Could be thermal shock from recent cold, especially if the fish was shallow spawner when cold hit. In 2017 I lost hundreds of my larger CNBG after sharp cold October snap. Keep a lookout for this, I think some here have recommended treating feed with antibiotic.

Last edited by anthropic; 11/08/21 05:40 PM.
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