How can I tell the sex of my goldfish?

Jason

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I think in mature goldfish the males will have weird spot/hump thingys near their gills and pectoral fins
 

Butterfly

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This is as close as I can get to sexing Goldfish.

Carol
 

Jason

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Have a look at that from what Ive read that is the most accurate way of distinguishing. I think the males have to be about 1yr old.
 

jinx_beta

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There is no reliable way to tell the gender of young goldfish.
However, during the fishes breeding season, if you look to see if the fish has white pimple-like bumps on their heads and gill covers, then that fish is most probably a male. The bumps are called 'breeding tubercles' and they develop just before the breeding season. But after the season ends, these bumps gradually fade away (or are locked up until next season).
Another way to tell the sex of your goldfish is to have a look at the colour of their scales during breeding season. The males colour intesifies, to impress the female (dur!

Hope this information helps,

Kristyn
 

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