Growth, fillet yield, and muscle quality traits are not affected by a genotype by diet interaction in rainbow trout consuming diets that differ in lipid content

Abstract

In this study, selectively bred rainbow trout (Oncorhynchus mykiss) with improved fillet yield were reared on three commercially available diets that varied in dietary lipid content: low lipid (LL, 18%), moderate lipid (ML, 24%), and high lipid (HL, 29%–33%). The objective was to determine if a genotype by diet interaction affects product yield and muscle quality traits in high fillet yield (HY) and low fillet yield (LY) lines of rainbow trout. Main effects of the genetic line (p < 0.05) were observed for viscera yield, carcass yield, and fillet yield that were more favorable in the HY line. Analysis of muscle quality traits indicated that selection for fillet yield did not compromise fillet quality. A genotype by diet interaction (p < 0.05) was observed for viscera lipid content at the 2 kg harvest, for which viscera lipid content was similar between the HY and LY lines for the LL and HL diets, but greater (p < 0.05) in the LY line for the ML diet. Collectively, these findings indicate that higher product yields in the selectively bred HY line of rainbow trout will persist across diets with variable crude lipid/energy contents.

Fecal Microbiome Analysis Distinguishes Bacterial Taxa Biomarkers Associated with Red Fillet Color in Rainbow Trout

“…This line started as a growth-selected line in 2002 and underwent five generations of selection for improved growth performance, as described by Leeds et al [39]. Subsequent generations were selected for muscle yield, as described in Cleveland et al [40] and Garcia et al [41]. Fish from the 2020 year class were included in this study and thus represent 3rd-generation families from lines selected for high (ARS-FY-H) or low (ARS-FY-L) fillet yield.…”