This is true if you are trying to produce a nice aquarium strain. If you are trying to maintain a wild strain, I think it is a lot more complicated.
>
> I can say this in the knowledge that Peter Unmack is away for a couple more
> days yet... he'll tell us that it could be due to more factors than just
> genetic, and that a crappy specimen can sire (or dam) a good one, if the bad
> one is bad because it was raised in a toilet bowl.
This does not appear to be too controversial.
Cheers
Simon