I have issues with a GBH as well. He's got the timing down with the feeders, haven't seen him feed except when they go off and fish are abundant and unwary.

A fence should work, as GBH won't land in the water. They insist on walking from land into shallows, so a physical barrier to this will complicate their life. Also, steep shorelines help.

If you have a feeder, try to place it where the pellets fall into deep water and are pushed away from shore by prevailing winds. The GBH never tries his luck from the dock feeder, as it is over deeper water.

Some have had luck with GBH replicas (they are highly territorial) or even fake gators, but eventually they wise up.

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