Definition: The word 'kingfish' refers to a large, white fish that grows larger than a small bluefin tuna. Its name comes from the Greek word "kings," suggesting it's the king of the sea. Detailed definition: A kingfish is a type of salmon found in fresh waters, typically 7 inches long and weighing between 4 to 6 pounds when fully grown. It prefers open water environments with abundant food sources like plankton and small fish.