When in the water you should NOT wear anything shiny like a watch, or necklace, or ring. Barracuda are attracted to shiny objects but usually won't bother you if you are not reflecting light off a piece of jewelry.
Barracuda have razor sharp teeth and are ferocious. I have one hanging on my wall I had mounted years ago and I can tell you I will no longer even pull one into my boat if I hook one. Now I just cut the line and let him go.