G. portentosa: Feed mass per roach per week? in Food and Feeding Posted November 2 Hello! I would also say some hissers eat more or less than others. They have individual personalities believe it or not and some are heavier eaters than others so it might be hard to get exact numbers. That's probably why the results aren't readily available. I'd recommend doing it on a colony by colony basis and get to know what your roaches eat. I have different hisser colonies and some clear more food. Hissers also don't eat as much as one would think for their size. I find my E. Serranus are extremely food motivated but my common hissers aren't so much and don't clear the same amount of food as, say, dubia. Wish I could give exact information but each colony is different so you might have to experiment with your individual colonies. Hope this helps!