Stress response and postrelease mortality of blacktip sharks (Carcharhinus limbatus) captured in shore-based and charter-boat-based recreational fisheries

Weber, D. Nick; Frazier, Bryan S.; Whitney, Nicholas M.; Gelsleichter, James; Sancho, Gorka

doi:10.7755/fb.118.3.8

Cited by 12 publications

(17 citation statements)

References 31 publications

(100 reference statements)

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“…The estimate of 26% PRM reported for bull sharks on drumline gear in the NW Atlantic (n = 27 [ 39 ]) is over three times as high as our study, although this previous estimate was based on reporting rates of fin-mounted satellite tags and may overestimate mortality if tag failure or shark behavior prevent satellite transmissions. In blacktip sharks, PRM rates have previously been estimated at 9–23% in recreational fisheries [ 17 , 27 , 44 ], and we found substantially higher PRM for this species in the BLL fishery.…”

Section: Discussionsupporting

confidence: 59%

“…Blacktip sharks are the second most commonly caught species in this fishery [ 50 ] and, based on their blood stress values, are thought to be more susceptible to post-release mortality than other species [ 37 , 39 , 40 ]. Several recent studies have examined their PRM in recreational fisheries [ 17 , 27 , 44 , 45 , 51 ] but none have done so in a BLL fishery. Tiger, bull, and spinner sharks have not been the subject of recent population assessments in the region but, together with sandbar and blacktip, make up five of the seven most commonly caught sharks in the large coastal shark fishery in the Atlantic region [ 50 ].…”

Section: Introductionmentioning

confidence: 99%

“…Most recent shark PRM studies have used either acoustic [e.g. [15][16][17] or satellite archival tags (PSATs; [e.g. [18][19][20][21][22][23][24][25]) to assess mortality.…”

Section: Introductionmentioning

confidence: 99%

“…9, [34][35][36][37][38][39][40][41][42], most blood studies have not linked their results directly to animal mortality. Only a handful of studies have directly compared blood parameters with post-release fate in sharks [9,16,17,[26][27][28]38,43,44], and these have often investigated recreational fisheries with short fight durations, had relatively small sample sizes, and recorded few mortalities. Overall, blood stress values remain disconnected to empirical post-release fate, and this has limited the value of at-vessel blood stress metrics for estimating mortality.…”

Section: Introductionmentioning

confidence: 99%

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Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery

et al. 2021

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Bycatch mortality is a major factor contributing to shark population declines. Post-release mortality (PRM) is particularly difficult to quantify, limiting the accuracy of stock assessments. We paired blood-stress physiology with animal-borne accelerometers to quantify PRM rates of sharks caught in a commercial bottom longline fishery. Blood was sampled from the same individuals that were tagged, providing direct correlation between stress physiology and animal fate for sandbar (Carcharhinus plumbeus, N = 130), blacktip (C. limbatus, N = 105), tiger (Galeocerdo cuvier, N = 52), spinner (C. brevipinna, N = 14), and bull sharks (C. leucas, N = 14). PRM rates ranged from 2% and 3% PRM in tiger and sandbar sharks to 42% and 71% PRM in blacktip and spinner sharks, respectively. Decision trees based on blood values predicted mortality with >67% accuracy in blacktip and spinner sharks, and >99% accuracy in sandbar sharks. Ninety percent of PRM occurred within 5 h after release and 59% within 2 h. Blood physiology indicated that PRM was primarily associated with acidosis and increases in plasma potassium levels. Total fishing mortality reached 62% for blacktip and 89% for spinner sharks, which may be under-estimates given that some soak times were shortened to focus on PRM. Our findings suggest that no-take regulations may be beneficial for sandbar, tiger, and bull sharks, but less effective for more susceptible species such as blacktip and spinner sharks.

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Section: Discussionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

“…Most recent shark PRM studies have used either acoustic [e.g. [15][16][17] or satellite archival tags (PSATs; [e.g. [18][19][20][21][22][23][24][25]) to assess mortality.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery

et al. 2021

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“…This shore-or land-based shark fishing is a subsection of the recreational shark fishing sector and occurs around the globe, including in South Africa (Dicken et al 2006), Australia (Griffiths 2012), Argentina (Cuevas 2015), and Europe (authors, personal observations). In the United States, active shore-based shark fishing has been observed in several states, including California, Texas, the Carolinas, and finally, Florida (e.g., Kilfoil et al 2017;Shiffman et al 2017;Gibson et al 2019;Weber et al 2020). Compared to boat-based fisheries, shore-based shark fishing has a low barrier for entry given the ease of access and low cost of fishing from shore.…”

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confidence: 99%

Survey‐Derived Angler Characteristics and Perspectives in the Shore‐Based Shark Fishery in Florida

et al. 2021

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Shore-based shark fishing in Florida is rarely monitored as it largely occurs at night on remote beaches and has received a questionable reputation after recent exposure of illegal activity. While these events have led to calls for better management and enforcement, the characteristics of the fishery itself remain largely unknown. Our study, therefore, provides the first comprehensive profile of the Florida shore-based shark fishery to inform fisheries management and conservation. We distributed an online survey to all Florida Fish and Wildlife shore-based shark fishing permit holders to gather data on angler sociodemographics, fishing preferences, habits, motivations, and perceptions of shark conservation. We identified three angler typologies that differed primarily by shark fishing experience and frequency: (1) experienced infrequent anglers, (2) skilled frequent anglers, and (3) novice infrequent anglers. Our results revealed that the Florida recreational shore-based shark fishery itself has increased in participation fivefold since 2010 and generates approximately US$7.8 million (95% CI = $7.2-8.5 million) annually in equipment expenditures and $34.3 million ($30.4-38.1 million) annually in fishing trips. Surveyed anglers caught a total of 9,617 sharks within a 12-month period, averaging 11 sharks/angler, and the most preferred target species was the Blacktip Shark Carcharhinus limbatus. Angler motivations for participating in this fishery were grouped into the following categories: leisure and well-being, experience of the catch, and consumption. Perceptions of shark conservation and management were generally positive; however, many anglers did not believe that recreational fishing negatively impacts shark populations. Most anglers expressed a desire to learn more about handling practices that benefited sharks, which may help managers implement more educational opportunities and communication efforts. Understanding the characteristics and perspectives of anglers from the shore-based shark fishery in Florida is crucial for highlighting potential management pathways and estimating angler acceptance of management.

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Post-release mortality, recovery, and stress physiology of blacknose sharks, Carcharhinus acronotus, in the Southeast U.S. recreational shark fishery

Knotek

Frazier²,

Daly-Engel³

et al. 2022

Fisheries Research

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Stress response and postrelease mortality of blacktip sharks (Carcharhinus limbatus) captured in shore-based and charter-boat-based recreational fisheries

Cited by 12 publications

References 31 publications

Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery

Connecting post-release mortality to the physiological stress response of large coastal sharks in a commercial longline fishery

Survey‐Derived Angler Characteristics and Perspectives in the Shore‐Based Shark Fishery in Florida

Post-release mortality, recovery, and stress physiology of blacknose sharks, Carcharhinus acronotus, in the Southeast U.S. recreational shark fishery

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