Abstract
Abstract Differences in channel catfish fingerling growth rate were evaluated in triplicate aquaria fed at either 3% or 4% of body weight daily with feeding rate adjustments being made on the basis of (1) weight of the fish in each tank within a treatment, (2) mean weight of all replicates within a treatment, (3) weight of the slowest growing fish within a treatment and (4) weight of the most rapidly growing fish within a treatment. Significant differences between feeding rates were not elaborated over an 11 week feeding trial when the first and third feeding rate adjustment techniques were employed. The first method, utilizing individual tank weights for feeding rate adjustment, is the most common one utilized in feeding trials. Our recommendation is that it be retained as the standard technique. The low sensitivity of the technique reinforces the view that significant differences, when detected, are biologically important and not an artifact of experimental design.
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