The technique of assessing the relative abundance of different organisms is one of the strengths of next generation sequencing. For one recent project, we assessed the relative abundance of different fish species across a number of streams in Nebraska by amplifying a region of the mitochondria that is more or less specific to fish. When the percentage data are aggregated, you get a graph something like below. We still have some more work to do to see how well the relative abundance of different fish species is represented by the data below, but the technique identifies a number of the more prevalent taxa found in the streams. We should be introducing a new product for fish eDNA pretty soon as we work out the final details. Stay tuned.