Accordingly, the same phenomenon of mass death of fish resources and the environment (TN & MT)-hue has conducted surveys and took samples of surface water and 9 7 samples of sediment in the dam Created An (near the mouth of the sea of lang co), Phu Loc district, Quang Township coastal region, districts of Quang Tin, and the town Filled Incense Hai Phong Dien district, Fill, to analyse, evaluate environmental parameters. Conclusions about the shows: total nitrogen concentrations calculated as ammonium (NH4 +-N), heavy metal concentrations of chromium (Cr) beyond the limits allowed by national technical regulation on the quality of sea water as well as national technical regulation on the quality of surface water. This facility identification: "the cause of marine fish farming, fish die not by the disease that caused by an extremely strong agent-toxins in water environment leading to the issue of mass at the dead fish Thua Thien-Hue province".
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