Have you tried punching it?
I don't think I've seen him try to full-force punch anything so far. He'd likely make a crater in a sheer rock face so whatever that dino's made out of is fairly certain to get dented pretty significantly
...how the fuck do you get artificial respiration from a fish? They don't have lungs or even air they can expel anywhere in their body, they filter oxygen out of the water through their gills (and the air bladder is a closed system, they can't just purge it into their mouths or whatever)