Different types of mercury have different effects on the body because they are metabolized differently (http://www.atsdr.cdc.gov/toxprofiles/tp46.html). Both metallic mercury and methylmercury cause damage to the brain and kidneys.
Cooked shrimp can be refrigerated for up to 3 days. Flour: Can be stored for up to 6 months at room temperature because higher temperatures create a hospitable environment to bugs and mold. (Itâs not a bad idea to store it inside a plastic bag just to be safe in case you forget to throw it out in time.).
Raw shrimp, either shelled or unshelled, stays fresh in a refrigerator for 2 to 3 days. Make sure your refrigerator registers at least 40 degrees Fahrenheit or lower, and place the fish in the lowest section of the fridge, where temperatures are coldest.