The thing about giving fish is that Vitamin E needs to also be given. Fish is a truly great source of some fatty acids. The problem is that certain marine fish and mollusks, if given in large amounts, can cause nutritional steatis (yellow fat disease), a fatal condition if allowed to progress which kills faster in kits than adults, but which is usually correctible. The treatment protocol is given in Fox's _Biology and Diseases of the Ferret_. This is not too common these days but was for a while among some fitch fur farmers (people who raise ferrets as a fur animal), and a few cases that I have discussed with Dr. Jerry Murray have shown up in the last year in ferrets given cheap cat foods. Getting a balanced food is really something that involves a lot of balancing of this and that, and in the cheap foods the makers don't necessarily care... [Posted in FML issue 4919]