Frank,

There is around 44% more dry matter in RBT than a equal wet weight of BG. RBT are more energy dense. Open the post below and look at the Excel SS on the specific consumption tab. The energy densities in joules per gram wet weight are in the Joules/g. I will mention for common pond fish Centrarchids are not particularly energy dense. Esox are the only group I know of that are less.

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=40731&Number=529114#Post529114