JW :

LMB , BG and CC do not eat much in winter as there metabolism slows way down as water temps drop below 10 C (50 F). The YP will be more active as they are not warmwater fish. While this is a stress factor it is natural. If the places they stay get super cooled due to mixing from aeration that is a different matter. Are you aerating in deep water? If so you should consider moving it to shallow water in winter. Do a temp analysis next fall and winter and see what your water temps are at all depths.