Deep-Sea Trawling and Fish Welfare: The Hidden Cost

Bottom trawling is one of the most ecologically destructive fishing methods, also causing significant welfare harms to millions of fish and invertebrates annually.

Key Facts

Bottom trawling affects an estimated 4.9 million square kilometers of ocean floor annually
Fish caught in bottom trawls experience barotrauma as they are rapidly brought to the surface
Decompression injury in rapidly surfacing fish causes extreme physiological stress and organ damage
Trawl hauls can take 2-4 hours before sorting, during which fish may suffer prolonged distress
Invertebrates including crabs, starfish, and sponges are caught as bycatch in enormous numbers
Some nations have banned bottom trawling in protected areas, reducing both ecological and welfare harm

Welfare Considerations

Bottom trawling welfare harms are compounded by ecological destruction - the same gear that destroys seafloor habitats also causes severe suffering to the fish caught. Barotrauma from rapid pressure changes causes internal organ damage, swim bladder rupture, and eye extrusion in fish brought from depth. Fish may survive this physiological trauma only to die slowly on deck. The welfare case against bottom trawling reinforces the conservation and environmental case, yet it remains a dominant global fishing method. Consumer choices and policy advocacy are the primary levers available for change.

What You Can Do

Avoid seafood products caught using bottom trawl methods - check certification labels
Support campaigns for expanded bottom trawl bans in protected marine areas
Advocate for fishing gear transition programs that help fishers adopt lower-impact methods
Choose MSC-certified seafood from fisheries that exclude bottom trawling
Donate to marine conservation organizations working on fishing method reform