> The whole genetics Vs Environment discussion is intriguing but are there
> reliable ways to find out which is the crucial influence in any one
> situation?
There is, but I am not sure what the experimental requirements are. You
typically have to compare different lines/crosses between related fish
(ie so that you are controlling the degree of genetic variation between
fish groups, by having some more related than others you know that some
are more genetically alike). Then you compare whatever trait it is that
you are looking at and do lots of stats and then come up with a
heritability value. Something like that anyway. :-)
> Getting back to the poor hatchability in captivity - can Rob Wager tell us
> if the DG's from Edgbaston ( C. squamigenus) have had a similar problem
> with ongoing hatchability in subsequent generations.
I found in our offspring raised from wild fish had a normal survival
rate. I wasn't able to get them to breed as I killed all of the 180 or
so of them by moving them from hard water to soft water. It took about
3-4 days before I awoke! Live and learn.
Tootles
Peter Unmack