Preliminary estimate of post-release survival of immature porbeagles caught with rod-and-reel in the Northwest Atlantic Ocean

Anderson, Brooke N.; Bowlby, Heather D.; Natanson, Lisa J.; Coelho, Rui; Cortés, Enric; Domingo, Andrés; Sulikowski, James A.

doi:10.3354/meps13603

Cited by 5 publications

(2 citation statements)

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“…For sharks that survive capture and tagging, electronic tags can evaluate swimming performance metrics that may be related to behavioral changes following release. Irregular dive behavior consists of inconsistent or restricted depth use [ 33 – 35 ], increased tailbeat frequencies and elevated overall dynamic body acceleration (ODBA) [ 28 ], and reduced frequency and amplitude of dives resulting in a diminished dive variance [ 36 , 37 ]. Quantifying these changes over time allows for a recovery period to be estimated as the amount of time it takes for an individual to restore normal values for these swimming performance metrics.…”

Section: Methodsmentioning

confidence: 99%

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Variable post-release mortality in common shark species captured in Texas shore-based recreational fisheries

et al. 2023

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The practice of catch and release fishing is common among anglers but has been shown to cause unintended mortalities in some species. Current post-release mortality estimates used in coastal shark stock assessments are typically derived from boat-based shark fisheries, which differ from shore-based operations that expose sharks to potentially more stressful environmental and handling conditions. Recreational post-release mortality rates in shore-based fisheries must be quantified to improve stock assessment models and to create guidelines that protect species from overexploitation. Here, we partnered with experienced anglers acting as citizen scientists to deploy pop-up satellite archival transmitting tags (PSAT, n = 22) and acceleration data loggers (ADLs, n = 22). on four commonly caught sharks including the blacktip shark (Carcharhinus limbatus, n = 11), bull shark (Carcharhinus leucas, n = 14), tiger shark (Galeocerdo cuvier, n = 6), and great hammerheads (Sphyrna mokarran, n = 2). Mortality occurred within minutes to hours post-release. If evidence of mortality occurred after normal diving behavior had been re-established for 10 days, then the mortality was considered natural and not related to the catch-and-release process. Post-release mortality estimates ranged from 0% for bull and tiger sharks to 45.5% for blacktip sharks. Of the two great hammerheads, one died within 30 minutes post-release while the other exhibited mortality characteristics 14 days after release. Moribund blacktip sharks experienced on average 3.4–4.9°C warmer water compared with survivors. Recovery periods were estimated for survivors of each species and were highly variable, differing based on duration of tag deployment. High variability in responses to capture and release between species demonstrates the need for species-specific assessments of post-release mortality in shore-based recreational fisheries.

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Section: Methodsmentioning

confidence: 99%

“…Dive variance was explored using the depth data for ADL and PSAT-tagged sharks that survived using a break-point analysis [ 39 ] as previously described for recovery analysis in pelagic sharks [ 36 , 37 ]. Unrecovered tags provided low-resolution data and thus were not included.…”

Section: Methodsmentioning

confidence: 99%