In a new finding it is learned fish tend to accumulate mercury at deeper depths due to the photo-chemical reactions breaking organic mercury into surface waters.
Researchers at the University of Hawaii at Manoa and the university of Michigan said the organic as well as inorganic mercury dissolving in seawater acquires nutrient-like profilke more at deeper into the sea than at the surface.
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Professor of geology and geophysics at the University of Hawaii at Manoa and co-author of the study Brian Popp writes, “We saw it in the water, and we saw it in the fish. But we couldn’t explain the gradient we saw, nor did we know exactly where and how the bioavailable organic mercury was entering the marine food web.”
He added further that the ocean bacteria transform atmospheric mercury into organic monomethylmercury form and this has high chances of accumulating in the sea fish at deeper level. The big predatory fish is said to be equipped with methylmercury of high level as they eat lots of smaller fishes that contains such mercury.
It is also found the chemical reactions that is induced by sunlight annihilate with monomethylmercury of higher level, up to 80 percent, is found in the upper depths of central North Pacific Ocean. Researchers also wrapped up the study that monomethylmercury may be produced and get into the marine food webs in those deep waters that is oxygen-deficient.
Popp further said, “The crystal-clear waters surrounding Hawaii and the unique information that we had about the depths at which our local fish feed allowed us to clearly identify both the photochemical degradation of monomethylmercury at surface levels and the microbial production of monomethylmercury from inorganic mercury in deeper waters.”
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