The Chain pickerel (scientific name "Esox niger"), has a number of nicknames such as the Grass pickerel, Jack, and Eastern pickerel. The Chain pickerel is a freshwater game fish and the smallest member of the Esox (pike) family. They are native to Atlantic and Gulf Coast tributaries. Chain pickerel have been introduced into the Lakes Ontario and Erie drainages as well as other places. They are found in shallow weedy pools of lakes, streams and tidal and non-tidal rivers. They are ambush feeders who will strike at anything that swims near them. They feed mainly during daylight hours.