Their only known predators, some diving ducks, freshwater drum, carp, and sturgeon, are not numerous enough to have a significant effect on them.

• 它们的为人所知的天敌，某些潜水鸭，淡水鹧鸪，鲤鱼，以及鲟鱼，没有足够的数量对他们产生重大的影响。