I remember someone in Germany crossbred Those: L46xL236. L46XL174.

1 looks like a possible female and rest of them look like males.

Your fries look only 1 to 2 months old. You obviously have done a great job keeping them alive. But try to go for a bigger size next time if you buy more. It's really hard for the fries under 6 months old to survive in the trip. my 2 cents.

I noticed that two of your fish are snubnoses. Those two are shorter than the size they suppose to be. So those two fish are older than what you think.

here is the sale auction I found at aquabid.com for a group of 20 fully matured adults fish between 3 to 4 inch and 5 years old. But I see some jeveniles which are probablly under 2.5 inch besides those fries. is it just me having a wrong appreciation? http://www.aquabid.com/cgi-bin/auction/auction....

I can see it. It's not on the tip of the fin, but on the very top of the fin. It does looks very stressed.

Young male.

It happens often for plecos. How many females are there? If you have multiples, there might be a chance that a different female is ready to lay eggs and trying to find her way into the cave while your male is fanning eggs.

they are too young to even make a wild guess.

1, 2 and 6 are females.

I don't know about other fish. But the fish from the picture don't look like it's over 3 inch.

how big is it? If it's 2.75 inch or larger, then she is a female.

They don't look like so. zebra pleco fries are half transparent and have a big yolk sack attached.

how much are they? they look beautiful.

Yes. It's very possible.