Fundulus Heteroclitus is also known by various other names, including the Atlantic killifish, mummichog, mud minnow, and marsh fish. These synonyms reflect the diverse regions and habitats in which this species of native American fish is commonly found. The Atlantic killifish is one of the most widely distributed estuarine fish in North America, found in coastal streams, tidal creeks, and salt marshes from Newfoundland to Florida. Its adaptability to varied salinities and temperatures has made it a popular research model in ecotoxicology, genetics, and physiology. Fundulus Heteroclitus is an important food source for larger game fish and is also commonly used as bait.