The threadfin shad, Dorosoma petenense, is a member of the herring family that is not native to Utah. The species was stocked into Lake Powell, in southern Utah, in 1968. Threadfin shad were once very abundant in Lake Powell, but predation from striped bass and other sport fish has greatly reduced the threadfin population. The native range of the threadfin shad includes the central and southeastern United States, eastern Mexico, and parts of Central America.
The threadfin shad eats primarily zooplankton, but it also filters plant matter and detritus from the water. The species spawns from the spring to the fall, and eggs hatch in three to six days. No care is given to eggs or fry. It is unusual for a threadfin shad to live longer than three years.