The sharks feed on the birds who can't stay aloft. Many fish in the NWHI have been tested for ciguatera poisoning and some of the top predator fish are considered to be toxic. Ciguatera poisoning occurs when fish feed on certain types of algae that live in coral reef systems. As smaller fish are eaten by larger ones, the toxins gradually become concentrated in the muscles of the fishes at the top of the food chain. All rights reserved .
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