The distribution of an AVT V1a receptor in the brain of a sex changing fish, Epinephelus adscensionis

► This is the first comprehensive distribution of an AVT V1a receptor in teleost fish. ► We designed an antibody against rock hind AVT V1a receptor third intracellular loop. ► Protein and mRNA mainly in cell bodies and highest in granular formations. ► Expression in regions associated with behavior, reproduction and spatial learning. ► Expression in regions associated with vision, olfaction and lateral line function.