The F debate...
The F system is actually used differently in the hobby than it was designed to use...
Here is an example:
In fish hobby, the number behind F stand for the furtherest generation away from the wild caught (WC) parent.
WC + WC = F1 - 1 generation away from the WC parents
WC + F1 (both related or non-related) = F2 - still 2 generations away.
F1 + F1 (both related or non-related) = F2 - still 2 generations away.
WC + F2 (both related or non-related) = F3 - 3 generations away from WC.
F1 + F2 (both related or non-related) = F3 - still 3 generations away from WC.
But the actual F# works this way:
non related parents will produce = F1
The F# will only increase if it is a related to the parent fish.
So, as you can tell, depends on if you are using a widely adapted aquatic hobby F system, or the actual F# system, you will have different F# down the road...
PS. but I do agree with Marius...
There is WC, F1, and F2, the rest are all tank-raised fish...