RE: What bow length?
The nice thing about bowfishing is any old bow will work, and the older the better. You wouldn't want your good hunting bow covered in blood and slime. 55# compound will work, but might be too much - you don't want the wholearrow to go all the way through the fish. You also want a longer ATA length to avoid finger pinch. I personally prefer and use some cheapy recurves I got off eBay. I had started with an old compound, but it weighed a ton. There are also bows made specifically for bowfishing, but I found it easier to spend $20 on a bow instead of $200, and it shoots fish just as well.