I've fished several local ponds and it's common to catch fish with the yellow grubs in their fins.
From what I've read, the best way to combat them is with RES. Eliminate the source (I think it's snails, but also have certain species of birds that frequent the pond and are also known as a common source.)
Any advise is appreciated.
2 Acre, Completed July 2022, CC,BG, Sept. 2022, LMB June 2023, GSF, YBH invasion in 2022. BG, CNBG, RES, 2025, TP seasonal.