Dorsal fins and so subjective indication... I have Blenny for 8 months now and every time I'm trying to decide whether his fin is higher then the rest I'm changing my mind Is there any other indication?
IME, the female's dorsal folds neatly and stays completely along the spine. The male's is quite a bit longer when folded and usually droops toward one flank. I know dorsal size applies to dragonets like scooter blennies, but I'm not sure it applies to all blennies though.