Tropical Fish Keeping - Aquarium fish care and resources

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lowco1 02-15-2009 02:47 AM

Ok quick question now.
This is the second time my mollies have had fry. The first time that it happened I was not prepared for it so most of them ended up dying unfortunatly I had five of them survive. Although now my mollie has had a second batch and I now have fourteen fry. I was just wondering though why are all of them female. I didnt get one male fry for some reason. Does anybody have any information for me about this?

Cody 02-15-2009 12:49 PM

I *think* it may have something to do with temperature, or I may be confusing fish with herps.

What is the temperature in the tank? That is most likely a complete guess, though.

jerrypunch 02-15-2009 01:39 PM

Many, many, many, many, many studies have been done to explain the phenomenon. Some have said water chemistry, others temperature, while even others have identified the amount of light. Sometimes I think that nobody really knows.


lowco1 02-15-2009 09:50 PM

I keep the tank at 77 degrease.

Cody 02-15-2009 11:24 PM

Oh, than my theory is out. I was thinking like if it was at 73/74F or so, then it would work.

But I have no idea now.

Oldman47 02-20-2009 08:32 PM

Most likely near equal numbers once the fry have had a chance to develop. The molly is one of many typical livebearers where all fry look like females for the first couple of months.

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