SOMATOLACTIN AND GROWTH HORMONE ARE DIFFERENTIALLY CORRELATED TO VARIOUS METABOLIC PARAMETERS IN TROUT

摘要

The effect of starvation on plasma hormone and metabolite levels in rainbow trout (Oncorhynchus mykiss) was investigated. Plasma somatolactin (SL) levels were found to be significantly lower in starved than in fed fish, whereas plasma growth hormone (GH) levels were significantly elevated during starvation. Changes in plasma free fatty acids, glucose, protein, amino acids and liver glycogen occurred as expected in the starved fish. Regression anal!;sis indicated that both SL and GH iel-els were significantly correlated to most of the metabolic parameters measured; however: the regression lines for SL and GH were always opposite to each other. The results indicate that SL, as well as GH, may be involved in some aspect of energy metabolism control.