In terms of greenhouse gases. Yes. Salmon farming is roughly equal to chicken, better than pork, a lot better than feedlot beef.
Keeping the focus on greenhouse gases, I used to think a “locavore” diet was the way to go to help reduce my carbon footprint. I started shopping more frequently at the local farmers markets for meat, vegetables, cheese and other food products.
Then I came across a study that examined 29 different food products, from beef to nuts, and breaks down how much greenhouse gas emissions each stage in the supply chain is responsible for (e.g., land use change, farm, animal feed, processing, transport, retail and packaging).
Turns out that what you eat is much more important than where your food traveled from.
https://ourworldindata.org/food-choice-vs-eating-local