by intensive culture were 0.67 g and larger than those produced in ponds which were 0.47 to 0.56 g. Intensive fry culture method offers an alternative to pond production and results in good survival rates and predictable growth rates.
Alternative diets for feeding walleye from fingerling to fall stocking size were also compared in 2012. Standard WG 9206 was compared to an experimental WG formula with poultry meal replacing some fish meal and a Salmon diet. At the end of the 70-day trial, walleye fed WG 9206 were significantly longer than walleye fed WG experimental or salmon diet, by 5.4 mm and 12.3 mm, respectively.