In one of the articles they thought color was a factor because they cut off the red tab on a RES and were able to consummate the deal with a cross they were not able to before.

But there is more to it than that. Some crosses they made in the lab created fish that were deformed or did not live past yolk sac stage. So it is a complicated deal.

I only know what I have read and I forget a good share of what I read. So I just pick up bits and pieces as I go along. Read the articles I linked to and you will know more than me, which still may not be a lot. Some of it is pretty interesting, some of it is just dry and tedious research.

John

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