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I'm thinking female but it hard to tell you need a clear shot of the pectoral fin and the underside of the goldfish near the anal fin, my two male Japanese svr has hundreds of tiny white bump on their pectoral fin my female Chinese Ranchu didn't have that, but her anal was sticking out alot because she was full.of eggs and ready to release them anytime
 

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Sexing Goldfish!

it's been a while since i've had goldfish, but my males always had the tiny white bumps on the gill covers.
You are right snafu and mistergreen. They usually appear around 2 years of age, when they are ready to breed. I'd say if it is older than 2 yrs old, it is a female. If it is younger you will have to wait for awhile longer to be certain.
 
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