RE: no SD bowfishers?
Howdy!
Welcome aboard.
The arrow's path is straight (well, as straight as any arrow's path is anyway).
It simply looks like it bends or changes direction when it passes through the surface of the water.
This effect is called refraction. It occurs when light travels between media of different densities (like air and water).
What ends up happening is that objects that are submerged like fish and rocks look closer to the surface than they actually are. Objects that pass through the surface of the water look bent.
All you reallly need to know about it is that you have to aim low when shooting fish, unless you're shooting at one that actually has a fin or his back out of the water.
You gonna come out with us in the spring?
Between the bunch of us, we've got a few extra bows and fish arrows.