RE: Poundage ?
If you get into a decent amount of fish, you'll get tired of pulling that much weight in a hurry. A good bowfishing outing can result in one hundred or moreshots.
Also, more draw weight can impede your ability to 'snap shoot' at fish that appear by surprise just a few feet away. They won' be there long, and you'll have to draw and release very quickly to have a chance at them.
Many competitive tournament shooters in my area use bows that are in the 30-40 pound range, sometimes lower if they are shooting in water that has submerged stumps or is shallow and rocky.
I blow through soft carp and buffalo about half the time with a 50# recurve when shooting at short range and have to short draw to avoid it. I'm considering getting lighter limbs for that bow so it isn't a concern.
You really only need a heavy draw if youregularly encounterreally big fish that are down deep. In that situation, you won't need to shoot quite as fast anyway, and the deeper penetration will be necessary.