The effects of dietary supplements on juvenile salmonid growth and plasma growth hormone

TL;DRAbstract

Growth hormone (GH) concentrations in the plasma of two species of juvenile salmonids were determined before and after four compounds were administered by either: a ) dorsal aortic cannula (rainbow trout) or; b ) incorporated with commercial fishfeed (coho salmon). The compounds used were: 1) branched chain amino acids (BCAA); 2 ) arginine aspartate (AA) ; 3 ) gamma-aminobutyr ic acid (GABA) and 4 ) clonidine. Coho salmon juveniles were examined for increases in overall growth (weight and length) and relationships between GH concentrations and size. Plasma growth hormone concentrations in cannulated trout were increased after injection of either BCAA (212%) or GABA (862%) while AA or clonidine had no significant effect. 'coho yearlings fed any of the supplements for 56 days showed no significant increases in either weight or length, but plasma GH was increased by BCAA, GABA or clonidine. Yearlings given BCAA had significantly higher plasma GH levels after 42 days (264%). GABA treated y

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