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The orexigenic agouti-related protein (AgRP) and the anorexigenic pro-opiomelanocortin (POMC) are crucial players in the control of feed intake in vertebrates, yet their role in teleosts has not been fully established. Triplicate groups of Atlantic salmon ( Salmo salar ) post smolts were subjected to (1) fasting for 3 days (fast) and (2) normal feeding (fed), resulting in a significant ( p  < 0.05) upregulation of hypothalamic  agrp1  transcripts levels in the fast group. Moreover, the mRNA abundance of  agrp1  was significantly ( p  < 0.05) correlated with the stomach dry weight content. Corresponding inverse patterns were observed for  pomca2 , albeit not statistically significant. No significant differences were found for the other paralogues,  agrp2  and  pomca1  and  b,  between fed and fast groups. The significant correlation between stomach fullness and  agrp1  mRNA expression suggests a possible link between the stomach filling/distension and satiety signals. Our study indicates that hypothalamic  agrp1  acts as an orexigenic signal in Atlantic salmon.

Hypothalamic agrp and pomc mRNA Responses to Gastrointestinal Fullness and Fasting in Atlantic Salmon (Salmo salar, L.)