How many clams are needed? Where do you get them?
If the water quality is normal, the clams open and close randomly.
If all 8 clams close, something is off with the water and prompts more investigation.
They get the clams from a nearby lake, and somewhat comfortingly, they retire them back to the lake when they've done a tour of duty. They're even marked so they don't reuse the same clams!
Nice to hear that they don't just euthanize them even if they are just clams. Guess I'm getting soft in my old age
> We have three measuring devices in the company and eight clams in each. In total, we “employ” 200 individuals during the year.
This other article[1] says they get them from a lake, and are returned to the same lake after three months. They are marked so the scientists won’t pick up the same clam twice.
1: https://www.boredpanda.com/clams-measure-water-quality-polan...