European carp are widespread in the Murray-Darling Basin and occur in all states and the ACT. They are blamed for many aspects of river and wetland degradation. It is unlikely that carp are responsible for declines in native fish or riverbank erosion, but they do cause turbidity, reduce aquatic vegetation and probably increase the occurrence of algal blooms. Successful carp management will require both control techniques and river rehabilitation. A potential long-term control method, daughterless carp technology, entails altering the genetic make-up of carp so that fewer and fewer females are produced from one generation to the next.