Thyroid disease in cats is an epidemic and seems to affect males even more than females. The sinking carcasses of fish from near-surface waters deliver toxic mercury pollution to the most remote and inaccessible parts of the world's oceans, including the deepest spot of them all: the 36,000-foot-deep Mariana Trench in the northwest Pacific. ; Krabbenhoft, D.P. Proper disposal of mercury containing items such as medicinal packaging and thermometers, using mercury-free bulbs and batteries, buying consumer products with zero or minimum mercury emission to the environment can make a significant difference in recovering world’s ecosystems from mercury pollution leaving minimum legacy of mercury pollution in the ocean for our future generations. https://www.disabled-world.com/calculators-charts/fish-mercury.php Nutrition experts often recommend seafood for kids and pregnant mothers since it is a rich source of vitamins, minerals, omega 3 fatty acids, and proteins. Catfish mercury levels are low. Due to this natural cycle, irrespective of which part of the world releases mercury it could affect an entirely different part of the world making mercury pollution a global concern. If you’re concerned about ingesting mercury from fish, choose fish lowest in mercury — especially if you’re pregnant or nursing. Mercury passes into tiny plants and animals that live in water, and into the fish and shellfish that eat them. ; Sunderland, E.M. Mercury biogeochemical cycling in the ocean and policy implications. Stud. About the mercury-level categories: The categories on the list (highest mercury to lowest mercury) are determined according to the following mercury levels in the flesh of tested fish. The table is sorted by MERCURY CONCENTRATION MEAN (PPM) from fish with lowest levels of mercury to highest levels of mercury. Pollock is a North Pacific marine fish that can grow up to 3.44 feet. The 2002 Global Mercury Assessment concluded that "International actions to address the global mercury problem should not be delayed”. Other seafood ranked in this category include: Salmon is favorite because of its rich nutritional profile. Eating contaminated fish is the number one cause of mercury exposure in America. High mercury: From 0.26 to 0.55 parts per million. It used to be that eating seafood and fish regularly was a pretty safe nutritional bet. Suggested Fish Serving Frequency The FDA advises that women at high risk can eat two to three servings a week of seafood with low mercury levels and one serving per week of fish with mid-range levels. Mercury levels in the atmosphere, oceans, streams, lakes, and rivers have been rising as a result of emissions from coal-fired industrial plants, which are still the world’s major source of power. Natural processes are mainly geogenic such as volcanic activities and land emissions through soil. 4 … Lamborg, C.H. [11] These sources also release organic mercury compounds such as Methyl mercury. http://www.unep.org/gc/gc22/Document/UNEP-GC22-INF3.pdf, http://www.livescience.com/47222-deep-ocean-traps-mercury-pollution.html, "Mercury contamination in surface sediments and sediment cores of the Mersey Estuary, UK", "Rise and fall of mercury (Hg) pollution in sediment cores of the Thames Estuary, London, UK", "Status of organic pollutants in surface sediments of Barnegat Bay-Little Egg Harbor Estuary, New Jersey, USA", "Organic and metal contamination in surface mangrove sediments of South China", http://webnesday.com/this-fake-coral-sucks-up-mercury-pollution-for-a-cleaner-ocean/, https://theconversation.com/we-created-a-new-material-from-orange-peel-that-can-clean-up-mercury-pollution-49355, https://en.wikipedia.org/w/index.php?title=Mercury_pollution_in_the_ocean&oldid=974504396, Creative Commons Attribution-ShareAlike License, This page was last edited on 23 August 2020, at 12:35. Oxidation and reduction of mercury in the ocean are not very simple reversible reactions. ; Heimburger, L.E. This mercury exposure is known to cause a number of health problems, including neurological damage and organ damage. Due to this natural cycle, irrespective of which part of the world releases mercury it could affect an entirely different part of the world making mercury pollution a global concern. Halibut mercury level is classified as fish with mid-range mercury levels. [19] Infants and developing children face even more serious health risks because mercury exposure inhibits proper brain and nervous system development, damaging memory, cognitive thinking, language abilities, attention, and fine motor skills. Technol., 2010, 44 (2), 644 – 649, 13. Hake are deep-sea fish, majorly found in the North East Atlantic, and Pacific Oceans waters. Top 15 Low and High Mercury Fish: Safe for Kids and Pregnant Women. [7][8], Mercury release occurs by both natural and anthropogenic processes. You may unsubscribe via the link