(Shark fin soup being served at a formal gathering.Paul Sakuma/AP)
Shark fin soup is a traditional Chinese dish that has become popular across the globe. It is viewed as a delicacy, so many restaurants are able to charge top dollar for the seafood broth.
With declining populations of sharks worldwide, there have been multiple bans on the sale of shark fins in the United States. However, some species are still allowed to be sold. It is also almost impossible to stop the sale of shark fins, Sea Shepherd says, because many Asian markets often lie about the species they have caught and laws aren’t always upheld.
This so-called delicacy also leads to some major health problems.
The reason indulging in this dish can be so harmful is because of bioaccumulation, explains the Shark Research Institute. Toxins concentrate in animals when they move up the food chain. Since sharks are some of the largest and longest-living species in the ocean, they have a high position on the food chain, so they consume huge amounts of toxins that have accumulated in their prey.
A study published in Science of the Total Environment in 2014 measured levels of monomethylmercury (MMHg), the most toxic and volatile form of mercury, in 50 dried unprocessed fins of 13 species found in international trade, as well as 50 samples of shark fin soup prepared in restaurants across the United States. They found that concentrations of MMHg in fins ranged from 9 to 1720 ng/g and concentrations in fin soup were 0.01 to 34 ng/mL. The highest values came from sharks at the top of the food chain, like hammerheads. The consumption of a 240 mL bowl of shark fin soup containing high MMHg concentrations is 17% more than the EPA’s recommended amount.
This is a major problem for expecting mothers. A 2015 study published by researchers at Rutgers University measured mercury levels in different fish species in New Jersey. They found that most mako sharks, a fast-swimming large mackerel shark, has mercury levels exceeding 1.0 ppm, with the highest being 1.8 ppm.
Less than 2 parts in a million may seem trivial, but the US Environmental Protection Agency has set the limit at 0.3 ppm and the US Food and Drug Administration set their own level at 1.0 ppm. The US FDA has said that pregnant women should avoiding eating shark meat because prenatal doses can lead to behavioral deficits in infants and lower results on cognitive performance tests.
(Students from the University of Miami participate in a shark tagging expedition for scientific research.Lynne Sladky/AP)
More symptoms of mercury poisoning can include harm to the brain, heart, kidneys, and immune system.