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Journal article
Stress physiology of scalloped and great hammerhead sharks from a bottom longline fishery
Conservation physiology, Vol.13(1), coaf015
2025
Abstract
The scalloped hammerhead Sphyrna lewini and the great hammerhead S. mokarran are large, coastal to semi-oceanic shark species common to waters of the US east coast where they are regularly taken in commercial and recreational fisheries, particularly the bottom longline fishery. High rates of hooking mortality and low rates of population growth are believed to have caused severe declines in the US Atlantic populations of these species. The objective of this study was to determine the physiological stress induced by bottom longline capture in both S. lewini and S. mokarran. Physiological stress was quantified using the blood biochemical indicators glucose, lactate, pH, haematocrit, sodium, potassium, calcium, chloride and magnesium, which have been demonstrated to indicate physiological stress in elasmobranchs. Each shark captured was assigned a condition factor, which was compared with the stress parameters and time on hook to quantify stress induced by different longline hook times. In S. lewini, the physiological stress parameters lactate, pH, sodium and chloride scaled with hook time, whereas in S. mokarran, only lactate was affected by hook time. In both species, water temperature affected lactate and glucose levels, as well as sodium and pH levels in S. lewini and magnesium levels in S. mokarran. These data will be useful for estimating post-release mortality of S. lewini and S. mokarran from measurements taken at the time of capture, and quantifying the physiological stress response to longline capture in both species to the Atlantic bottom longline fishery.
Details
- Title
- Stress physiology of scalloped and great hammerhead sharks from a bottom longline fishery
- Authors/Creators
- Bianca K Prohaska - NOAA National Marine Fisheries ServiceHeather Marshall - Everglades UniversityR Dean Grubbs - Florida State UniversityKarissa Lear - Murdoch University, Centre for Sustainable Aquatic EcosystemsBryan S Frazier - South Carolina Department of Natural ResourcesJohn J MorrisAlyssa Andres - Florida State UniversityRobert E Hueter - Mote Marine LaboratoryBryan A Keller - NOAA National Marine Fisheries ServiceNicholas M Whitney - New England Aquarium
- Publication Details
- Conservation physiology, Vol.13(1), coaf015
- Publisher
- Oxford University Press and the Society for Experimental Biology.
- Number of pages
- 13
- Grant note
- NOAA Office of Protected ResourcesNOAA
We thank the collaborating commercial captains (Dave Campo, Jim Bonnell, Randy Lauser and Luke Hill) and their first mates. We thank the many graduate students and volunteers that assisted in the FSU surveys and many interns and staff at Mote Marine Laboratory. For analysis of ions and metabolites, we thank Diego Bernal (the University of Massachusetts Dartmouth) for the use of the CCX and Charles Innis, Deana Edmunds and Kerry McNally (New England Aquarium) for use of their pHOx benchtop analyser. Reference to trade names does not imply endorsement by the National Marine Fisheries Service, NOAA.
- Identifiers
- 991005752728107891
- Copyright
- © The Author(s) 2025.
- Murdoch Affiliation
- Centre for Sustainable Aquatic Ecosystems
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.2 Marine Biology
- 3.2.92 Fisheries Ecology
- Web Of Science research areas
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- Ecology
- Environmental Sciences
- Physiology
- ESI research areas
- Environment/Ecology