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Sounds exactly like an algal bloom, I have been noticing this in Chics beach the past few weeks:...
Just saw that someone drowned at Croatan yesterday... http://hamptonroads.com/2011/08/surfer-drowns-croatan-beach-late-thursday Stay safe out...
Calf cramps suck. I used to get them almost every time I went out (sponge) and they were painful and potentially dangerous since you're losing...
Looks like a spiny boxfish (burrfish): http://en.wikipedia.org/wiki/Striped_burrfish They have a hard "shell" unlike your normal puffer fish...