A Lake Census casts the widest net. Species Watch does the opposite: it looks for the DNA of one named species, using a targeted qPCR assay designed for that species alone. Narrowing the question is what makes it more sensitive — it can pick up a species at levels a broad survey is likely to miss.
That makes it the tool for the moment that matters most in invasive-species management: the early window, when a species has arrived but is still rare, localized, and invisible. Found then, it can sometimes still be removed. Found later, it usually can't.
Choose the target from your watch list — the invasives already established in nearby and connected waters — and sample where they would arrive: the boat launch and the main inlet. Collection uses the same syringe-and-filter kit as the Lake Census, roughly five minutes per sample, shipped at room temperature.
Every result goes into your lake's record, including non-detections. A documented, repeated non-detection at your launch is real evidence, and it is the baseline an arrival is measured against.
One of four genetic tests. “Census” reads the whole community; “Watch” looks for one named species. Lake Census and Species Watch read DNA; the two “Live” tests read RNA, which only living, active organisms produce.
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Lake Census — DNA, broad: what lives here?
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Species Watch — DNA, one species: is it here yet?
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Live Census — RNA, broad: what is alive and active right now?
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Live Watch — RNA, one species: is it alive and active here now?
Most lakes should start broad and narrow down: census first, then watch, then confirm. Which genetic test should your lake start with?
Note on methodology: eDNA analysis is not an EPA-approved method. It is a survey and screening tool, and results are not suitable for regulatory or compliance use.