DAO 127:83-95 (2018)  -  DOI: https://doi.org/10.3354/dao03189

Discrimination between bycatch and other causes of cetacean and pinniped stranding

Yara Bernaldo de Quirós1,2, Meghan Hartwick1,3, David S. Rotstein4, Michael M. Garner5, Andrea Bogomolni1, William Greer6,7, Misty E. Niemeyer3, Greg Early7, Frederick Wenzel6, Michael Moore1,*

1Woods Hole Oceanographic Institution, Biology Department, Woods Hole, Massachusetts 02543, USA
2Institute of Animal Health, University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
3International Fund for Animal Welfare, Yarmouth Port, Massachusetts 02543, USA
4Marine Pathology Services, Olney, Maryland 20832, USA
5NW ZooPath, 654 W Main St, Monroe, Washington 98272, USA
6NOAA NMFS Northeast Fisheries Science Center, Woods Hole, Massachusetts 02543, USA
7Integrated Statistics, Woods Hole, Massachusetts 02543, USA
*Corresponding author:

ABSTRACT: The challenge of identifying cause of death in discarded bycaught marine mammals stems from a combination of the non-specific nature of the lesions of drowning, the complex physiologic adaptations unique to breath-holding marine mammals, lack of case histories, and the diverse nature of fishing gear. While no pathognomonic lesions are recognized, signs of acute external entanglement, bulging or reddened eyes, recently ingested gastric contents, pulmonary changes, and decompression-associated gas bubbles have been identified in the condition of peracute underwater entrapment (PUE) syndrome in previous studies of marine mammals. We reviewed the gross necropsy and histopathology reports of 36 cetaceans and pinnipeds including 20 directly observed bycaught and 16 live stranded animals that were euthanized between 2005 and 2011 for lesions consistent with PUE. We identified 5 criteria which present at significantly higher rates in bycaught marine mammals: external signs of acute entanglement, red or bulging eyes, recently ingested gastric contents, multi-organ congestion, and disseminated gas bubbles detected grossly during the necropsy and histologically. In contrast, froth in the trachea or primary bronchi, and lung changes (i.e. wet, heavy, froth, edema, congestion, and hemorrhage) were poor indicators of PUE. This is the first study that provides insight into the different published parameters for PUE in bycatch. For regions frequently confronted by stranded marine mammals with non-specific lesions, this could potentially aid in the investigation and quantification of marine fisheries interactions.


KEY WORDS: Bycatch · Gas bubbles · Stranding · Cetacean · Pinniped · Fishery · Peracute underwater entrapment


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Cite this article as: Bernaldo de Quirós Y, Hartwick M, Rotstein DS, Garner MM and others (2018) Discrimination between bycatch and other causes of cetacean and pinniped stranding. Dis Aquat Org 127:83-95. https://doi.org/10.3354/dao03189

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