From what I know all carnivores in the wild get around 45% - 50% protein in what they eat. I also know that at around 20% starch they pass anything past that. Protein builds and replenishes muscle and tissue. Fat and starch or sugar provide energy for growth. Fiber is passed. The protein, fat and fiber numbers add up to 70%. It takes around 15% starch to hold the food together. That puts us at 85%. Lets assume 8% ash which part of it is passed and 7% moisture moisture. This foods net energy gain is off the chart! I am guessing all but about 14% of the food is used by the fish.
Ken I stand corrected. My apologies if I came off as rude.
