hhhhh?
You mean because he's underwater, he's a Zoan, and he shouldn't be able to breath?
Well his body doesn't look like a fishman's body, but it could be...
Though I don't think he's a fishman, must be something different entirely
its hard to confirm... we've never seen his full body :/
he might be a crossbreed of a fishman he was referred as a being
Even if he were a fishman he still wouldn't be able to breathe underwater as proven in the case of Vander decken IX in fishman island arc. He used to coat a bubble around him for the very reason and even stated so. But, as to why jack is still alive underwater it still is a mystery. Maybe b'cuz the beast pirates are known to have a great durability as seen with both jack and kaidou. But I think there is still a mystery behind it which only the coming chapters will tell.
vander only used the bubble because he couldn't swim not because he couldn't breath and if jack wasn't half fishman then how can you explain him not drowning underwater he is a half breed of fishman half unknown race because he was referred as a being
it's unknown for now
I'm still trying to figure out why you spammed 5 h's with a question mark.
I think he is a fishman. Look at his teeth and look at Dellinger's. It's the same. Again, this is me assuming