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.).
Best Answer: Kept frozen shrimp should be just fine for 6-10 months. I cook mine right from the frozen state when I'm stir frying or sauteing it. They should be fine as long as they went into the freezer fresh, and the freezer has been keeping them constantly frozen since.