My uneducated guess: Weed & algae growth took up much of the fertility. Water cleared, leading to more weed growth.
Additional weeds made it harder for bass to find BG, so growth rates declined. Smaller bass began to dominate. Average BG sizes declined as well, as LMB could not aggressively crop the YOY.
Not sure about watershed. If acidic as mine, and no liming, fish biomass would suffer as weeds took up more fertility.
7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160
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