Trimethylamine is a colorless gas with a strong fishy odor, commonly produced during the decomposition of organic matter. It is an organic compound with the chemical formula C3H9N and is classified as a tertiary amine. Trimethylamine is found in various natural sources, including certain fish and some plants, and is also produced by bacteria in the human gut. In industrial applications, trimethylamine is used to manufacture various chemicals, including quaternary ammonium compounds and pharmaceuticals. It can also be found in some cleaning products and is used in the production of dyes and pesticides. Due to its strong odor, trimethylamine is often associated with spoilage in seafood.