i want formula for produce trout nutrition with by product of slaughterings?

Question

i want formula of that

Answer 1

there is a dry nutritional meal made with the left-overs from the slaughterhouse ... the dry meal is protein rich and is fed to trout in trout farms. you don't throw it in fresh-cooked ... the drying process gives the meal a longer shelf-life.

Answer 2

just cook the slaughterings then grind them up and toss them in to the trout.