found at the bottom of every email. They have protruding mouths with swollen lips and a long dorsal fin. The same serving size of sockeye salmon contains 133 calories, 4.7 grams of … There has been an increased concern about mercury in seafood over the last decade which has caused unwarranted alarm about all seafood and general confusion about what is safe to eat. It is one of the seafood delicacies in Europe due to its medium flake delicious white meat. That pollution can travel halfway around the world and then settle into lakes, rivers, and oceans, where it is absorbed or ingested by small organisms and then starts working its way up the food chain, its concentration rising with each step. Resour. They are distinguished by their fins without spines. Mercury can be released directly into water through wastewater and industrial discharges. Environ. This mercury can also concentrate up the food chain. Therefore, finding possible solutions to minimize further mercury emissions and cleaning up the already existing mercury pollution is extremely important. If you regularly eat salmon, you are probably well aware of the potential health effects of mercury. Some of the nutrients found in salmon include selenium, biotin, vitamins, omega 3 fatty acids, and proteins. Has low levels of mercury (below 216 parts per billion [ppb]) Provides at least 250 milligrams per day of omega-3; Is classified as a Seafood Watch “Best Choice” for sustainability; The “Super Green List”: July 2013. Oysters are soft water molluscs which thrive in salty marine water. Fish can accumulate mercury in their muscles through absorption from the surrounding water but mostly from the prey that they eat. [9] While natural phenomena account for a certain percentage of present-day emissions, anthropogenic emissions alone have increased mercury concentration in the environment by threefold. For more on the effects of mercury in fish on adults, check out Fish Fog. Mercury has been found in the deepest part of the Earth’s oceans, the 11,000-metre-deep Mariana Trench in the northwest Pacific. [21], In addition to human health, animal health is also seriously threatened by mercury pollution in the ocean. Most of these fish low in mercury species live on the sea floor, and their flesh is white. [10] Global Mercury Assessment 2013 states main anthropogenic sources of mercury emission are artisanal and small - scale gold mining, fossil fuel burning and primary production of non-ferrous metals. These fish are rich in omega 3 fats, calcium, protein, iron, and zinc. Once they are in the ocean they can undergo many reactions primarily grouped as; redox reactions (gain or loss of electrons), adsorption processes (binding to solid particles), methylation and demethylation (addition or removal of a methyl group). [22][23] The reactions involved in synthesizing this material are; Another novel material (Patent application: PCT/US15/55205) is still under investigation which looks at the possibility of cleaning mercury pollution using orange peels as raw material. Start studying Oceanography chapter 11. ; O’Driscoll, N.J.; MacLeod, M.; Neuhold,Y.M. ; Rijkenberg, M.J.A; Saito, M.A. Plumes of smoke carry mercury, a neuro-degenerative toxin (3), into the atmosphere, where it insidiously filters into all of our water supplies and even our organic foods. Worryingly, marine monitoring indicates that ocean levels of mercury are on the rise. The organic form of mercury, particularly methylmercury, is the most dangerous. Mercury is the only metal that is a liquid at standard temperature and pressure. The Problems of a Global Food Supply. Ideally, all seafood contains mercury. ; Lamborg, C.H. Public awareness is critical in achieving this goal. ; Heinz, G.H. Nevertheless, there is some promising ongoing research bringing hope to the challenging task. Before shopping for seafood, familiarize yourself with the levels of mercury in fish. About five trillion pieces of plastics can be found floating in the sea most of which are found in garbage patches such as the Great Pacific Garbage Patch . In high quantities, methylmercury can be toxic to the nervous system. Sardines are found in warm water on the coasts of India, Indonesia, California, and Japan. Just as mercury builds up in fish tissues over time, it can also accumulate in your body. Land emissions are usually observed in the regions closer to plate tectonic boundaries where soils are enriched with minerals such as cinnabar containing Mercury sulfide(HgS). [11] To keep mercury toxicity at bay, limit your seafood consumption to 2 – 3 servings per week, which equates to about 8 – 12 ounces. In addition, mercury enters the ocean via rivers, estuaries, sediments, and, hydrothermal vents etc. ; Hammerschmidt, C.R. For parts one and two, see Nerves of Mercury and Hair Testing for Mercury Before Considering Pregnancy. Catfish is a group of fish with prominent whisker-like barbels. 