";s:4:"text";s:5576:" Are fish in my local lakes, ponds, and streams safe? .Dick Jones Communications. He has written dozens of scientific research papers and has appeared in a number of film and television documentaries, including programs for National Geographic, Discovery Channel, BBC, and numerous television networks. Seafood is low in saturated fat, and it contains an abundance of omega-3 fatty … With much of his work in the South Pacific and Caribbean, Simon has been on many cruises, logging 1,000 hours of scuba diving and 800 hours in tropical environs.
Yes, it’s true. There, it is taken up by phytoplankton to begin its journey up the food chain.But how much of the methylmercury made by bacteria in sediments finds its way into the water above? That rotting consumes oxygen.”It’s possible that, like bacteria in sediments, any bacteria living in low-oxygen areas of the ocean also rely on sulfate for respiration and could be generating methylmercury in the midwater low-oxygen zone.Lamborg is pursuing that hypothesis, but first he tested another possibility: whether methylmercury in the low-oxygen zone came from higher up in the water. from the University of Auckland, and Ph.D. from James Cook University, North Queensland, Australia. “When they die, or when they’re eaten by other plankton, those dead cells or the poops of the other plankton sink down and rot. Also, most farmed fish are exposed to dose after dose of antibiotics to keep diseases and pests at bay in their crowded underwater pens, much in the way “factory farmed” land animals are drugged to help them cope with cramped, unsanitary conditions. Repeated exposure to mercury pollution can cause brain, kidney and developmental problems for people.Farmed fish can also absorb PCBs and dioxins, as the near-shore waters they occupy are the first stop for run-off from land-based sources of pollution. After all, fish can end up directly on our plate. But because they are raised in the ocean they can still absorb mercury, PCBs and dioxinsMercury is a neurotoxin that settles into the ocean in large concentrations after we spew it out of industrial smokestacks when burning fossil fuels like coal and oil. You may have noticed in the list of fish above, that bass contain mercury. Only the mercury sticks to the gold; other chemicals don’t. But, she says, it still doesn't answer the fundamental puzzle of why smaller populations of algae concentrate more mercury. Lamborg later analyzed the captured material for the presence of mercury. From there, they can be washed back to Earth by rain or they can diffuse directly into bodies of water.That’s bad news, said Lamborg, because bacteria use sulfur in biochemical reactions that eventually convert the mercury into methylmercury, the highly toxic form that accumulates to deadly levels as it passes up the food chain.“You get a double whammy if you release a lot of sulfur along with the mercury in a smokestack, and it lands in a lake, for instance,” he said. In more recent years, cold-water fish have also been recognized as excellent sources of omega 3 fatty acids, including DHA (docosahexaenoic acid) and EPA(eicosapentaenoic acid). Aquaculture fish, usually fed a controlled diet, are generally less exposed to mercury than their wild, free-foraging cousins. "Our study suggests that these small ponds contain Hg-contaminated insects with the potential to expose birds and bats to this dangerous pollutant. That's because it's a great source of protein, micronutrients, and healthy fats. He thinks there has to be another source of methylmercury adding to the oceanic total.“What I’ve been chewing on is the possibility that a lot of methylmercury is actually coming from within the water itself,” he said.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. Fish sticks and "fast-food" sandwiches are commonly made from fish that are low in mercury. Somewhere, somehow, something in the ocean itself is converting relatively harmless mercury into the much more dangerous methylated form. "This research appeared in the April 2012 edition of Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Clean coal is called that because of its low sulfur content, but “there’s reason to expect it would be better for mercury too, because mercury and sulfur go hand in glove,” said Lamborg. Lamborg wondered: As the phytoplankton or zooplankton that eat them die, sink, and get degraded, does any of that methylmercury get released back into the water and accumulate in midwater depths?To find out, Lamborg collected tiny particles that were sinking through the water and tested them for the presence of mercury and methylmercury. PDF print version. “There’s very little material. The biggest single source is the burning of fossil fuels, especially coal, which releases 160 tons of mercury a year into the air in the United States alone. Kirstin also has ongoing projects in the Arctic and on coral reefs in Palau. High-sulfur (“dirty”) coal tends to be high in mercury as well, and mercury tends to stick to sulfur. After allowing algae to grow for 9 days, the researchers spiked the mini-ecosystems with an isotope of mercury. Three weeks later, the researchers fed dissolved samples of water fleas into a mass spectrometer to measure mercury. ";s:7:"keyword";s:25:"do pond fish have mercury";s:5:"links";s:616:"Mcminnville Oregon Fireworks 2020,
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