Most predators can actually see bright colors very well, but do not use color to determine prey items. Behavior that mimics injured or sick prey items is far more attractive to them as far as invoking the hunt instict. Shiny objects may attract fish like baracuda, but once they see they're out-sized, they become docile. As a matter of fact, bubbles from open circuit SCUBA units can actually spook alot of species that would fall into this category. I have worn bright yellow for years as an instructor so that students and groups can recognize me. In over a decade of diving with these colors, I have never noticed any different behavior from any of the animals I have encountered.