Is farmed salmon more sustainable than wild salmon?

It avoids pressure on wild salmon runs but adds sea-lice loads, escapes that interbreed with wild populations, and a feed chain drawn from wild forage fisheries. Certification schemes differ sharply in how strictly they address those.

What are the plant-based alternatives to fish?

Algae oil supplies the same DHA and EPA that fish get from algae in the first place, and legume- or konjac-based products now cover most culinary fish formats.

Animals

Wild-caught fish vs farmed fish

Neither seafood system is the clean option the other's marketing suggests. Wild fishing carries bycatch and stock-collapse risk; aquaculture carries disease, escapes, and a feed chain that still pulls wild fish out of the ocean. This comparison lays out both honestly.

Side by side

Wild-caught fish compared with Farmed fish
Criterion	Wild-caught fish	Farmed fish
Bycatch	Non-target species — dolphins, turtles, sharks, seabirds — are caught and discarded in significant volumes by several gear types.	No direct bycatch, but feed fisheries generate their own.
Habitat	Bottom trawling physically flattens seabed habitat.	Coastal pens concentrate waste, antibiotics and parasites in enclosed waters.
Feed	No feed input.	Carnivorous species require wild-caught forage fish, so farming does not fully decouple from ocean extraction.
Welfare	Death by asphyxiation or decompression; no stunning standards in most fisheries.	Crowding, sea-lice infestation and mass mortality events are routine; slaughter methods vary widely.
Contaminants	Mercury accumulates in large predatory species.	Depends on feed sourcing and pen conditions.

Questions people ask

Is farmed salmon more sustainable than wild salmon?: It avoids pressure on wild salmon runs but adds sea-lice loads, escapes that interbreed with wild populations, and a feed chain drawn from wild forage fisheries. Certification schemes differ sharply in how strictly they address those.
What are the plant-based alternatives to fish?: Algae oil supplies the same DHA and EPA that fish get from algae in the first place, and legume- or konjac-based products now cover most culinary fish formats.

Our reporting on this

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