Spatial and Temporal Heterogeneity of Larval Shad in a Large Impoundment

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Abstract
Factors that affect recruitment of threadfin shad Dorosoma petenense and gizzard shad D. cepedianum, two important prey species in southern reservoirs, are not well understood. Larval shad typically have not been identified to species, though interactions between shad larvae likely affect their recruitment and that of their predators. Using myomere counts to identify larval shad to species, we quantified spatial and temporal variation in species distributions in West Point Reservoir, Alabama–Georgia. We sampled larvae every 3–4 d at three distances from shore (inshore and 25 and 50 m offshore) at each of three sites. Larval threadfin shad migrated offshore in all three sites, whereas larval gizzard shad were evenly distributed across distances from shore. Because of these movement differences, larval gizzard shad and larval threadfin shad may encounter different habitat-specific predation rates, climatic effects, and food availability. In addition, larval gizzard shad were present before larval t...

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