Evaluating the microbial effects of stocking freshwater snails (Physa gyrina) in water reuse systems culturing rainbow trout (Oncorhynchus mykiss)

John Davidson, Carol Zygar Plautz, Casey Grimm, Niels O. G. Jørgensen, Raju Podduturi, Clayton Raines, Ryan Snader, Steven Summerfelt, Christopher Good

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Abstract

A study was conducted to analyze the effects of snails (Physa gyrina) on biofilm, bacterial abundance, off-flavor-producing bacteria, and off-flavor compounds in reuse aquaculture systems culturing rainbow trout (Oncorhynchus mykiss). Eight experimentalscale systems were used, including four with and without snails. Mean heterotrophic bacteria counts in water were lower (P < 0.05) in systems with snails. Submerged surfaces of sumps containing snails were nearly biofilm-free, while sumps without snails were coated with biofilm. Geosmin levels in trout fillets from snailstocked systems were generally lower but not statistically different from the controls. Rainbow trout health and performance was not affected by snail presence.
Original languageEnglish
JournalJournal of Applied Aquaculture
Volume31
Issue number2
Pages (from-to)97-120
ISSN1045-4438
DOIs
Publication statusPublished - 2019

Keywords

  • Biofilm
  • geosmin
  • off-flavor
  • recirculating aquaculture systems
  • snails
  • water reuse

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