ABOARD THE SUBMERSIBLE ANTIPODES: The invasive lionfish that crowds coral reefs and preys on native fish in the Atlantic’s shallower waters is such a problem that divers in Florida and the Caribbean are encouraged to capture and eat them whenever they can. Lionfish, which have venomous spines, are a well-documented problem in Atlantic coral reefs, where the foot (25 centimeter)-long, one pound (0.45 kilogram) invaders from the tropical parts of the Pacific and Indian oceans live without predators and eat other fish voraciously. What’s slowly coming into view is how deep into the ocean their invasion has spread. Researchers and wildlife officials worry that lionfish may undo...
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