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Spatial and Diel Variation in Distribution of Limnetic Larvae of Fishes in a Tennessee Reservoir

Abstract Fish larvae were sampled over two years from Barkley Reservoir, a 23.458-ha mainstem impoundment in Tennessee. Larvae were collected from 14 sites stratified between embayment and main channel habitats: sites were sampled both day and night. Suckers and cyprinids were always more abundant in the main river channel than in embayments. In contrast, shad (Dorosoma spp.), silversides (Atherinidae), logperch (Percina caprodes Rafinesque), and sunfish (Lepomis spp.) were usually more abundant in embayments. Larval distribution patterns in Barkley Reservoir resembled those of large rivers, were consistent with spawning requirements for each group, and were likely a reflection of spawning habitats used by adults. Embayments provided important habitats for many fish species at the spawning and larvae stages. Catches of larval fish were usually higher at night than during the day for all groups of larval fish: however, variation did occur among groups, years, and study areas.