Had the same thing happen to me, was before I discovered Pond Boss. Had a big rain while the pond was being built, and several GSF washed in, along with YBH.

Pond was completed in July of 2022, CC and BG stocked Sept 2022, LMB stocked June 2023 they have been thinned out by the LMB that they didn't eat. LOL Still catching a few but the numbers have decreased significantly.

2 Acre, Completed July 2022, CC,BG, Sept. 2022, LMB June 2023, GSF, YBH invasion in 2022. BG, CNBG, RES, 2025, TP seasonal.