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Some fish show no visible differences in the sexes while in others the differences are very large and obvious. It all depends on the Genera and species of fish and sometimes also the sub species.

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14y ago
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10y ago

what species of fish? every one is different. some are very easy like guppies, some are a little more challenging like tetras, and some are completely impossible such as Oscars.

if its a goldfish, you can't sex them until they're over a year old and only during the spawning season in spring, males develop little white pimples on the gill cover.


there are a few oddballs, the amazon molly (not the black molly or sailfin molly you see in petstores), the entire species is female, no males at all. and some species of Saltwater Fish such as some clownfish and anthias can change from female to male if not enough males are present.

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12y ago

You need goldfish that are at least 2 years old

(That's when they are old enough to mate).

You can tell most easily when it is spring, and the male goldfish have small dots on their fins. They mate in the summer.

Also, female goldfish tend have more livid colors than the male goldfish. This is not true for all fish.

If there happens to be a male and female goldfish in the same tank, the male chases the female regularly and appears to attack it.

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11y ago

The sex can't be known in some species except by internal inspections.

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Q: How do you tell a girl fish apart from boy fishes?
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