A friend once asked me how catfishes were able to cope with single type of feed/diet for a whole season. Yes, they cope because they have no alternative. If you allow them to choose from a wide variety of feed, you will be surprised to see that some of them prefer unconventional feeds.
Unconventional feeds for catfish are most time waste from their point of origin and can be used as an alternative diet for your fishes. Some of these supplementary feed complement your pellet well and make your fishes to perform excellently when rightly used. Ask those who operate an integrated farm how they have been able to cut down the cost of their feed without compromising the quality. They will tell you that it has been through the use of waste from one point as an input in another point.