This study in my opinion had an agenda. Soy Meal > Fish Meal. However useful information can usually be gleaned from any study.
Do you have a study that shows that a carnivorous species couldn't utilize starch?
Was the ingredient makeup of each diet reported?
Was the fish meal used whole fish meal? Is whole fish meal ever used in aquaculture?
I did some testing on piscivore's in this area. They consistently used up to 20% starch without passing any.
The 100% protein digestibility of soy meal can't be beat. However the 2% oil/fat needs to be limited because it has the wrong type of fats for fish.
At 92% - 93% digestibility whole fish meal is excellent. However without cutting the fat it could lead to health problems as noted.
