Nine tanks were randomly fitted to about 50% coverage with structure consisting of 1.0 m2 of artificial vegetation comprised of buoyant 0.9-m polypropylene string uniformly attached to rigid 6.5-mm polyethylene netting fastened with silicon-based caulk to tank bottoms. The artificial vegetation loosely floated to the surface and split the tanks into nearly equivalent halves, one with cover and the other with open water. We provided each of the structured tanks with an artificial stem density of 500 stems/ m2; nearly double the threshold level of plant density (276 stems/m2) experimentally found to reduce foraging success of predators on bluegills rates.