If your concern is about wildlife, you should nuke populated areas, the radioactive wasteland will become a de-facto wildlife preserve (as happened with Chernobyl). This won't help marine life, as they live in water which is amazing at blocking radiation. Also, the radiation emitted by a bomb is tiny when diluted across the entire ocean. I would be much more concerned about the other crap we dump into the ocean on an industrial scale.

>natural evolution cycles Evolution has dealt with things far worse than a few nuclear bombs.

>You might want to read on effects of ship noises on whales.

I am not suggesting that we bomb the ocean on a commercial scale.