Hi! I'm in touch with a group thinking about deploying Babylegs in a stream from a bridge or a tr...
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by stevie |
April 28, 2020 17:03 |
Hi! I'm in touch with a group thinking about deploying Babylegs in a stream from a bridge or a tree. How long should it be out there collecting a sample? What are factors we should consider in deciding this length of time?
We usually deploy for half an hour. Anything less than that and its not much of a representative sample. That's in relatively steady flowing water without surface smutz like leaves, algae or debris. You should generally avoid water with a lot of gunk in it because it makes processing the sample nearly impossible. We've also left trawls out for much longer-- 10 hours at one point, but that was in slow, even water where we knew the trawl wouldn't tangle or be investigated by ducks or people. I recommend always keeping an eye on the trawl in case it gets tangled.
Hope that helps.
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