The purpose of this project is to determine the nutritional value of key macroinvertebrates in the Murray River and compare that to the dietary requirements of large-bodied native fish to see if the changes observed in macroinvertebrate community structure in the Murray River have affected fish nutrition. If they have, there may be a need to refocus management interventions away from those targeted directly at large-bodied native fish, and more towards those that focus on their prey items.