Salmon Acoustic Stress: Noise Pollution in Aquaculture

Farmed salmon are exposed to boat engines, feeding machinery, and underwater noise pollution. Growing evidence suggests acoustic stress contributes to welfare compromise in sea cages.

Key Facts

Salmon have functional hearing across frequencies relevant to boat engines and feeding equipment
Chronic noise exposure elevates cortisol in fish, indicating physiological stress
Aquaculture operations involve constant exposure to motor noise from workboats and feeders
Acoustic deterrent devices used against seals cause stress responses in farmed salmon
Noise reduction through equipment modification and operational protocols is technically feasible
The welfare implications of aquaculture acoustic environment remain under-studied

Welfare Considerations

Acoustic stress in farmed salmon is an emerging welfare concern. Fish are unable to escape noise sources in confined sea cages, meaning chronic exposure to loud machinery is unavoidable. Acoustic deterrent devices aimed at seal predators may cause unintended welfare harm to the fish they protect. Better understanding of the acoustic environment of sea cages and implementation of noise reduction measures would address a welfare dimension currently ignored in most certification standards.

What You Can Do

Support research into acoustic welfare in aquaculture environments
Advocate for acoustic environment assessment to be included in aquaculture welfare audits
Choose aquaculture products from operations demonstrating environmental welfare awareness