1. Different colors: Black gold red-headed rat fish is a rare variety of rat fish. Breeders can look at their body color if they want to identify their sex. Normally, the body color of male fish is bright, while the body color of female fish is relatively dark.

2. Different pelvic fins: The obvious difference between female and male is their pelvic fins. The pelvic fins of female fish are round and those of male fish are sharp, but this difference can only appear after adulthood.

3. Different shapes: The female and male of the black gold red-headed rat fish in adulthood are also different. If the black gold red-headed rat fish is raised in a fish tank, the female fish will be fatter and look rounder. The male fish will be thinner and look smoother.

The male and female of the black gold red-headed rat fish can be raised together. If the breeder wants the black gold red-headed rat fish to breed, they can be raised together, because their requirements for water temperature, water quality and food are similar. In this way, when they are old enough to breed, they can pair and breed by themselves. If the breeder does not want them to reproduce, they can not be raised together, or they can be raised in isolation after they have matured. Whether they should be raised together depends on the individual wishes of the breeder.