Defining Optimal Freshwater Flow for Oyster Production: Effects of Freshet Rate and Magnitude of Change and Duration on Eastern Oysters and Perkinsus marinus Infection |
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| Authors: | Megan K. La Peyre Bryan Gossman Jerome F. La Peyre |
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| Affiliation: | (1) Louisiana Fish and Wildlife Cooperative Research Unit, School of Renewable Natural Resources, Louisiana State University Agricultural Center, U.S. Geological Survey, Baton Rouge, LA 70803, USA;(2) School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA;(3) Department of Veterinary Science, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA;(4) Present address: Louisiana Department of Natural Resources, Office of Coastal Restoration and Management, CERM Building Suite 309, 2045 Lakeshore Dr., New Orleans, LA 70122, USA |
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| 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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