Abstract
Abstract Fifteen full-sib channel catfish (Ictalurus punctatus) families from the Yazoo strain and eight from the Louisiana State University (LSU) strain were tested for variability in mortality rate at a low level of dissolved oxygen (1.1 ± 0.1 mg/L [ppm]). Channel catfish fry ranging from 2 to 10 days of age were subjected to low dissolved oxygen shock tests for 10-hour periods following 12-hour acclimation. There was no significant difference between the LSU and Yazoo strains in mortality. No significant differences were detected among age groups of fry (3 and 4; 5 and 6; 7 and 8; and 9 and 10 days old). There were highly significant and significant intra-class correlations among the full-sib families, indicating that families differed either in total genotypic value or due to environmental effects common to full-sib groups.
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