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A goldfish's gender will be very hard to determine before the goldfish is three years old. After this point, the male will develop little white pimple-looking things on his gills. These are called breeding stars. A female's fins will be more rounded and her tail will be convex.

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10y ago
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13y ago

The female has a larger butt. This is the best way to tell a female from a same sized male.

The female goldfish has a fanned fin and the male has a fin that sticks out.

Males always chase females around the aquarium most of the time. So the chaser is nearly always male, and the chase is female.

When boy goldfish want to mate, they get white spots on their tail. If your goldfish has a spotty tail, it's definitely a male. If it doesn't, it's a girl or a boy who's just not ready yet.

The male will develop white bumps on their gills and the females stomach area will enlarge as she fills with eggs. Also, the female will have a slightly larger and protruding vent. And they will also look lopsided.

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15y ago

rip it open and if the guts are purple its a girl LOL

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11y ago

A female goldfish grows at a slower rate then a male goldfish

wrong!!!!!!!!!!!!!!!

- A girl goldfish has a protruding anus, a male does not.

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14y ago

All goldfish are sexed the same way. During their breeding season the males develop white spots on their gill plates and pectoral fins. The females simply get a chubby tummy.

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12y ago

you cant, :)

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12y ago

he was a guy

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11y ago

She's the one wearing the bra.

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Q: How do you tell a goldfish from boy to girl?
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