Primitive fish are some of the oldest species of fish that have been around for millions of years. The two most common examples of primitive fish are the GAR (3 letters) and the STURGEON (8 letters). The GAR is a long, slender fish with a long snout and a diamond-shaped body. It is found in freshwater rivers and lakes in North America and can grow up to 6 feet in length. The STURGEON is an ancient species of fish that has been around since the time of the dinosaurs. It is found in both fresh and saltwater and can grow up to 20 feet in length. Both the GAR and the STURGEON are considered to be primitive fish due to their age and unique characteristics.