I really can't improve on the points that Lora has made (thanks Lora, I was looking to write a similar post but wanted to dive into some of my books first to check my facts), and Shannon makes some very good points as well.

I also agree with Mike about mapping the tetras and other sirtalis genomes, I'd probably go a step further and suggest that mapping the genome and engineering out defective genes would provide a more robust European tetra. That opens up the whole genetic modification debate. I don't have any moral or scientific issues with engineering to repair defective genes, but I will attempt to close off lengthy debate about it by saying that it will never happen because genome mapping and genetic manipulation is expensive and time-consuming, and nobody that would pay for it gives a rats sphincter about San Francisco garters.

I don't think there's much more I can contribute on this topic without circling back on ground we've covered.