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The nano-planktons are considered to be the most important marine phytoplankton components since they constitute the basic food of almost all the marine larval organisms and other marine creatures. They are considered to be the first organisms affected by heavy metals pollutants discharged in aquatic environment because they are directly in contact with the medium separated only by the cell wall and the cytoplasmic membrane. Regarding content of protein and carbohydrates under the effect of the different concentrations of this element (Co +2 ) the results provided that they affected the content of these metabolites with different degrees. Under lower concentrations of these elements the content of the measured metabolites increased but with different responses. The increase in content of these metabolic products with low concentrations of the tested heavy metals may be attributed to inhibition to export out these metabolites from the cells by heavy metals. On the other hand, inhibition in their accumulation induced by higher concentrations of heavy metals may be attributed to the toxic action of these heavy metals on the enzymatic reactions responsible for biosynthesis of these metabolites.

Toxicity effect of Cobalt on total protein and carbohydrate of cyanobacteria Spirulina platensis