Abstract
Abstract Variation in total length for a population of channel catfish (Ictalurus punctatus) was evaluated by marking fish of discrete sizes within the population at stocking. At harvest, the variation of the overall population and of the marked fish was determined. Marked channel catfish subpopulations maintained their size ranking and had reduced variability relative to the overall population (SDs, 2.07–2.15 for the marked groups versus 2.82 for the total population). The coefficient of variation (100 × SD/mean) for the total population declined from 12.4% at stocking to 8.8% at harvest; coefficients of variation for the marked groups were 6.2–7.3% at harvest. Apparently, variability at harvest is due to both stocking variability and differential growth rates.
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