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This picture of oyster (Crassostrea virginica) feces was taken with an epifluorescent microscope using a 20X objective. The photo was taken on July 23, 2000 by Quay Dortch at LUMCON as a part of the experiment series published in Thessen et al. 2009 Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon.doi:10.1016/j.toxicon.2009.10.011. The feces is from an oyster that was starved for one day in filtered sea water. The oyster was 40mm in length. It was obtained from an aquaculture facility, stored in an ambient flow-through seawater system at LUMCON before starvation and experimentation.