so now we're injecting thc into the fish to get it high ??
Hahha, that would be awesome. No, what I am saying is, there are probably other ways it can be absorbed by the fish.
I do know that some fish have different membranes that do absorb oxygen from the air, and most fish have a swim bladder that they hold air in.
But again, I don't really know for sure how it would work. Just speculating. But they inherent ability to get high., that is all I am trying to point out.