Sharks come to spearfishers because of injured fish movement, not blood
When you're spearfishing, sharks are attracted less by blood and more by the vibration and movement of the injured fish. A speared fish signals weakness, and sharks are highly opportunistic, preferring to target what is already weak or dying rather than a perfectly healthy animal. Lauren Landers Sailing notes that sharks will reliably show up when you're spearfishing, and there are noticeably more of them in her current location than in the Bahamas.
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