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Somatolactin and Growth Hormone Are Differentially Correlated To Various Metabolic Parameters in Trout

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

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 analysis indicated that both SL and GH levels 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.

Affiliations: 1: Dept. Biology and Biochemistry, Brunel University, Uxbridge, Middlesex UB8 3 PH, England; 2: Institute of Freshwater Ecology, Windermere Laboratory, Far Sawrey Ambleside, Cumbria LA 22 OLP, England; 3: Eurogentec S.A., Parc de Recherche de la Cense Rouge, rue Bois Saint Jean 14, 4102 Seraing, Belgium


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