2009, 34, 43 – 63, United Nations Environment Programme (UNEP), Global Mercury Assessment: Sources, Emissions, Releases and Environmental Transport (Geneva,2013), Mason, R.P. The historical use of mercury has set the stage for many of the modern products and processes that utilize mercury. Atlantic Mackerel (purse seine from Canada and the U.S.) Freshwater Coho Salmon (farmed in tank systems, from the U.S.) Mercury can find its way into food in a number of ways including: natural recycling, volcanic activity, burning of fossil fuels, and pollution. It was once thought that plastic could only be found along the coastline but it has been found in the Mariana Trench which is the deepest point in the ocean. In nature, it has been long observed corals can absorb heavy metal ions due to its surface structure and this new technique has used to nanotechnology to create “synthetic corals” which may help clean mercury in the ocean. Despite being a rich source of nutrients, studies show that some types of seafood contain mercury, a substance that can impair the development of fetus’ nervous system. ; Hungerbuhler,K. Mercury in tuna is a health concern because of the risks associated with mercury exposure. Like most fish herrings are rich sources of Omega- 3 fatty acids, calcium, vitamin D, Vitamin B6, Zinc, iron, and Vitamin B-12. There is no better way to get the taste of the ocean than by, CLICK HERE TO BUY SAFE TO EAT FISH AND GET 15% OFF AT CHECK OUT. and how you might be missing out if you've never heard of this type of fish before. Mullet is rich in Vitamin A, Vitamin B-9, sodium, Vitamin B-3, protein, calcium, magnesium, phosphorus, and selenium. [5][6] According to statistics, about 66% of the global fish consumption comes from ocean. Lower mercury: From 0.12 to 0.25 parts per million [16] Shown below is the proposed pathway of ocean aerosol mercuric photochemistry suggesting that it occurs through a reactive intermediate: Photo oxidation is suspected to be driven by OH. Low-mercury fish are excellent choices for children as well. Seafood prepared from white fish is rich in proteins, fats, sodium, potassium, vitamins, selenium, magnesium, and calcium. Some of the common types of fish classified under the catfish category are: • Piraiba found in South America • Mekong giant catfish found in Southeast Asia• Wels catfish found in EurasiaThis seafood is rich in proteins, vitamin B-12, phosphorus, selenium, omega 3 fatty acids, magnesium, iron, zinc, and fat. Mercury within the northern Pacific Ocean has increased by almost 30% during the previous two decades. Although both oceans have gyrases, human activities are limited. Photoreactions of mercury in surface ocean water: Gross reaction kinetics and possible pathways. Mercuryis a toxic heavy metal which cycles through the atmosphere, water and soil in various forms to different parts of the world. / J. Colloid Interface Sci., 2015, 453, pp 244-251, United States Environmental Protection Agency. ; Hammerschmidt, C.R. Mid-Atlantic tilefish has lower mercury levels and is considered safe to eat in moderation. This technology produces sulfur limonene polysulphide (proposed material) using sulfur and limonene. Mercury has been linked to kidney damage in human medicine, ranging from increased protein in the urine to kidney failure. Highest mercury: More than .55 parts per million. Dead fish, full of a lifetime of mercury, may function as a vessel of this toxin to the deep ocean. Annu. This is the last of a three-part video series on the latest on the risks of mercury in fish. 2012, 119, 64 -87 Dimethyl mercury degradation also produces some of the methyl mercury present ocean. Nutrition experts often recommend seafood for kids and pregnant mothers since it is a rich source of vitamins, minerals, omega 3 fatty acids, and proteins. Mercury is common in the environment and has three forms: organic, inorganic and metallic. In appearance, the fish looks greenish black with a silvery latex line. Rev. 2006, 36 (8), 609, Selin, N.E. Therefore, it is important to monitor and regulate oceanic mercury levels to prevent more and more mercury reaching human population through seafood consumption. [13] In contrast sediments entering the ocean from the marsh creeks of East Coast USA and mangroves fringing the South China Sea generally have moderate sedimentary Hg (<0.5 mg/kg).