Sources of Variations in Body Size Traits, Dress-out Weight, and Lipid Content and Their Correlations in Channel Catfish, Ictalurus punctatus

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Abstract
Data on body weight, five body measurements, dress‐out weigbt, and lipid content were collected from 56‐week old channel catfish, Ictalurus punctatus, which belonged to 18 full‐sib families. Analyses of variance showed that: (1) all sex differences, except that in dressing percentage and lipid content, were significant (P < 0.01); (2) the sex component of variance in percent of total variance ranged from 0.0% for lipid content to 34.7% for interorbital width; (3) all family differences were significant (P < 0.01), while those between replicate tanks were insignificant (P > 0.05); (4) differences between families or individual fish contributed most to total variance while those between tanks and family X tank interactions contributed least; (5) in all characters observed, the family component of variance ranged from 12.6% (dress‐out %) to 49.2 % (head length) of total variance. Dress‐out weight was positively and highly correlated with body weight, body measurements, or head weight (r= 0.89 or more). The correlations between percent dress‐out and these characters were medium or small (r = 0.25‐0.54). With the exception of percent head weight, all other characters had medium or small correlations with lipid content (r = 0.15‐0.49). Percent head weight was negatively but moderately correlated with dress‐out weight, dress‐out percentage, and lipid content.

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