I mainly feed catfish "nuggets," because they're $1.76/lb at walmart most of the time. I would think that a 12" pbass might eat around 1lb per week maybe a little less, but as cg said, he won't be 12" for long and he will be continuously needing more food. My biggest pbass, about 18" can eat about 1/4lb in one sittind I would guess. If I fed him multiple times a day I would think he could double that.