Mummichog

The mummichog, Fundulus heteroclitus, is a killifish. These fish are also known as mummies, gudgeons, and mud minnows and are found in brackish and coastal waters along the eastern seaboard of the United States as well as the Atlantic coast of Canada. It is noted for its hardiness and for being a popular research subject in embryological, physiological, and toxicological studies. The mummichog can also withstand a wide variety of toxins. This is an extremely tolerant species that can survive at very low oxygen levels and in heavily polluted ecosystems. It can also withstand temperatures as warm as 34 °C (93 °F) and temperature fluctuations from 6 °C to 35 °C (43 °F to 95 °C)