Quantifying shark depredation in a recreational fishery in the Ningaloo Marine Park and Exmouth Gulf, Western Australia

Mitchell, J. D.; McLean, Dianne L.; Collin, Shaun P.; Taylor, Stephen M.; Jackson, Gary; Fisher, Rebecca; Langlois, Tim

doi:10.3354/meps12412

Cited by 42 publications

(35 citation statements)

References 67 publications

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“…Our findings show very clear and interesting associations between sandbar sharks and Alabama's Artificial Reef Zone (AARZ), where depredation (i.e., the partial or complete removal of a hooked species by a non-target species) by sandbar sharks is common in hook and line fisheries (Drymon et al, 2019). In Western Australia, depredation by sharks is higher in areas receiving higher fishing pressure, perhaps indicting learned behavior by the sharks (Mitchell et al, 2018), which may also be the case for sandbar sharks inhabiting the AARZ. Although limited, recapture data from four adult sandbar sharks tagged in the AARZ indicates strong site fidelity.…”

Section: Discussionmentioning

confidence: 74%

Defining Sex-Specific Habitat Suitability for a Northern Gulf of Mexico Shark Assemblage

et al. 2020

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Understanding the factors that influence species' distributions is crucial for implementing effective management and conservation practices, yet difficult for highly vagile species like sharks. Many shark species demonstrate either spatial and/or temporal sexual segregation, further confounding accurate quantification of habitat suitability. Given the importance of understanding spatiotemporal patterns in the distribution of coastal shark assemblages, we sought to quantify sex-specific abiotic factors that influence seasonal variation in a coastal shark assemblage using data from a long-term fisheriesindependent bottom longline program in the northern Gulf of Mexico. Catch data (individuals/100 hooks/hour) were coupled with a suite of potentially predictive variables: surface and bottom values for temperature (• C) and salinity (psu), sea surface height (m), three-dimensional surface and bottom current velocity (u, v, w, in m/s), bottom dissolved oxygen (mg/l), depth (m), substrate grain size (mm), daylength (min), and distance from shore (km). Data were analyzed using boosted regression trees (BRT) to describe the relationships between catch data and environmental factors potentially influencing sex-specific species distribution and abundance. Between May 2006 and November 2018, we conducted 1,226 bottom longline sets and caught 13,742 individuals encompassing 67 species. The majority of the animals captured (74%) were elasmobranchs, primarily sharks. Two species from each of the following three categories were selected for further analyses: small coastal sharks (Atlantic sharpnose shark Rhizoprionodon terraenovae and blacknose shark Carcharhinus acronotus), large coastal sharks (blacktip shark C. limbatus and sandbar shark C. plumbeus), and shelfassociated sharks (smoothhound sharks, Mustelus spp. and scalloped hammerhead Sphyrna lewini). Depth and distance from shore were the strongest predictors of distribution and relative abundance, followed by longitude and bottom salinity; other factors (e.g., temperature, daylength, substrate grain size) were less predictive. For the six species examined, predictive factors were often the same for males and females, although the range of preferred values varied. Surprisingly, the importance of these

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Section: Discussionmentioning

confidence: 74%

Defining Sex-Specific Habitat Suitability for a Northern Gulf of Mexico Shark Assemblage

et al. 2020

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“…The areas around Tantabiddi and North Passage are characterised by high probability of dolphin occurrence and have also been identified as part of a core area of very high recreational fishing pressure in NMP 71 . The impact this overlap may have on dolphins is unknown and needs to be assessed.…”

Section: Overallmentioning

confidence: 99%

Identifying priority habitat for conservation and management of Australian humpback dolphins within a marine protected area

Hunt

Allen

Bejder

et al. 2020

Sci Rep

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“…In some cases, when fish are hooked and struggling on the end of the fishing line, they can experience high levels of depredation from opportunistic predators. For example, Mitchell et al (2018) found there was a major spatial component to depredation rates, which appeared to be driven by fishing pressure and learning by the shark predators. Predation can also be a conservation issue for angled fish post-release.…”

Section: Minimizing Biological Impactsmentioning

confidence: 99%

The future of recreational fisheries: Advances in science, monitoring, management, and practice

et al. 2019

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Recreational fisheries (RF) are complex social-ecological systems that play an important role in aquatic environments while generating significant social and economic benefits around the world. The nature of RF is diverse and rapidly evolving, including the participants, their priorities and behaviors, and the related ecological impacts and social and economic benefits. RF can lead to negative ecological impacts, particularly through overexploitation of fish populations and spread of non-native species and genotypes through stocking. Hence, careful management and monitoring of RF is essential to sustain these ecologically and socioeconomically important resources. This special issue on recreational fisheries contains diverse research, syntheses, and perspectives that highlight the advances being made in RF research, monitoring, management, and practice, which we summarize here. Co-management actions are rising, often involving diverse interest groups including government and non-government organizations; applying collaborative management practices can help balance social and economic benefits with conservation targets. Technological and methodological advances are improving the ability to monitor biological, social, and economic dynamics of RF, which underpin the ability to maximize RF benefits through management actions. To ensure RF sustainability, much research focuses on the ecological aspects of RF, as well as the development of management and angling practices that reduce negative impacts on fish populations. For example, angler behavior can be influenced to conform to conservation-minded angling practices through regulations, but is often best accomplished through growing bottom-up social change movements. Anglers can also play an important role in fisheries monitoring and conservation, including providing data on fish abundance and assemblages (i.e., citizen science). The increasing impacts that growing human populations are having on the global environment are threatening many of the natural resources and ecosystem services they provide, including valuable RF. However, with careful development of research initiatives, monitoring and management, sustainable RF can generate positive outcomes for both society and natural ecosystems and help solve allocation conflicts with commercial fisheries and conservation. which ultimately determines the degree of environmental impacts across aquatic landscapes (

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Quantifying shark depredation in a recreational fishery in the Ningaloo Marine Park and Exmouth Gulf, Western Australia

Cited by 42 publications

References 67 publications

Defining Sex-Specific Habitat Suitability for a Northern Gulf of Mexico Shark Assemblage

Defining Sex-Specific Habitat Suitability for a Northern Gulf of Mexico Shark Assemblage

Identifying priority habitat for conservation and management of Australian humpback dolphins within a marine protected area

The future of recreational fisheries: Advances in science, monitoring, management, and practice

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