How can you tell for a Oranda calico fantail and a goldfish fantail if it is a boy or a girl?

Answer 1

The easiest way to tell the difference is that the males may get what are called breeding stars on their gill plates during breeding season. The breeding stars look like small white bumps.

This is not always the case though, and sometimes the only way you know is by seeing the female drop eggs, or the male fertilizing the eggs.

Answer 2

Differentiating between a male & female goldfish is actually quite difficult for most. One good way is that during breeding season, a male will get breeding stars on his gill plates which look like small white bumps. For a female, the best way to know for sure is of course when she releases eggs.

Answer 3

If it is a smaller fish or brighter or bigger fins or a bigger v shape

Answer 4

a male fish is darker than a female fish