How do you tell the difference between a male and female Tiger Oscar fish?

Answer

It is hard to determine the sex of male and female tiger oscar fish. The male does get larger than the female, but that is not an accurate way to sex them. If you are lucky, you can tell when they are mating. However, you can look at the underside of the fish and if you see a small opening near the anus of the fish, then it is a female.
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