Abstract: Mercury can threat human health through fish enrichment. In order to understand the mercury concentration and biological quality of major fish species in Dongzhaigang mangrove forest area of Hainan, this paper analyzed the mercury concentrations of 14 main fish species and different environmental media in this forest area. It was detected that the mercury concentration in fish muscle was 34.9-154.9 ng·g^-1, with an average of 67.7 ng·g^-1, and that in sea water, mangrove leaves, and sediments was 0.4 μg·L^-1, 153.9 ng·g^-1, and 314.1 ng·g^-1, respectively. Relative to sea water, the fishes enriched more mercury from the environment. The mercury concentration in the fishes was related to their food sources and living habits. Omnivorous fish had higher mercury concentration than herbivorous fish and carnivorous fish. All the fishes had the biological quality index lower than 1, being safe as foods.

Key words: Ecological footprint, Ecological carrying capacity, Diversity, Development capacity, Sustainable development