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Heritability of Body Size Traits, Dressing Weight and Lipid Content in Channel Catfish

Coastal Plain Experiment Station, Tifton, GA 31794²

Abstract

The heritability of body weight, five body measurements, absolute and relative dressing and head weights and lipid content (DW) were estimated in 48-week-old channel catfish. Data were from the progeny of 13 sires each mated to two dams and each having nine offspring of each sex. They were reared in three replicate tanks under conditions of warm-water and high-density culture. For most traits the estimate from the dam component of variance (h²_d) was higher than from the sire component (h²_s) indicating dominance, epistasis and/or common environmental effects. h²_s was higher in the females than in the males, indicating sex linkage. The ratio of tank variance to total variance ranged from zero for lipid content to .24 for body depth of females.

In both sexes h²_s of total length was high .3), h²_s of body depth and interorbital width were intermediate (.1h²_s<.3), and h²_s of dressing % and head % were nil. h²_s of body weight, girth, head length, and dressing and head weights were high in the females but intermediate in the males. Lipid content h²_s was .08 in the females and nil in the males.

¹ Faculty of Agriculture, Alexandria, Egypt.

² Department of Entomology and Fisheries.