Dietary effects on biomarkers of growth, stress, and welfare of diploid and triploid Atlantic salmon (Salmo salar) during parr-smolt transformation

Triploidy is induced in Atlantic salmon (Salmo salar) to produce sterile fish for genetic containment and hinder early sexual maturation farmed fish, but it can have unwanted negative effects on growth, health, welfare. However, the growth welfare of triploid may be improved by adjusting rearing environment, feeding conditions diets. This study evaluated physiological changes used a suite biomarkers assess potential impact diet diploid during parr-smolt transformation. Diploids triploids, held at low temperature, were fed standard feed or one with hydrolyzed proteins thought suitable salmon. Fish muscle was collected monthly from October December (2454–3044 degree-days post-start feeding, ddPSF) analysis biomarkers, progress transformation monitored using seawater challenge test. Real-Time PCR radioimmunoassay stress response (expression genes GH-IGF axis HSP70; cortisol concentrations), oxidative lipids (MDA) (AOPP) assayed. Changes related sampling time rather than being associated ploidy, compatible progression Growth expressions similar those their counterparts, there no evidence that employed resulted responses elicited. Overall, indicators this did not point any dietary performance undergoing