Gnrh receptor gnrhr2bbα is expressed exclusively in lhb-expressing cells in Atlantic salmon male parr.

•The Atlantic salmon genome contains 6 Gnrh receptor paralogous genes.•Phylogenetic analysis confirms the presence of two main types of vertebrate Gnrhr.•One paralog, gnrhr2bbα, is expressed specifically in lhb-cells in salmon.•Pituitary expression of gnrhr2bbα increases in maturing fish.•Pituitary expression of gnrhr2bbα shows seasonally dependent daily fluctuations.