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Platy Fry Sexual Maturity | Home Fish Aquarium Guide

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Platy Fry Sexual Maturity


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Well…. I’ve already updated this on the platy fry post, but…. in looking at our oldest tank of fry. They’re now almost 2 months old. (Born 2-19-11) They’re still quite small fish and all look female at this point. There is an adult male in with them and today I noticed that they must be looking good to him because he’s starting to behave a little different around them, sidling up next to them much the way I saw Mickey court a couple fish….

So, as I’m reading it looks as though most people say that platies reach sexual maturity at around 3-4 months. I’ve seen one account suggesting as young as 2 months. I’m not sure how precise these counts are. We may get to pin down an exact threshold though because I’ve seen 23-25 day gestation periods with the mother platy at this point. What to do….


They all still look to be female at this point and are still quite small, but they could be mothers soon I suppose. My plan was to migrate them all outside to outdoor barrels/water containers etc. I’m not sure if the weather will be warm enough soon enough for me to do that before they are all pregnant.

I may go ahead and move the larger adult male out of the tank and back to the 10 gallon now that it’s settled down some. That might buy us a bit more time (if it’s not already too late….)

I’ll update here when needed.

4-24-11 – update

Well – at around 63 days of age for our first batch of fry I was able to distinguish a couple males out of the group. So…. I would guess that they are sexually mature at this point. I understand that there could be a “late bloomer” still amongst the 3 females in that batch.

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April 14, 2011 - 7:55 PM
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