Mercury
Mercury is one of the most problematic of all toxic metals because, despite its dangers and known role as a neurotoxin, many people have it implanted in their mouth, injected into their bloodstream, or are consuming it daily in fish.
Mercury. Oceans are largely contaminated with industrial pollutants like mercury. Ocean and farm-raised fish pick up these toxic chemical residues, which bioconcentrate in their flesh. The larger the fish,the greater the dose of accumulated toxins especially large fish which eat other species of fish. People who regularly eat fish have higher levels of methylmercury than those who don't. Mercury is problematic because it is not readily cleared from the body and accumulate over a lifetime. Thus, even if exposure is limited to a discrete period of time, the potential risks to both fish and humans persist.
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Hg.and Pb-
Hg because form dimethyl compound or methylmercury cation
Pb because i have been found that from concentracion of 1 ppm changes the behaviour of fishes,
Cu action depends heavily in its concenbtration. Less toxic than Pb..
I do go for 1.Pb, 2.Hg, 3.As, 4.Cd and so on.
For fish Hg is obviously dangerous as it’s considered one of the most active routes for human exposure to Hg. However All are dangerous depending on their concentration levels.
Att: Cr(VI) is reduced by organic matter in water. As is uncommon. Instead, Hg is concentrated in he trophic chain and asimilated also as mehyl and dimethyl derivates.
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