I live in southwest georgia. I grew catfish commercially for awhile so that I could write off digging ponds. We never go more than 2-3 weeks without feeding our fish. For us we have had a cold winter, more freezes than normal. The last time I checked the water temp it was 52F close to the surface. Right now we are feeding about 25%-30% of what we would feed during late spring, summer, and early fall. I fed this past Saturday and the fish fed well, including the catfish. Although catfish will gain little or no weight during the real cold months feeding does help cut down on potential diseases. Early spring is a critcal time for catfish. They are more susceptible to parasites. Supposedly they will consume more sinking feed during cold months. We have never used any. I like to see if they are eating or not.