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Top 10 Contaminated Fish You Shouldn’t be Eating

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Take a look at our list of the top 10 most contaminated fish on the market today. Avoid eating these or eat them in very small quantities, unless you are an expectant mother, in which case, avoid these fish entirely. However, we will list the best fish to eat at the end of this article, too, so keep reading!

1. Swordfish

This is another very large fish that eats other contaminated fish as their natural diet.

Although swordfish is hugely popular, this beautiful, tropical fish has been found to contain some of the highest levels of mercury among all larger sized edible fish. These fish contain high levels of a very strong neurotoxin called methyl mercury. This toxin can easily cross the placenta in pregnant women, and has the potential to damage the nervous system of the unborn fetus.

Recent studies have shown that excessively high blood levels of mercury can be traced to high or frequent consumption of swordfish. One study was performed in San Francisco and involved 123 subjects who eat 30 different types of fish. Those with frequent consumption of swordfish had the highest blood mercury levels that were over and above the maximum amount recommended by the National Academy of Sciences as well as the United States Environmental Protections Agency.

2. Shark

This means any type of meat eating shark such as Longfin Mako, Shortfin Mako, Blacktip, or common Thresher shark. Because sharks are at or near the top of the food chain, they consume other types of fish as their main source of food. This means whatever mercury and contaminates are in the fish they eat accumulate in the bodies of sharks.

It’s ironic that many people eat shark products such as soups, health drinks, pill supplements, and even shark steaks, believing that shark is a healthy meat. In fact, this terrible misconception is so prevalent that one of the world’s largest insurance companies added shark steaks, while at the famous Taste of Chicago food fest, as one of their recommendations as a “healthy” food.  In fact, if you read the numerous studies available on this subject, there is absolutely no scientific evidence that eating shark, or taking supplements in any way.

3. Spanish Mackerel

This is another mackerel that’s contaminated, and like the King Mackerel, it’s due to its large size. The Atlantic Spanish Mackerel is another migratory fish that goes to the Northern Gulf of Mexico in springtime and returns to south Florida, then the Western Gulf of Mexico in the fall. Even with this migratory pattern, they can be found from the Yucatan of Mexico all the way to the Cape Cod of Massachusetts.

Spanish Mackerel are actually related to tuna.  They can grow to three feet in length and because they live more closely to the shores, they can easily become contaminated by mercury that is being released into the ocean via slow moving coastal rivers.

4. King Mackerel

This voracious predator is definitely on the no-no list. Even though the Florida Department of Health Secretary Robert G. Brooks believes that it’s “virtually impossible” to get enough mercury from this fish because they are caught far out in the ocean, he’s wrong. Mercury builds up in the body. The findings are consistent and King Mackerel contain high levels of mercury.

Researchers suspect that mercury, which comes mainly from industrial sources such as waste incinerators, the manufacturing of chlorine, and coal plants, is being spread through the air and eventually ends up in the water.

The longer the lifespan of the fish, as well as the larger it grows, the more mercury that fish will accumulate in their lifetime. King Mackerel have a migratory path that runs from South Florida to North Carolina.

King Mackerel, sometimes called Kingfish, are a common part of sport fishing. Although some authorities feel that it’s safe to eat this fish if it’s less than 33 inches long and weighs 10 pounds or less.

5. Orange Roughy

Orange roughy, which are part of the slimehead family (sounds tasty, right?) can take as long as 40 years to reach full maturity. Amazingly, these fish can live as long as 150 years! This means that, besides being easily overfished, they have many years to accumulate mercury and other toxins into their flesh. Orange roughy live in the deep waters off the Western Pacific Ocean, Eastern Atlantic ocean, South Africa, New Zealand, Australia, and the Eastern Pacific off Chile. Although they are actually a deep brick-red color, their flesh fades to a yellow orange after death, hence their name.

Because of their very long lifespan, orange roughly can accumulate huge amount of mercury within its flesh. Regular consumption of orange roughy can have seriously adverse effects on your health. On top of that, compared to other fish, orange roughy is not a good source of omega-3 fatty acids, so you would be wise to choose another type of fish. Make safer choices from the “safer” list at the end of this article.

6. Pacific Ocean Perch

Mercury does more than accumulate in fish; it also accumulates in the human body. This bioaccumulation in seafood carries over to human beings, where it can result in mercury poisoning. In human controlled studies of the ecosystems of fish, which are generally done for market production of a wanted species of seafood, results clearly show that mercury rises through the food chain from the fish that consume plankton, which are eaten by larger fish, which are consumed by even larger fish. Each succession of fish absorbs the mercury that came from each fish that was consumed by the previous fish.

Pacific Ocean perch is commonly served in many restaurants as well as being caught by sports fishermen.

7. Chilean Sea Bass

As if it’s not bad enough that this fish is contaminated with higher levels of mercury than the United States, and most other countries, feel is dangerously unsafe, they have also been hunted to the brink of extinction. If you see Chilean Sea Bass listed for sale, it’s either a different type of fish with an erroneous label, or it has been caught illegally. In fact, Greenpeace states that, unless fishing practices change, and people stop eating this fish, Chilean Sea Bass could become extinct within five years’ time.

By the way, there technically is no Chilean Sea Bass. This is a marketing makeover name because many people, especially Americans, find its true name a bit distasteful. Chilean Sea Bass are actually called Patagonian Toothfish.

8. American Eel

American Eel is sometimes referred to as silver eel or even yellow eel. This fish, which is most commonly found in sushi restaurants, found its way here due to high levels of contamination from both mercury and PCB’s. Unfortunately, this tasty fish is also suffering from more than just pollution, but overfishing as well. If you love the taste of eel, avoid the poisons and contamination and choose either Atlantic caught squid, or even Pacific caught squid, as both taste almost exactly the same, but are plentiful and have low contamination levels. Mercury can impair the nervous system and brain development, especially in infants, young children, and developing fetuses.

Although the 2011 Food Safety Modernization Act was supposed to help the FDA better monitor fish farms and imported fish to be sure that they meet certain standards, lack of funding means this may or may not happen, so you will need to do some research on your own and avoid dangerously contaminated, overharvested fish such as American Eel.

9. Atlantic Flatfish

Atlantic flatfish include such fish as sole, halibut, and flounder that are caught off the Atlantic coast of the US. These, like many of the fish from the Atlantic Ocean, are heavily contaminated due to industrial waste as well as being overfished. In fact, these fish populations are as low as 1 percent of what is thought to be necessary for sustainable, long term fishing, according to the Food and Water Watch. Consider eating other fish that have the same mild flavor and white flesh, such as tilapia or Pacific halibut.

Although you might consider eating imported fish (more than 85 percent of fish consumed in America is imported) many other countries do not have the same standards for fish as the US does, which means imported fish can have banned antibiotics and pesticides such as DDT in the meat. The FDA cannot possibly test every single fish that comes into the country, so only a very small fraction is ever tested.

10. Blue Fish

This is another fish that is tricky. It is a great low fat, protein rich source of those omega-3 fatty acids, but it can be full of dangerous toxins including PCBs, pesticides, and, of course, mercury. Blue fish can become contaminated from storm run-off, agricultural chemicals, and industrial discharges, but they can also be contaminated when they eat natural toxins of some varieties of bacteria, and algae.

Mercury is a natural element in nature that never, ever, breaks down or decomposes. It’s a pollutant that often comes from industrial factories. Mercury binds to the protein in fish, so it’s found in every part that humans consume. Fish that are caught in watersheds with mercury warnings should be removed, and predators, because they eat smaller fish, tend to have higher levels of mercury and other types of contamination than smaller fish, such as sardines.

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