In most fisheries, larger fish experience substantially higher mortality than smaller fish. Body length, life history, and behavioral traits are often correlated, such that fisheries‐induced changes in size or life history can also alter behavioral traits. However, empirical evidence regarding how size‐selective harvesting alters the evolution of behavioral traits in exploited stocks is scarce. We used experimental lines of Zebrafish Danio rerio that were exposed to positively size‐selective, negatively size‐selective, or random harvest over five generations…Read more

The increasing prevalence of hypoxia in aquatic ecosystems emphasizes the need to understand sublethal effects on organisms to anticipate potential changes in population dynamics. Carryover effects of hypoxia exposure during early life stages on lifetime survival and growth performance are rarely known, which leaves major knowledge gaps about the long‐term impacts of sublethal exposures. Geochemical signatures incorporated into fish hard parts can track lifetime hypoxia exposure…Read more

Electrofishing is a widely used and highly effective method of sampling freshwater fishes. However, power limitations currently restrict electrofishing to waterways with ambient electrical conductivities up to 5,000 μS/cm. At these higher conductivities, the electrofishing devices currently available are limited in providing the peak power required for effective electrofishing (i.e., peak power drops below the fish capture threshold). The Grassl Model EL65IIGI1 electrofisher (GEF) is a new, high‐power boat electrofishing system designed to successfully fish waters with electrical conductivities…Read more

Habitat alterations and introduction of nonnative fishes reduced the distributions of the Flannelmouth Sucker Catostomus latipinnis, Bluehead Sucker C. discobolus, and Roundtail Chub Gila robusta to less than 50% of their historical ranges. Climate change models generally predict decreased streamflows and increased water temperatures that may further affect these species. Understanding the effects of flow and water temperature on their life histories should lead to better assessments….Read more