I currently have a northern pike (my son foul hooked it and it became a pet since my kids wouldn't let me release it again, was about 5 inches and is now 19 inches)
Also in the tank are a 19.5 inch redtailed catfish and a 9 inch oscar (going by length on them all)
I have been feeding them a variety of wild minnows, frogs, mice, bugs, crayfish and worms.
I keep extra tanks to house all their food as i have found issues myself in the past with goldfish and other store bought feeders.
What i am wondering though is if there is a way to quantify perhaps the best regiment of feeders from my list of self caught stuff that will maybe enhance their nutritional intake? Or is just simply having the variety of different things sufficient enough to maintain a healthy balance for them?