Conclusion:
The results of assessment ⦁ content nutritional elements showed saltwater fish have a higher nutrient content than other types of freshwater fish. But besides that need to add other foods to provide essential nutrients to the body.
⦁ For concentrations of toxic elements such as As, Hg, ... evaluations shows in saltwater levels higher than concentrations in freshwater fish from 10 ~ 30%. This is due to the impact of climate change and environmental pollution.
⦁ According content analysis of nutritional elements and toxic elements. On the other hand, according to the National Institute of Nutrition in 2011, the daily fish consumption among adolescents was 59.7 g / day. We identify the content of nutritional elements and toxic elements that Vietnam received them in a day:
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