They eat kind of anything, including the algae that forms in your pond. Generally, it's always going to be something less volatile than fertilizer
https://st.exportv.ru/photo/graph-price/1/index-price-food-for-fish-history-2021.jpg
- Cents a lb running average is pretty good. Likely less concentrated in nutrient than pure fertilizer though. Besides I think tilapia is trash, what is the food conversion ratio for them? Also looking into fresh water shrimp, though the breeding looks tricky.
Maybe not the most nutritious but you can trade talapia for chicken, eggs, beef, whatever.
I would go with whatever is easier to farm.
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