Shark

Predatory cartilaginous fish. They are too rare and slow-reproducing to be a sustainable food source. Many sharks are killed just for their fins, which are cut off with the shark thrown overboard to die.

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Sources:

• Monterey Bay Aquarium
• Marine Conservation Society
• Greenpeace
• FDA Mercury Table

The Monterey Bay Aquarium rates some sharks as "Good Alternative", but the MCS rates all sharks as 5, and they are are on the Greenpeace red list.