Dietary Supplementation of Chromium Picolinate does not affect Growth Performance and Feed Conversion Ratio of Rainbow Trout (Oncorhynchus mykiss)

Aims: A growth experiment was conducted to explore the impact of dietary chromium on the growth performance and feed conversion ratio of rainbow trout (Oncorhynchus mykiss).

Study Design: Original Research Article

Place and Duration of Study: Fisheries Research Station (FRS), Trishuli Nepal, between November 1 to January 29, 2023.

Methodology: A total of 270 healthy and equal sized- O. mykiss (initial weight: 27g) were fed on a non-supplemented basal diet (Cr-Pic0), or a basal diet supplemented with 0.4g/kg Cr-Pic (Cr-Pic0.4), or a basal diet supplemented with 1.2g/kg Cr-Pic (Cr-Pic1.2) for 90 days. Each diet was randomly assigned to three replicate groups of 30 fish per flowthrough raceway tanks for 90 days and fed to apparent satiation twice daily.

Results: Upon conclusion of the feeding trial, the results showed no significant differences in final weight, weight gain, specific growth rate, or condition factor among treatments (P>0.05). There were also no significant differences in the survival rate and feed conversion ratio of the rainbow trout fed various experimental diets (P>0.05).

Conclusion: The results suggest that growth performance, food conversion, and survival of rainbow trout fingerlings are not affected by 0.4 or 1.2 mg/kg supplementation of Cr-Pic in diet.