[14][15]. Mercury in the air and soil makes its way into rivers, lakes, and the ocean through rain and snow runoff. That’s because it’s a great source of protein, micronutrients, and healthy fats. (2014). The sinking carcasses of fish from near-surface waters deliver toxic mercury pollution to the most remote and inaccessible parts of the world’s oceans, including the deepest spot of them all: the 36,000-foot-deep Mariana Trench in the northwest Pacific. Under UV radiation, elemental mercury oxidizes and dissolves directly in ocean water or binds to other particles. However, most of the methyl mercury found in the ocean is produced in –situ (inside the ocean itself). And most of that mercury began its long jou Researchers estimate that the Pacific Ocean contains at least 46 _____ pounds of floating microplastic pieces (microbeads) that originate from hand cleaners, exfoliating facial scrubs, and toothpaste, that are known to transport pollutants and be eaten by fish. Atmospheric deposition is the largest source of mercury to the oceans. Some methyl mercury is released to the ocean through river run-off. ; Fitzgerald, W.F. … Anchovies have a slender body, a blunt snout, and they are green in color with silver and blue reflections. [18] Produced methyl mercury gets accumulated in microbes. [10], Mercury enters the ocean in different ways. Depending on the location and species trout can have different colorations and patterns. Res. Low-mercury fish are excellent choices for children as well. Mercury has a very high surface tension, so it forms rounded beads of liquid. Reduction and oxidation of mercury mostly occur closer to the ocean water surface. [13] A gradual and statistically significant decrease in sedimentary Hg content occurs in the Thames as a results of greater distance from the historical and current point-sources, sorption and in-river deposition in the mud reaches as well as dilution by marine sands from the Southern North Sea. Some of the nutrients provided by tilapia seafood include low-calorie proteins, omega 3 fatty acids, vitamin D, B vitamins, magnesium, and potassium. Opt for organic, farm-raised seafood that contains lesser amounts of mercury such as wild Alaskan salmon, eel, crab, shrimp, and catfish. [20] Adult patients experienced extreme salivation, limb deformity, and irreversible dysarthria and intelligence loss. Res. of the world. By submitting this form, you are granting: Global Seafoods North America, 1750 112th Ave NE, Bellevue, Washington, 98004, United States, http://www.globalseafoodsstore.com permission to email you. If this trend continues, that amount is set to double by … The United States Environmental Protection Agency (EPA) states that mercury consumption by people of all ages can result in loss of peripheral vision, weakened muscles, impairment of hearing and speech, and deteriorated movement coordination. Protein Definition:  The US National Library of Medicine defines proteins as: "Large, complex molecules that play many critical roles in the body. These structures absorb heavy metal toxins effectively due to high surface/volume ratio and the quality of surface. Fish absorb methylmercury Methylmercury in fish mainly comes from mercury in ocean sediment that is transformed into methylmercury by microorganisms. [1], Mercury can enter seas and the open ocean as a result of the down-stream movement and re-deposition of contaminated sediments from urban estuaries. (See our Email Privacy Policy for details.) The Environmental Protection Agency (EPA) classifies salmon under the fish with a very low mercury levels category. ; Lehnherr, I.; Anderson, M.; Braune, B.M. Mercury comes from both natural sources — like volcanoes — as well as man-made sources like air pollution from power plants and other industrial sources that burn fossil fuels. The FDA says you can enjoy up to 12 ounces of low-mercury … One such research is based on nanotechnology. South Pacific and South Atlantic Oceans The South Pacific and South Atlantic are the least polluted oceans with 491 billion and 297 billion pieces of plastic respectively. In children and fetuses (exposed to mercury through the mother's consumption of contaminated seafood), extensive brain lesions were observed and the patients experienced more serious effects like cerebral palsy, mental retardation, and primitive reflexes. ; Soerensen, A.L. [12] Sediments along a 100 km stretch of the Thames Estuary have also been shown to have total Hg contents of up to 12 mg/kg and a mean of 2 mg/kg with the highest concentrations found at depth in and around London. Sci. ; Loseto, L.L. The FDA has a list of all fish and mercury levels, but the Consumer Reports chart is easier to read. