I have never used sights on any bow I've used for fishing, even though I do use them for deer.

Fishingarrows are very heavy and very stiff compared to all other kinds.
I've seen several bows launch them at a 45 degree angle sideways before adjusting for the difference in spine.

For safety, use cabled arrows or safety slides from AMS to prevent snapback. Your kit may already have them installed on the arrows. The slides are little black collars that provide a place to attach the string, and they can slide up and down the arrow shaft. They let you keep the string in front of the bow at full draw so the line can't get snagged on the bow or bowstring.

Good Fishing!!!