Tim Roberts said he had noticed a big increase in the number of sharks and other dangerous sea life, including stingrays, because of the fish tails and guts that wash out to sea after fishermen gut them on shore.
Mr Roberts, 61, was diving 100m offshore on Wednesday when what he believes was a shark punctured his left foot four times through his fin.
"I swam like crazy after I felt that," he said. "I was waiting for the inevitable big bite, but it never happened."
Tim Roberts' bandaged foot - the wound bled profusely after the bites.
"That was the worst part, that feeling like your legs are going like jelly," he said.
Mr Roberts believes the shark punctured a small artery because he bled profusely and left a trail of blood.
When he got to the shore he bound his foot with duct tape, then rode his motorcycle home where he applied a bandage.
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