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Goldfish Anatomy


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well the males will get breeding spurs on their gill covers and the leading ray of the pectoral fin. The breeding spurs look like little spots of ich.

I sex fish by their anal vent. But this is easier to do on bigger fish. I have trouble on anything smaller than 3.5" because it's just too hard to tell.

Females have a bit of an outie for an anal vent, and males have an innie.


PS. Here is a great description with pictures! http://www.kokosgoldfish.invisionzone.com/forum/index.php?/page/index.html/_/goldfish-keeping-tips/sexing-goldfish-r339

Edited by Helen
updated broken link
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Very interesting image, and a great way to combine two things you were learning about.

Thanks for all you do, Koko

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