A male what to a female what? Sexual dimorphism in fish varies from one fish species to another, the same way it does from one bird to another. Male and female blue jays are virtually identical in appearance. Male and female cardinals look quite different.
Never trust a tall dwarf... he's lying about something.
well it basicaly depends on what type of fish your talkin about. I mainly know about live breeders. so if your talkin about a live breeder, (molly, plattie, sword tail, and guppy) then you can tell the diffrence by there anal fin. which is right where they poo adn the last fin on there underside next to there tail. if the fin is strait, then it is a male. if it's fanned out then it's a female.
most fish owners don't want any baby fish to worry about, so the best thing you can do is get all male fish, this way there is no chance of ending up with babys.