I was recently reminded of the summer I spent working a gold dredge on a remote creek in Michigan’s thumb. For eight hours each day, I knelt in waist-deep water sorting a steady flow of material moving along a two-foot-wide conveyor belt.
I was looking for treasure but not of the golden variety – our team was after an endangered freshwater mussel.
Great Lakes Now
https://www.greatlakesnow.org/2021/07/fish-mussel-memory-endangered-species/