LOL. What the hell are you guys talking about. You cannot use the concept of wild specimen generation and play along side by side with hybrids. In the world of hybridization, it is played throughout a family tree. Not in a concept of their captivity.
I'm going to set a quick and short example of understanding the concept of hybrids breeding in terms of generation usage.
ZZ x BP = F1
ZZ x F1 = F2
F2 x KML = F1(the reason is it is now out of its linage)
I agree f terminology can be used for the discription although it generally is not, but the x you are using as a referance means nothing if the fish doesn't display the exepted standart, set by the original breeder.
To become f0 it means you would have consistant results, fry will grow up to look like the standard. The line bred result of the x you mention. Crossing any of those fish stated above will give mixed result in fry making them hybrids again not the standard.
You must have f0 before you can have f1
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