Yes I do know warmblooded birds are different and more adaptable then a cold blooded fish, it would be hard.
But I don't think its an impossibility, it would just take a long time for them to adapt. it would have to be a slight lowering in temp (very slight) over multiple generations. Genetic Engineering is flying in terms of progress lately, that could be another avenue to create a northern gator gar. Cambrian Genomics has managed to 3D print DNA, the whole mammoth (or mastodon don't remember which) breeding project is projected to be done by 2018 I believe.
who knows what fish we will be able to get in the near future w/ all these things being done. that's why we have blood red parrots, GloFish etc. Living proof you can do wonders through such avenues. although I hate animal testing such as that, if its to solve a problem (like the asian carp) then I'm behind it 100%. if its to make a fish pretty, therefore making it easily susceptible to disease and such like glofish varieties then I don't see a point.
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