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Magnetic fields produced by subsea high-voltage direct current cables reduce swimming activity of haddock larvae (Melanogrammus aeglefinus)

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Authors not listed · 2022

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Underwater power cables produce magnetic fields that significantly reduce swimming performance in fish larvae, potentially disrupting marine ecosystems.

Plain English Summary

Summary written for general audiences

Researchers exposed haddock fish larvae to magnetic fields similar to those produced by underwater power cables (50-150 µT). The magnetic fields reduced swimming speed by 60% and acceleration by 38% in most larvae. This could affect how young fish disperse and survive in areas near underwater cables.

Why This Matters

This study reveals a concerning reality about our expanding underwater electrical infrastructure. While we've focused heavily on how EMF affects humans, we're now seeing clear evidence that marine life faces significant impacts from the magnetic fields generated by subsea power cables. The 50-150 µT field strengths tested here are well within the range of what these cables actually produce in the ocean. What makes this particularly troubling is that haddock larvae naturally rely on Earth's magnetic field for navigation during their critical dispersal phase. When artificial magnetic fields interfere with this process, reducing swimming performance by 60%, we're potentially disrupting entire fish populations. The selective impact on certain behavioral types could reshape marine ecosystems in ways we're only beginning to understand.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2022). Magnetic fields produced by subsea high-voltage direct current cables reduce swimming activity of haddock larvae (Melanogrammus aeglefinus).
Show BibTeX
@article{magnetic_fields_produced_by_subsea_high_voltage_direct_current_cables_reduce_swimming_activity_of_haddock_larvae_melanogrammus_aeglefinus_ce4338,
  author = {Unknown},
  title = {Magnetic fields produced by subsea high-voltage direct current cables reduce swimming activity of haddock larvae (Melanogrammus aeglefinus)},
  year = {2022},
  doi = {10.1093/pnasnexus/pgac175},
  
}
DOI: 10.1093/pnasnexus/pgac175PubMed: 36714825

Quick Questions About This Study

Yes, magnetic fields from subsea HVDC cables reduced haddock larvae swimming speed by 60% and acceleration by 38%. This occurred at field strengths of 50-150 µT, which matches actual cable output levels in ocean environments.
Haddock larvae naturally use Earth's magnetic field for navigation during dispersal over continental shelves. Artificial magnetic fields from underwater cables can interfere with this natural orientation system, disrupting their movement patterns.
HVDC subsea cables produce magnetic fields in the 50-150 µT range. This study tested larvae at these realistic exposure levels, finding significant behavioral impacts at intensities actually present near operational cables.
No, only non-exploratory larvae (78% of those tested) showed reduced swimming performance. Exploratory larvae (22%) were unaffected, suggesting the impact could selectively alter population dynamics by affecting specific behavioral types.
Yes, the selective impact on non-exploratory individuals could have population-scale implications. Reduced swimming performance during the critical larval dispersal phase may affect survival rates and distribution patterns in wild haddock populations.