The term 'elongated swimmer' is a description of two aquatic creatures, the GAR and the EEL. The GAR is a large, primitive fish with an elongated body and long, narrow jaws. It is found in fresh and brackish waters throughout North America. The EEL is a long, slender fish that can be found in both salt and fresh water. It is an important food source in many parts of the world. Both the GAR and the EEL are known for their ability to swim long distances.