probability of sexing severum fries.

[terror]

I'm planning to get some 1 inch rotkiels 4 pcs all in all ,
whats the probability of getting 2 females and 2 males if i'm to choose
the 2 largest and 2 smallest from the group which are siblings?

:)

[liv2padl]

at two inches, the chances of getting 2 of each sex based simply on the size of the fish are the equivalent of flipping a coin and getting heads or tails. i'd say 50:50 size does not become a factor until the fish have reached sexual maturity.