My watanabeis pair is more "pair"er than ever. The males seems to ahve become more male over time. The females chronioc pesters him for spawning, and then he gets mad and chases her around. Real white,... well I guess blue trash.
Bear in mind this- flashy males are at a very distinct disadvantage, in a functional ecological sense. Brighter, fdlashier fish are more obvious to predatiors. The main benefit to this is sexual selection from mates. MAny species will adjust their appearance to help counteract this. For example, a huge number of birds will have breeding plumage, and non-breeding, or eclipse, plumage. Is it possible these males are really NOT reverting to females, but just dulling down the colors, as breeding isnt prevalent, and they see no reason to draw attention to themselves (not willful decisions, obviously). In my scenario, there are certain cues which would cause the reversal back to male. Prehaps a "better" chance of breeding (more females, more room, certain foods, who knows???), or more sexual competiton (another male). Just spitballing.
