I am in the process of Fish Farming to my Organic Farm

Started an Organic Farm in Upstate New York, I have six 16 x 42 greenhouses, and am looking to add a new building for fish farming as well as fresh water shrimp. We have Bass and Catfish in ponds outside. I feed the fish - bugs and produce so they are healthier than the pelleted fed fish. I think I will start with eight 8 by 32 by 4 deep ponds in greenhouse structure, I have Banana Trees that will go into this building also. My Koi have always done better with eating the more natural way. I never understood floating food for bottom feeding koi, one of the Koi I have had for 27 years, shes a big girl. She's not fat she's Big Boned. Does anyone have any advice or comments.