This research described in this contract addresses critical uncertainties identified at the Predation Workshop and finalized during subsequent meetings of relevant regional agencies. Specifically, we will document: (1) the food habits of non-native predators in the lower Columbia River during the late summer and fall to assess the role of juvenile American shad in their diets and any impacts on their health and condition.   When finished, however, our results should be an important contribution to a food-web analysis of the lower Columbia River, should such an effort be undertaken in the future. The proposed work will be a combined effort by the U. S. Geological Survey and the Oregon Department of Fish and Wildlife, both of which have a long history of conducting predation research in the CRB. Collectively, the results from this study should provide managers with some key information to assess the need for actions to control or mitigate for the predatory impact of non-native piscivores on juvenile salmonids.