What question did this study set out to answer?

This research aims to characterize the underwater sound environment in Atlantic salmon sea cages and examine operational impacts on fish welfare.

Long-term underwater passive acoustic monitoring of the soundscape in an Atlantic salmon sea cage

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Long-term monitoring evaluates underwater soundscapes in Atlantic salmon farming, suggesting effects on fish welfare.

This research aims to characterize the underwater sound environment in Atlantic salmon sea cages and examine operational impacts on fish welfare.
Hydrophone deployment for passive acoustic recordings inside an open sea cage
Data collection from July to November 2023
Operational activities tracked through logs, AIS data, and time-lapse imagery
Categorization of operational days into normal, net cleaning, and delousing activities
Net cleaning operations produce higher sound pressure levels for frequencies over 200 Hz compared to normal operations
Distinct acoustic signatures identified for net cleaning, delousing, and normal conditions
The 95th percentile of broadband signals during cage cleaning was measured at 150 dB re 1 μPa
Findings suggest net cleaning may induce more acoustic stress in farmed salmon than other routine practices

Jónsdóttir et al. (2026) studied this question.

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