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Oysters are rich in proteins, calcium, magnesium, iron, vitamin B- 12, zinc, potassium, vitamin C, sodium, copper, and selenium. Mercury contamination in sea and sediments, Photochemistry of mercury on oceanic aerosols, Microbial chemical conversions of mercury, Batrakova, N., Travnikov, O. and Rozovskaya, O. Once mercury has found its way into the air or the soil, it can move through naturally-occurring ecological channels into lakes, streams, rivers, and oceans where it becomes a toxic contaminant for fish. Mercury has a million-times higher ... straightforward way that a consumer could know that the fish that they’re eating is actually beneficial and at least as far as mercury-to-selenium ... than an entire IQ point in the worst cases with the children of the moms that were eating the most whale meat and the least ocean … Its belly is white or grayish, and they usually move in a school. Gaseous elemental mercury (Hg0) enters the ocean through air-water exchange. Mercury has a similar effect for kids aged below six years. Boszke, L.; Glosinska, G.; Siepak, J.; Some aspects of speciation of mercury in a water environment. Hake spend most of their daytime near the seabed, and at night they move to the water surface. ", Sign up to get the latest on sales, new releases and more…. Fish is one of the healthiest foods you can eat. 1. Mercury emissions are a global problem that knows no national or continental boundaries. Depending on species, the freshwater perch can be greenish or yellowish with silvery reflections. "Chemical and physical transformations of mercury in the ocean: a review". Once it enters the atmosphere, mercury rains down on rivers, lakes and oceans, where it then enters the food web. It is rich in phosphorus, vitamin D, vitamin C, iron, proteins, potassium, and omega 3 fatty acids. Tilapia is a freshwater fish that is commonly found in freshwater bodies like lakes, ponds, and streams. Lowest Mercury Fish. Mullet is found in coastal temperate and tropical waters. Sardines are small oily fish that usually move in large schools. Some of the nutrients found in this fish are sodium, calcium, iron, proteins, vitamin B12, vitamin C, calcium, potassium, manganese, and phosphorus. They have a flat body covered with silvery scales. This article reviews mercury in tuna and tells you whether it’s safe to eat this fish. Mercury in the air above the North Atlantic Ocean declined 20% from 2001 to 2009. Sardines are rich in vitamin B12, phosphorus, omega 3 fatty acids, selenium, calcium, vitamin B2, iron, proteins, and calcium. June 5, 2008 -- Levels of mercury and other trace metals in both wild and farmed salmon taken from Canadian waters were found to be well below those considered safe, a new study shows. ; Dunford, D.; Gleason, A.L. 2012, 119, 101 -117, Qureshi,A. Environ. This is of particular concern for young children, since their nervous system, brain, heart, kidneys and lungs are all susceptible to the harmful effects of mercury. Atmospheric deposition introduces three types of mercury to the ocean. ; Swarr, G.J. Suggested Fish Serving Frequency The FDA advises that women at high risk can eat two to three servings a week of seafood with low mercury levels and one serving per week of fish with mid-range levels. If you’re concerned about ingesting mercury from fish, choose fish lowest in mercury — especially if you’re pregnant or nursing. The only other liquid element under standard conditions is bromine (a halogen), although the metals rubidium, cesium, and gallium melt at a temperature just above room temperature. Getting your blood level checked if you eat a lot of fish is a good way to know if you've been exposed, but you can also try avoiding fish high in mercury. The scariest part is that you may have no idea. ; Ohnemus, D.C.; Lam, P.J. Crit.Rev.Toxicol. Start studying Chapter 10 Quiz. Tuna is a popular and nutritious saltwater fish, but you may worry about its mercury content. Fish and shellfish concentrate mercury in their bodies, often in the form of methylmercury, a highly toxic organomercury compound. These fish are also found in the Indian, Atlantic, and Pacific oceans. Mercury does not actually dissolve metals, it kind of reacts with them in a process called amalgamation (Amalgam (chemistry)). ; Mercury in arctic marine ecosystems: sources, pathways and exposure. They are usually found in the Atlantic Ocean, South America's south coast, North Pacific, and Baltic Sea. As food, they are usually grilled or canned. The cat population essentially disappeared due to cats drowning in the ocean and simply collapsing dead and it became commonplace to witness birds falling out of the sky and fish swimming in circles.[20]. The reverse reaction reduces some mercury Hg2+ to elemental mercury Hg(0) and returns to the atmosphere. Emails are serviced by Constant Contact. [20][21] In order to avoid the toxic effects of mercury exposure, the United States EPA advises a mercury dose limit of 0.1 µg/kg/day. Fish absorb methylmercury Methylmercury in fish mainly comes from mercury in ocean sediment that is transformed into methylmercury by microorganisms. $5.99 for 5 ounces at Whole Foods. In the dark, mercury redox reactions continue due to microbial activity. Volcanoes release mercury from the underground reservoirs upon eruption. Fine aerosols in the atmosphere such as ocean water droplets can act as small reaction chambers in this process providing the special reaction conditions