Bill D. RW is only 1 tool. While a very good tool it does have its deficiencies and only tells part of the story. Regional differences are large in national RW schedules. Also they are almost exclusively from wild fish , not pond fish. There are other condition factors which help in the fact finding. BG (and most pond fish)have an entirely different biochemistry/metabolic structure to land based animals (BG do not metabolize carbs and their lipid structure is completely different). One pond fish that does metabolize carbs and can get obese are HSB.