While only imported longline-caught swordfish is unsustainable, the fish should be avoided due to its high mercury levels and possibly nematodes or parasites, yet its high nutritious content justifies an occasional meal.
Mercury levels in marlin can exceed swordfish. Fisheries for many species are inadequately managed, and sea turtles, sharks, and seabirds may be bycatch.
Shark flesh is nutritionally worthless and has high mercury levels, thus many shark species are unfit for consumption. Sharks are vital to the food chain, hence declining populations are a concern.
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Tilefish, caught worldwide, may be the unhealthiest fish due to its high mercury content. Those levels are twofold in Gulf of Mexico tilefish. Some tilefish is caught unsustainablely.
King mackerel, commonly known as Spanish mackerel, is larger than its healthier counterparts and hence contains more mercury.
Start with knowing that this fish is called slimehead. Many orange roughy populations have plummeted, and newly found stocks are declining quickly, according to Greenpeace.
The owner of a Japanese sushi company spent $3.1 million for a 613-pound bluefin tuna earlier this year. It is one of the most threatened big marine species.
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