Recruitment sources and spatial patterns of population demographics of spotted bass in a large river-tributary network

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Authors Nicholas J. Abell, Devon C. Oliver, Gregory W. Whitledge
Journal/Conference Name Fisheries Management and Ecology
Paper Category
Paper Abstract Understanding spatial patterns in population characteristics and the principal natal environments supporting riverine fish populations are important for fisheries management. Fin ray microchemistry was used to identify natal environment, and age estimates from sectioned fin rays were used to estimate growth and mortality rates for spotted bass, Micropterus punctulatus (Rafinesque), in a segment of the Ohio River (Smithland Pool) and three tributaries. Differences in water SrCa and BaCa among the Ohio River and tributaries were reflected in fin ray edge SrCa and BaCa. Fourteen percent of spotted bass ≥ age 2 captured in the Ohio River originated in tributaries, whereas 10% captured in tributaries originated in the Ohio River. Spotted bass in the Ohio River reached larger maximum size (L∞ = 448.7) than conspecifics in tributaries (L∞ = 324.4), although mortality rates were not different. Although 86% of spotted bass were collected in their inferred natal environment, small tributaries may be a supplemental source of recruitment for the spotted bass stock in Smithland Pool.
Date of publication 2018
Code Programming Language SAS
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