I think it's more of the contrast than the color itself. If they're looking up and the sun is shining down everywhere and there's a big dark spot, it's going to get their attention. I think if you're down in the water with them, colors and patterns may come more into play.
As far as seals and stuff, I was thinking more of the people fishing inland in waterways connected to the Gulf. I know we get shark sightings from time-to-time in Prien Lake, Lake Charles, and the mouth of the Calcasieu River. I'm sure they love spots like the saltwater barrier that is stirring up lots of food and attracting fish. Plus, the water would probably be murkier (if that's possible around here lol), which is never a good thing.
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