The US just lost a trade battle with Mexico

[hunter]

18. The trouble with "farming" carnivorous fish is the feed.

Fish feed is often made from netted wild caught fish and fish guts that humans consider inedible.

Fish ponds built near the ocean destroy coastal habitats, and both pond-raised and net-pen-raised fish are reservoirs of fish diseases and parasites, and, if antibiotics and parasiticides are used favor the evolution of resistant disease organisms. Dense concentrations of fish also pollute the water.

Fish farming can be done with fewer environmental impacts using vegetarian fish species, or possibly carnivorous species fed vegetable and insect proteins, in inland ponds with water inlets carefully designed not to draw up natural water life and with comprehensive treatment of the pond outlet water.

But that's not the way things are done in most of the world. Mangrove forests are ripped up, natural wetlands are diked, and fish or shrimp are fed the least expensive wild-caught fish proteins available. Wastewater from the ponds is dumped directly into the ocean or rivers without treatment.

Seafood farming is an industry that requires heavy regulatory oversight because it's too easy and too profitable to cut corners and do it in a way that's very damaging to the natural environment.