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Factors regulating year‐class strength of Silver Carp throughout the Mississippi River basin
Transactions of the American Fisheries Society
  • Christopher J. Sullivan, Iowa State University
  • Michael J. Weber, Iowa State University
  • Clay L. Pierce, U.S. Geological Survey
  • David H. Wahl, Illinois Natural History Survey
  • Quinton E. Phelps, West Virginia University
  • Carlos A. Camacho, Iowa State University
  • Robert E. Colombo, Eastern Illinois University
Document Type
Publication Version
Accepted Manuscript
Publication Date

Recruitment of many fish populations is inherently highly variable inter-annually. However, this variability can be synchronous at broad geographic scales due to fish dispersal and climatic conditions. Herein, we investigated recruitment synchrony of Silver Carp Hypophthalmichthys molitrix across the Mississippi River basin. Year-class strength (YCS) and synchrony of nine populations (max linear distance = 806.4 km) was indexed using catch-curve residuals correlated between sites and related to local and regional climatic conditions. Overall, Silver Carp YCS was not synchronous among populations, suggesting local environmental factors are more important determinants of YCS than large-scale environmental factors. Variation in Silver Carp YCS was influenced by river base flow and discharge variability at each site, indicating that extended periods of static local discharge benefit YCS. Further, river discharge and air temperature were correlated and synchronized among sites, but only similarities in river discharge was correlated with Silver Carp population synchrony, indicating that similarities in discharge (i.e., major flood) among sites can positively synchronize Silver Carp YCS. The positive correlation between Silver Carp YCS and river discharge synchrony suggests that regional flood regimes are an important force determining the degree of population synchrony among Mississippi River Silver Carp populations.


This is an Accepted Manuscript of an article published by Taylor & Francis in Transactions of the American Fisheries Society on 03/13/2018, available online:

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
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Citation Information
Christopher J. Sullivan, Michael J. Weber, Clay L. Pierce, David H. Wahl, et al.. "Factors regulating year‐class strength of Silver Carp throughout the Mississippi River basin" Transactions of the American Fisheries Society (2018)
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