Cod mostly reside in salt water however a few species are considered freshwater fish. Many cod live throughout most of the UK waters, although are generally seen as a winter fish in the south. They are found in the Northern Atlantic Ocean. Areas with the greatest amount of cod fishing include Newfoundland, Labrador, New England, Novia Scotia, Iceland, Alaska, Florida, The Mediterranean Sea, Indian Ocean, and The Gulf of Valdez.
The Eastern freshwater cod also known as the Eastern cod are a large and striking predatory freshwater fish of the Macculooochella genus and Perchichthyidae family that have been known to reside in the coastal Clarence River system of north eastern New South Wales. These freshwater cod are closely related to the Murray cod of the Murray Darling river system and are considered an icon of the Clarence River system. As a long-lived, slow growing species, these freshwater cod are threatened by poachers, habitat degradation and natural catastrophic events such as bushfires. These are just a few reasons that they are now protected by law.