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Related Experiment Video

Updated: May 27, 2026

Lethality Bioassay Using Artemia salina L.
09:09

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Published on: October 11, 2022

Lethal entanglement in baleen whales.

Rachel M Cassoff1, Kathleen M Moore, William A McLellan

  • 1University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania 19104, USA.

Diseases of Aquatic Organisms
|December 3, 2011
PubMed
Summary

Fishing gear entanglement causes baleen whale mortality through drowning, starvation, infection, and severe injuries. Understanding these lethal scenarios is crucial for developing effective whale conservation and welfare mitigation strategies.

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Area of Science:

  • Marine Biology
  • Conservation Science
  • Wildlife Pathology

Background:

  • Fishing gear entanglement is a significant threat to large whale populations.
  • Understanding the mechanisms of entanglement-induced mortality is vital for conservation efforts.

Purpose of the Study:

  • To identify and describe the lethal scenarios of fishing gear entanglement in baleen whales.
  • To provide data for developing effective mitigation strategies.

Main Methods:

  • Analysis of 21 cases of baleen whale entanglement in the NW Atlantic.
  • Review of sighting histories and necropsy observations.
  • Data analysis to determine causes of mortality.

Main Results:

  • Acute mortality primarily caused by drowning due to inability to surface.
  • Chronic mortality linked to impaired foraging, starvation, infection, and severe hemorrhage or debilitation.
  • Examples of severe injuries include vascular laceration, narial occlusion, and bone embedding.

Conclusions:

  • Fishing gear entanglement poses a severe threat to baleen whale conservation and individual welfare.
  • Lethal entanglement outcomes range from acute drowning to protracted physiological failure.
  • Further research and mitigation are needed to reduce whale entanglement incidents.