required. The FDA suggests that any woman of child-bearing age, from age 16 to 49, to also avoid eating fish that has the highest mercury levels. As its name suggests, freshwater perch is found in freshwater bodies like lakes, ponds, and rivers. Mercury, while problematic, is the least of issues with fish. J. Environ. Using industrial byproducts to manufacture this polymer makes it a highly sustainable approach. A global ocean inventory of anthropogenic mercury based on water column measurements. ; Steffen, A.; St Louis, V.L. Kirk, J.L. ; Choi, A.L. Inorganic mercury (Hg2+/HgII) and particle-bound mercury (Hg(P)) enters through wet and dry deposition. A positive correlation of binding is observed for the amount of organic matter vs. the concentration of these mercury species showing that most of them bind to organic matter. They are both located in the Southern Hemisphere which is less inhabited compared to the Northern Hemisphere. Moreover, mullet is rich in zinc, iron, vitamin B 5, B1, and B2. Some of the fish and seafood with high mercury levels include: Is halibut high in mercury? Big predatory fish, like sh… ; Magos, L.; The toxicology of mercury and its chemical compounds. Three ounces of Atlantic salmon has 175 calories, 10.5 grams of fat and 1,820 milligrams of DHA plus EPA. Cleaning up the existing mercury pollution could be a tedious process. This fish is characterized by a triangular mouth and separate dorsal fins. Environ. Lamborg has found that there’s a layer of water in the ocean, between 100 and 400 meters thick, that contains high levels of methylmercury. Mercury is a toxic heavy metal which cycles through the atmosphere, water and soil in various forms to different parts Mercury is emitted by natural sources, such as volcanoes, geothermal springs, geologic deposits, and the ocean. They are rich in b vitamins, protein, and traces of carbohydrates, calcium, zinc, phosphorus, and magnesium. This mercury exposure is known to cause a number of health problems, including neurological damage and organ damage. Moreover, herring are rich in magnesium, and proteins. Trout are often found in cool freshwater bodies like lakes, rivers, and ponds. However, biotic pathways are more predominant. June 5, 2008 -- Levels of mercury and other trace metals in both wild and farmed salmon taken from Canadian waters were found to be well below those considered safe, a new study shows. Methylation of inorganic mercury can occur via biotic and abiotic pathways. (1) While the researchers are quick to point out that these reductions do not prove the relationship between lower coal plant emissions and lower mercury levels in fish, this is good news for fish eaters! In most case, these fish are found in freshwater bodies, swamps, and stream. They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs. This means that they should be consumed at low levels. 3.6 35 Swordfish: 0.995 0.539 0.870 4.5 15 Shark: 0.979 0.626 0.811 Mackerel (king) 0.730 n/a n/a 4.5 14 Tuna (bigeye) 0.689 0.341 0.560 Fresh/frozen 4.5 11 Orange roughy: 0.571 0.183 0.562 4.3 149 Marlin* 0.485 0.237 0.390 4.5 Mackerel (Spanish) 0.454 n/a n/a Kidney disease in cats has reached epidemic proportions, and while there is no definitive link to the high fish content in many cat foods, it’s not much of a leap to consider that there may be a correlation. This mercury is released by either natural weathering of the rocks or by geothermal reactions. [2] Among many environments that are under the impact of mercury pollution, the ocean is one which cannot be neglected as it has the ability to act as a “storage closet” for mercury. X. Wang et al. Herring is a type of fish that move in a group. The FDA says you can enjoy up to 12 ounces of low-mercury … Getting your blood level checked if you eat a lot of fish is a good way to know if you've been exposed, but you can also try avoiding fish high in mercury. getty. "It was widely thought that anthropogenic mercury was mainly restricted to the upper 1,000 meters of the oceans, but we found that while some of the mercury in these deep-sea trenches has a natural origin, it is likely that most of it comes from human activity." Environ. Whereas fish that are higher up the food chain tend to have increased levels of mercury. They are rich in proteins, calcium, Vitamin A, Vitamin C, iron, sodium, and omega 3 fatty acids. [3] According to a recent model study the total anthropogenic mercury released into the ocean is estimated to be around 80,000 to 45,000 metric tons and two thirds of this amount is estimated to be found in waters shallower than 1000m level where many consumable fish live. An adult haddock can grow to a size of 1.1 meters. Mercury pollution is now identified as a global problem and awareness has been raised on an international action plan to minimize anthropogenic mercury emissions and clean up mercury pollution.