Nutritional regulation of insulin-like growth factor-I mRNA expression in barramundi, Lates calcarifer

S J Matthews, A K K Kinhult, P Hoeben, V R Sara, T A Anderson

doi:10.1677/jme.0.0180273

Nutritional regulation of insulin-like growth factor-I mRNA expression in barramundi, Lates calcarifer

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<jats:title>Abstract</jats:title> <jats:p>The effect of nutritional status on IGF-I mRNA expression in the liver and brain of juvenile barramundi (<jats:italic>Lates calcarifer</jats:italic>) was investigated. Fish were either fed a satiety ration (SAT) or starved (STV) for 6 weeks. Starved fish demonstrated significantly lower condition factor and hepatic IGF-I mRNA expression at 3 and 6 weeks, when compared with the SAT group. IGF-I mRNA expression in the brain was 10 fold lower than the liver and was not affected by ration size. These results suggest the liver is the major site of IGF-I mRNA synthesis and hepatic but not brain IGF-I mRNA expression is regulated by food availability in juvenile barramundi.</jats:p>