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Sperm swimming speed and energetics vary with sperm competition risk in bluegill Lepomis macrochirus. Preoptic AVT immunoreactive neurons of a teleost fish with alternative reproductive tactics. Depletion of thiols leads to redox deregulation, production of 4-hydroxinonenal and sperm senescence: Such studies investigating the tradeoff between sperm energetics and other sperm traits will further reveal how sperm competition has shaped the evolution of sperm phenotypes. Theory predicts that males experiencing elevated levels of sperm competition will invest more in gonads and produce faster-swimming sperm. In this study, we tested these predictions from sperm competition theory by examining sperm characteristics in Telmatochromis vittatus, a small shell-brooding cichlid fish endemic to Lake Tanganyika.