RE: Bowfishing with a crossbow???
look at your hand grip where you hold your bow up when shooting and looking on the outside of that and down and that should be your stabelizer hole- the 100 test power pro should work but the only thing id be worried about is youd beter be in a boat or the beaver will tear all your line out and your going to have to have something to kill it with when you get it up because you don't want a beaver latching on to your arm......beavers are some tough animals your gunna need something like a 22. or a club to the head to kill them