Evaluation of Tank Shape and a Surface Spray for Intensive Culture of Larval Walleyes Fed Formulated Feed

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Abstract
Experiments were performed at Rathbun State Fish Hatchery, Moravia, Iowa, to evaluate cuboidal and cylindrical tank designs for the intensive culture of larval walleyes (Stizostedion vitreum) fed formulated feed. Three experiments (T-1 to T-3) were carried out in the spring of 1991. In experiments T- 1 and T-2, each tank design was replicated three times and each tank was equipped with a surface spray. Experiment T-3 was undertaken to preliminarily evaluate the role of surface spray in gas bladder inflation, an important factor in survival of the larvae. Gas bladder inflation (GBI) occurred in 71.5–100% of the fish that survived 15–25 d posthatch (means of two or three tanks per treatment over all experiments) for tanks with surface sprays. Gas bladder inflation occurred in a significantly greater proportion of fish reared in cylindrical tanks than fish reared in cuboidal tanks in two of the three experiments (T-2 and T-3). Viability, the percentage of the initial stock that survived to the end o...

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