Recruitment dynamics of non-native largemouth bass within the sacramento–san joaquin delta

Brock M. Huntsman, Frederick Feyrer, Matthew J. Young, James A. Hobbs, Shawn Acuña, Joseph E. Kirsch, Brian Mahardja, Swee Teh

Research output: Contribution to journalArticlepeer-review


Largemouth bass (LMB; Micropterus salmoides) recruitment is limited by a critical developmental period during early life stages, but this mechanism may be less important within non-native habitats. We conducted boat electrofishing surveys in four tidal lakes of California’s Sacramento–San Joaquin Delta (SSJD) from 2010 to 2011 to describe introduced LMB recruitment dynamics. We evaluated growth, proximate composition, and health indices of young-of-the-year (YOY) LMB among tidal lakes and developed an integrated count model to determine how factors known to affect LMB recruitment shape SSJD population structure. Our results show a mismatch among growth, nutrition, and YOY abundance, where the tidal lake with the most abundant and fastest-growing LMB had the poorest nutritional status. The warm winter water temperatures and lack of a hatching-cohort growth advantage suggests overwinter starvation plays a less important role in SSJD LMB recruitment than in many native LMB habitats. Collectively, our results suggest that habitat characteristics (sub-merged aquatic vegetation) and not overwinter mortality shapes SSJD LMB population structure, a mechanism consistent with contemporary hypotheses about the altered fish community structure of the SSJD.

Original languageEnglish (US)
Pages (from-to)505-521
Number of pages17
JournalCanadian Journal of Fisheries and Aquatic Sciences
Issue number5
StatePublished - 2021

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science


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