When fishing bites: Understanding angler responses to shark depredation

Casselberry, Grace A.; Markowitz, Ezra M.; Alves, Kelly Poliany de Souza; Russo, Joseph Dello; Skomal, Gregory B.; Danylchuk, Andy J.

doi:10.1016/j.fishres.2021.106174

Cited by 18 publications

(38 citation statements)

References 94 publications

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“…Though populations have likely not returned to historic abundance levels in the Florida Keys (Froeschke et al, 2012; Heithaus, Burkholder, et al, 2007; Tinari & Hammerschlag, 2021; Ward‐Paige et al, 2010), increasing shark populations in conjunction with increased human use of the ocean has the potential to lead to increased human–wildlife conflict and highlights the need to proactively manage human behavior to account for larger predator populations (Carlson et al, 2019). Indeed, within our study area and throughout the state of Florida, some fishing boat captains, guides, and anglers have noted increased conflict with sharks and believe that they are a threat to their catch (Drymon & Scyphers, 2017, Casselberry et al 2022). To reduce predation events of prized game fish, some are calling for altering existing shark species protections and increasing shark bag limits.…”

Section: Discussionmentioning

confidence: 98%

Predator–prey landscapes of large sharks and game fishes in the Florida Keys

Griffin

Casselberry

Lowerre‐Barbieri

et al. 2022

Ecological Applications

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Interspecific interactions can play an essential role in shaping wildlife populations and communities. To date, assessments of interspecific interactions, and more specifically predator-prey dynamics, in aquatic systems over broad spatial and temporal scales (i.e., hundreds of kilometers and multiple years) are rare due to constraints on our abilities to measure effectively at those scales. We applied new methods to identify space-use overlap and potential predation risk to Atlantic tarpon (Megalops atlanticus) and permit (Trachinotus falcatus) from two known predators, great hammerhead (Sphyrna mokarran) and bull (Carcharhinus leucas) sharks, over a 3-year period using acoustic telemetry in the coastal region of the Florida Keys (USA). By examining spatiotemporal overlap, as well as the timing and order of arrival at specific locations compared to random chance, we show that potential predation risk from great hammerhead and bull sharks to Atlantic tarpon and permit are heterogeneous across the Florida Keys. Additionally, we find that predator Lucas P. Griffin and Grace A. Casselberry share co-first authorship and contributed equally to this work.

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Section: Discussionmentioning

confidence: 98%

Predator–prey landscapes of large sharks and game fishes in the Florida Keys

Griffin

Casselberry

Lowerre‐Barbieri

et al. 2022

Ecological Applications

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“…Indeed, it has been hypothesized that human–wildlife conflict with sharks will increase as populations recover (Carlson et al, 2019). The recent focus on depredation in shark fisheries research indicates this is already and increasingly the case in some locations (Drymon & Scyphers, 2017; Casselberry et al, 2022; Hoel, Chin & Lau, 2022).…”

Section: Discussionmentioning

confidence: 99%

‘A human values issue’: Actors, arguments, and regulatory change in the Florida land‐based shark fishery

Wester

Turffs

Shiffman

et al. 2022

Aquatic Conservation

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1. Recreational shark fisheries have been the subject of recent public attention because of the possible impacts on shark populations and conflicts between stakeholders. A casestudy is presented based on discussions that took place in summer 2018 about potential changes to policies regulating recreational land-based shark fishing in Florida. Comments from public meetings and workshops (totalling 15.8 hours) and online comments (1,050) submitted to the Florida Fish and Wildlife Conservation Commission (FWC) were analysed using the lens of actornetwork theory. 3. The case study explores the intersection of conflicting stakeholder interests and types of knowledge, including how stakeholders variously defined the problem of user conflict in a coastal public space, and how they aligned themselves in relation to the problem and to each other. It further illustrates how shifting values and norms can intersect with changing technologies and environmental realities to produce new or increasing conflicts between natural resource user groups.4. This study underlines the importance and potential benefits of regulatory agencies explicitly and transparently engaging with value trade-offs when managing conflicts among users of natural resources.

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“…Shark depredation is not evenly distributed across space and time [ 30 , 31 ]. Mitchell et al [ 30 ] reported substantial spatial variation in depredation rates, with higher depredation in areas that received greater fishing pressure.…”

Section: Discussionmentioning

confidence: 99%

“…Shark depredation, where a shark partially or completely consumes an animal caught by fishing gear before it can be retrieved, occurs in commercial and recreational fisheries worldwide, causing a range of negative biological and economic impacts [ 30 , 31 ]. Shark depredation is a growing source of human-wildlife conflict within the Queensland fishing community.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Catch Rates, Shark Abundance and Depredation Rate at a Spearfishing Competition on the Great Barrier Reef, Australia

Smith

Songcuan

Mitchell

et al. 2022

Biology

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We developed and applied a method to quantify spearfisher effort and catch, shark interactions and shark depredation in a boat-based recreational spearfishing competition in the Great Barrier Reef Marine Park in Queensland. Survey questions were designed to collect targeted quantitative data whilst minimising the survey burden of spearfishers. We provide the first known scientific study of shark depredation during a recreational spearfishing competition and the first scientific study of shark depredation in the Great Barrier Reef region. During the two-day spearfishing competition, nine vessels with a total of 33 spearfishers reported a catch of 144 fish for 115 h of effort (1.25 fish per hour). A subset of the catch comprised nine eligible species under competition rules, of which 47 pelagic fish were weighed. The largest fish captured was a 34.4 kg Sailfish (Istiophorus platypterus). The most common species captured and weighed was Spanish Mackerel (Scomberomorus commerson). The total weight of eligible fish was 332 kg and the average weight of each fish was 7.1 kg. During the two-day event, spearfishers functioned as citizen scientists and counted 358 sharks (115 h effort), averaging 3.11 sharks per hour. Grey Reef Sharks (Carcharhinus amblyrhynchos) comprised 64% of sightings. Nine speared fish were fully depredated by sharks as spearfishers attempted to retrieve their catch, which equates to a depredation rate of 5.9%. The depredated fish included four pelagic fish and five reef fish. The shark species responsible were Grey Reef Shark (C. amblyrhynchos) (66%), Bull Shark (Carcharhinus leucas) (11%), Whitetip Reef Shark (Triaenodon obesus) (11%) and Great Hammerhead (Sphyrna mokarran) (11%). There were spatial differences in fish catch, shark sightings and rates of depredation. We developed a report card that compared average catch of fish, sightings of sharks per hour and depredation rate by survey area, which assists recreational fishers and marine park managers to assess spatio-temporal changes. The participating spearfishers can be regarded as experienced (average 18 days a year for average 13.4 years). Sixty percent of interviewees perceived that shark numbers have increased in the past 10 years, 33% indicated no change and 7% indicated shark numbers had decreased. Total fuel use of all vessels was 2819 L and was equivalent to 6.48 tons of greenhouse gas emissions for the competition.

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When fishing bites: Understanding angler responses to shark depredation

Cited by 18 publications

References 94 publications

Predator–prey landscapes of large sharks and game fishes in the Florida Keys

Predator–prey landscapes of large sharks and game fishes in the Florida Keys

‘A human values issue’: Actors, arguments, and regulatory change in the Florida land‐based shark fishery

Quantifying Catch Rates, Shark Abundance and Depredation Rate at a Spearfishing Competition on the Great Barrier Reef, Australia

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