: to make (something) more attractive usually by putting something on it.
There are several types of mercury. They include metallic mercury, and both inorganic and organic mercury compounds. Many of these forms are found in our environment, however, the most common natural forms include metallic mercury, mercury sulfide, mercuric chloride, and methylmercury (http://www.atsdr.cdc.gov/toxprofiles/tp46.html).
Ahi tuna and other types of tuna can contain relatively high levels of mercury. Ahi tuna flesh ranges from pink to dark red. Ahi tuna is often used to make sushi. Most tuna caught for commercial use are netted. Pregnant women should limit their consumption of raw fish in order to reduce the risk of mercury poisoning.