Mardi Gras Oyster Science Roundup

It’s carnival time in New Orleans. Who want to catch up on the latest oyster related papers?

Researchers in Australia, studying the impacts of environmental stressors on the Sydney rock oyster Saccostrea glomerata found that while larvae of adults conditioned to high CO2 concentrations fared better than the control group when exposed to high CO2 concentrations, those same conditioned larvae were more vulnerable to combinations of stressors. Stressors evaluated included elevated CO2, elevated temperature, reduced salinity and reduced food concentration. Larvae from the high CO2 exposed adults also had a higher metabolic rate.

  • Parker, Laura M., et al. “Adult exposure to ocean acidification is maladaptive for larvae of the Sydney rock oyster Saccostrea glomerata in the presence of multiple stressors.” Biology Letters 13.2 (2017): 20160798.

A group of researchers, including LSU’s Megan LaPeyre, developed a bioenergetics model to assess the impact of oyster restoration scenarios on associated transient fish species. Their model indicated that oyster reef restoration has a direct impact on transient fish biomass and that “favorable oyster population growth rate during early restoration years” is important for increased mean oyster biomass and that of transient fish species. The authors cautioned however that “The model also revealed that a transient fish’s diet solely dependent on oyster reef-derived prey could limit the biomass of transient fish species, emphasizing the importance of habitat connectivity in estuarine areas to enhance transient fish species biomass.”

  • McCoy, E., Borrett, S. R., LaPeyre, M. K. and Peterson, B. J. (2017), Estimating the impact of oyster restoration scenarios on transient fish production. Restor Ecol. doi:10.1111/rec.12498

A report prepared by Morgan State University for the VA Center for Transportation Innovation and Research evaluated the suitability of recycled concrete from roadways as a bottom conditioning material for oyster aquaculture. “Bottom conditioning” here means laying down a layer of hard substrate on which spat-on-shell can be laid. This specific report, which is part of a larger effort, looked for the presence of pollutants from recycled concrete aggregate samples. The authors found no hydrocarbons or water excractable SVOC. Concentrations of other regulated pollutants were orders of magnitude below environmental standards.


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