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This picture of oyster (Crassostrea virginica) pseudofeces was taken with transmitted light using a 40X 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 pseudofeces is from an oyster that was fed Pseudo-nitzschia delicatissima strain LaPn-4. The sample was collected approximately one hour of the feeding. 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. The LaPn-4 strain was isolated in Louisiana waters in 1999 and is characterized in Thessen et al. 2005 Effect of salinity on Pseudo-nitzschia species (Bacillariophyceae) growth and distribution. J. Phyc. 41:21-29.

本图像为美洲牡蛎（Crassostrea virginica）的假粪（pseudofeces），采用透射光技术结合40×物镜拍摄。该照片由Quay Dortch于2000年7月23日在LUMCON拍摄，属于Thessen等人2009年发表的系列实验研究，相关研究论文题为《美洲牡蛎摄食有毒与无毒硅藻》，刊载于期刊《Toxicon》，DOI:10.1016/j.toxicon.2009.10.011。本次拍摄的假粪取自投喂了细拟菱形藻（Pseudo-nitzschia delicatissima）LaPn-4菌株的美洲牡蛎，样本于喂食后约1小时采集。该牡蛎体长40毫米，取自水产养殖设施，在饥饿预处理与实验开展前，于LUMCON的常温流水海水系统中暂养。LaPn-4菌株于1999年在路易斯安那州海域分离，其特征描述见于Thessen等人2005年发表的论文《盐度对拟菱形藻属（Bacillariophyceae，硅藻门）生长与分布的影响》，刊载于《Journal of Phycology》（缩写J. Phyc.）第41卷第21-29页。