Hi Benton,
Do you have the ability to grow spirulina? If you add 3% spirulina by weight to your feed, that will get you well over 25% protien. With spirulina being between 40 and 70% protien, it can be beneficial to many types of livestock at 3% by weight. Going over 3% typically doesn't help, but thats depending on species. Definitely research every species application before use. Spirulina can be easy to grow in
aquaculture, using things like worm castings and
wood ash, and it grows fast. So depending on how much you need daily, will depend on the size tank you need to maintain
sustainable daily harvests. Not sure if its a fit, but might be worth checking out.
Hope that helps.