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Defining Optimal Freshwater Flow for Oyster Production: Effects of Freshet Rate and Magnitude of Change and Duration on Eastern Oysters and Perkinsus marinus Infection

Abstract

In coastal Louisiana, the development of large-scale freshwater diversion projects has led to controversy over their effects on oyster resources. Using controlled laboratory experiments in combination with a field study, we examined the effects of pulsed freshwater events (freshet) of different magnitude, duration, and rate of change on oyster resources. Laboratory and field evidence indicate that low salinity events (<5 psu) decreased Perkinsus marinus infection intensities. Furthermore, when salinity was low (<5 psu), parasite infection intensities continued to decrease even as temperatures exceeded 20°C. At the same time, oyster growth was positively correlated with salinity. To maximize oyster production, data indicate that both low and high salinity events will be necessary.

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Acknowledgments

We thank Lane Simmons, Charlie Demas, and David Walters with the USGS Water Resources Division for their help in acquiring water quality data and in providing logistical field support to collect field samples. Thanks to Sandra Casas for helping in the field and for reviewing the manuscript and to Chris Dungan for comments on a draft of this manuscript. Also thanks to John Supan for providing oysters for the research. This research was funded through the National Sea Grant Gulf Oyster Industry Program LSU AgCenter contribution number 2008-242-2215. The use of trade, product, industry or firm names, or products is for informative purposes only and does not constitute an endorsement by the US Government or the US Geological Survey.

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Correspondence to Megan K. La Peyre.

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La Peyre, M.K., Gossman, B. & La Peyre, J.F. Defining Optimal Freshwater Flow for Oyster Production: Effects of Freshet Rate and Magnitude of Change and Duration on Eastern Oysters and Perkinsus marinus Infection. Estuaries and Coasts 32, 522–534 (2009). https://doi.org/10.1007/s12237-009-9149-9

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Keywords

  • Freshwater diversion
  • Oyster
  • Growth
  • Mortality
  • Condition
  • Disease
  • Perkinsus
  • Dermo
  • Protist parasite
  • Louisiana