I don't think it's right to mess with that kind of thing. They're already saying that man made bees could be the reason for the dramatic decline in natural bee colonies. If that's true, one of the first signs that maybe we shouldn't be messing around with genetic engineering could be disasterous on a global scale. No bees > no pollination > no new plant growth > no food > ...
Beside problems like that, I basically don't trust humans enough to think we should have these expanding engineering capabilities. Even if everything goes fine, what happens down the road when there's no limit to what we are capable of doing with genetics, and someone like Hitler comes along? A super race of engineered humans? Man made germs and diseases used to accomplish eugenics or genecide?
The fish are cool looking, but nature has already made thousands of fish that look cooler than those. Plus I'm sure there are better ways to detect pollution than engineering man made fish and releasing them. I'm sure there will be a few benefits along the way, but I don't think they outweigh all the negative possibilities.
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