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If he knows the usual ways of identifying the sexes and they are not working for this one fish then there is nothing else to do.
Goldfish are very hard to sex until they become sexually matured.
And the oranda are especially hard, because of the hood on the head and they have fatter, more rounded abdomen than do even regular fantails.
The best you can do is to keep this fish with known gender goldfish and just watch them.
Good luck.
Write paranormal mysteries. Six books so far.
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