Salmon and trout feed usually contains a combination of fishmeal, fish oil, and plant-based ingredients. Fishmeal and fish oil are typically derived from small

Salmon and trout feed usually contains a combination of fishmeal, fish oil, and plant-based ingredients. Fishmeal and fish oil are typically derived from small marine fish like anchovies, sardines, or menhaden. IIRC it takes upto 5 kg of fishmeal to produce 1kg of farmed fish. Fish farming has also issues (water pollution, eutrophication, diseases and parasites, feed dependency contributing to overfishing and unsustainable fishing practices, ...). Antibiotic use in fish farms poses threat to humans, study says https://www.aquaculturenorthamerica.com/antibiotic-use-in-fish-farms-poses-threat-to-humans-study-says/ https://www.aquaculturenorthamerica.com/antibiotic-use-in-fi...