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About the parasites...
I was actually watching a shark doc yesterday on the very subject. I forget the species, but the shark was not known for those waters. From footage filmed, they realized the sharks were coming to the reef from open ocean to be cleaned of parasites. the shark would slowly swim by the reef, then turn over on its side slightly. Butterfly fish would come out and clean the sharks skin. If he didnt want to be cleaned he swam by faster, no cleaning fish............
I was actually watching a shark doc yesterday on the very subject. I forget the species, but the shark was not known for those waters. From footage filmed, they realized the sharks were coming to the reef from open ocean to be cleaned of parasites. the shark would slowly swim by the reef, then turn over on its side slightly. Butterfly fish would come out and clean the sharks skin. If he didnt want to be cleaned he swam by faster, no cleaning fish............