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I have these two fishes in 21 litres tank with filter the waterfall ones. I clean their tank every once a month. They are so happy and always active. I have gotten the orange fish since last year October I think? And the gold one since start of this year because I had two but other fish died so I got the gold one :) how can I tell if there age and female or male?

I have these two fishes in 21 litres tank with filter the waterfall ones. I clean their tank every once a month. They are so happy and always active. I have gotten the orange fish since last year October I think? And the gold one since start of this year because I had two but other fish died so I got the gold one :) how can I tell if there age and female or male?

Updated On July 27th, 2017

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

This question includes photos that may contain sensitive content. Click to view.

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If they are less than a year old, it is difficult to reliably determine sex. Males will be more streamlined than females and, during breeding season, will develop white "dots" (tubercles) on the gill covers. Their vents will also be smaller and more oval shaped. Females will have larger, deeper bodies (for carrying eggs) and their vents will be rounder and more pronounced.

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