Tilefish and king mackerel are two such fish, and both were sold to consumers who believed they were procuring red snapper and halibut respectively.
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Larger fish such as shark, king mackerel, swordfish, and tilefish tend to be highest in mercury because they eat smaller fish and consume the mercury in them as well.
Few foods contain it naturally -- mainly fatty fish like salmon, mackerel and tuna, as well as liver and egg yolks.
Some fish, such as salmon and mackerel, are a good natural source of omega-3s.
The International Council for the Exploration of the Sea (ICES), an intergovernmental advisory and research organization, recommends a total number of mackerel allowed to be caught in order for fish stocks to remain sustainable.
Other good fish sources of omega 3 fatty acids include mackerel, lake trout, herring, sardines and albacore tuna.
Mr. Fitzgerald, of the Environmental Defense Fund, suggests a few ways to navigate all these issues: Eat more small fish, and a wider variety of them, including mackerel, oysters, or sardines.
"I'm getting tired of catching no fish, " said Robert Strazi, a 23-year-old mackerel enthusiast, as he cast his line in vain off Pensacola Beach's 1, 471-foot fishing pier, flanked by just two other anglers.
Darker-fleshed fish that swim in cold, open waters, such as tuna, herring, and mackerel, store fat in their flesh and are high in omega-3s.
Also on the list: the abundant Chilean jack mackerel in the southern Pacific Ocean, for human consumption in Africa, and Antarctic krill, for fish oil and fishmeal.
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