As far as the "dominion over all animals bit" - I'm going to try and avoid that third rail, but I figure if God wanted me to have dominion over groupers and sharks as a hunter I would not have been designed as a thin-skinned, small-jawed, blunt-toothed, finless, air-breathing biped with poor underwater senses.
I just see it as we have to enter their domain using a whole lot of clumsy gear that's somewhat effective for only a short period of time. That makes me the interloper who ought to be thankful for what he can get from the ocean using his equipment and skills - not the one who owns the place and everything in it. I don't have an absolute moral objection to the idea of spearing goliaths and sharks; I just would rather the reason be something more than "they get in my way."