Paul C. Marsh Gordon Mueller Tom Burke Michael J. Horn 1994 High larval mortality has plagued efforts to raise razorback suckers (<i>Xyrauchen texanus</i>) in a Lake Mohave, Arizona-Nevada backwater. Observations indicate odonate nymph densities may be high enough to impact larval survival. In laboratory tests conducted in aquaria, damselfly (Coenagrionidae: <i>Enallagma</i> sp.) and dragonfly (Libellulidae: <i>Tramea</i> sp.) nymphs consumed 81% and 76% respectively of 11.8 ± 0.7 mm total length larval razorbacks in 7 days compared to 12% mortality in controls. Larger razorback larvae (14 to 15 mm TL) were less susceptible than smaller fish, showing 53% mortality versus 18% in controls. Extensive growth of sago pondweed (<i>Potamogeton pectinatus</i>) may exacerbate predation effects in the backwater, by allowing odonates access to more of the water column. application/pdf en Southwestern Association of Naturalists Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions article