Evaluating catch and mitigating risk in a multispecies, tropical, inshore shark fishery within the Great Barrier Reef World Heritage Area

Harry, Alastair V.; Tobin, Andrew J.; Simpfendorfer, Colin A.; Welch, David J.; Mapleston, Amos; White, Jimmy; Williams, Ashley J.; Stapley, Jason

doi:10.1071/mf10155

Cited by 71 publications

(82 citation statements)

References 41 publications

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“…The disparity in the number of NSW tagged sharks that moved to the GBR compared to GBR tagged sharks that moved to NSW, suggest that the GBR region supports individuals from many parts of the east coast. Bull sharks have been reported from many systems in NSW and QLD (e.g., Harry et al, 2011;Werry et al, 2011), and the adults from all of these areas may spend time on the GBR. The current study was not intended to identify the role that the GBR plays in the ecology of C. leucas, but given the well-known role of rivers and estuaries as nursery areas for this species, and the size of the animals utilizing the GBR, it is likely that it may be an important foraging ground for adults.…”

Section: Discussionmentioning

confidence: 99%

“…Catches in NSW commercial fisheries occur mostly in the Ocean Trap and Line Fishery where a longline fishery has targeted large sharks (Macbeth et al, 2009). Queensland commercial fisheries mostly take juvenile bull sharks in an inshore gillnet fishery that operates in estuarine areas (Harry et al, 2011). Both states have recreational fishing regulations that limit take to one bull shark per day, and in QLD only sharks less than 1.5 m can be taken.…”

Section: Marine Sciencementioning

confidence: 99%

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Conservation challenges of sharks with continental scale migrations

et al. 2015

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Understanding movement and connectivity of populations is increasingly important as human and climate change pressures become more pervasive, but can be problematic in difficult to observe species such as large marine predators. We examined the movements of bull sharks, Carcharhinus leucas, using acoustic telemetry arrays along the east coast of Australia. Approximately half of 75 individuals released in temperate waters moved into tropical reef regions, with both sexes undertaking long-range movements and multiple individuals making return trips. Only 3% of 39 individuals released in tropical reef habitats moved south to temperate waters, but approximately 25% moved to southern reef or subtropical coastal areas. These results reveal complex linkages along the east coast of Australia which suggest a tropical reef based population comprised of individuals that migrate to multiple regions. Connectivity between locations along the east coast of Australia creates important conservation challenges for resource managers in multiple jurisdictions.

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Section: Discussionmentioning

confidence: 99%

Section: Marine Sciencementioning

confidence: 99%

Conservation challenges of sharks with continental scale migrations

et al. 2015

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“…The lack of knowledge about coastal and inshore fishing compromises national-level management of shark resources, and demonstrates the need for research such as biodiversity surveys and population size estimates through catch surveys, life-history studies, and ecological risk assessments (Stobutzki et al 2001;Harry et al 2011). Without detailed studies such as these, it is uncertain how well global IUCN Red List assessments reflect the status of Solomon Islands elasmobranch populations, and complicates efforts to plan and prioritise further management.…”

Section: Discussionmentioning

confidence: 99%

The sharks and rays of the Solomon Islands: a synthesis of their biological diversity, values and conservation status

Hylton

White

Chin

2017

Pac. Conserv. Biol.

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Abstract. Sharks and rays are facing increasing anthropogenic pressure globally, including in the Pacific. However, data on their status and biodiversity are lacking for many Pacific Large Ocean Island States. This study aimed to construct a species checklist for the sharks and rays occurring in the Solomon Islands, review the human interactions with these species, and present a synthesis of their conservation status. Given the paucity of available data, a wide range of data sources were used including fisheries data, citizen science, and ethnobiological studies. Results were validated through a review process involving expert informants. Fifty sharks and rays were identified from the Solomon Islands, of which 20 are assessed as Vulnerable or Endangered on the IUCN Red List, 10 in the Convention on International Trade in Endangered Species, and 11 in the Convention for Migratory Species. The checklist also presents an eastwards range extension for the Endangered dwarf sawfish Pristis clavata. Fishing appears to be the main impact, though impacts from habitat loss and degradation are possible. This study provides a systematic synthesis and review of the biological diversity, uses, and cultural significance of Solomon Islands sharks and rays, and describes a process for assembling species checklists and reviews in data-poor contexts. However, this synthesis is based on limited information and a complete assessment of shark and ray status in the Solomon Islands will require primary fieldwork.

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“…Catch rates have steadily declined, as has the number of boats operating in the fishery (Chen 1996). No target fisheries exist for shark-like batoids in Australian waters; however, rhinobatids, rhynchobatids, rhinids and pristids are caught in trawl and gillnet fisheries (Stobutzki et al 2002, Zhou & Griffiths 2008, Harry et al 2011. It is unlikely that these species would become targeted in Australian waters given current regulations.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

“…Data were grouped spatially into 2 nominal habitats (intertidal and in shore coastal) that correspond to discrete subcomponents of the ECIFF, each with different target species, fishing practices and management strategies (Harry et al 2011). Within intertidal habitats (< 2 m depth) an array of teleosts (Lates calcarifer, Eleu the ro nema tetradactylum, Polydactylus macrochir) are targeted using gillnets of stretched mesh sizes of 114 to 216 mm and lengths up to 600 m. Fishing in intertidal habitats occurs throughout the day/night and throughout the year.…”

Section: Fishery-dependent Samplingmentioning

confidence: 99%

Shark-like batoids in Pacific fisheries: prevalence and conservation concerns

White

Heupel²,

Simpfendorfer³

et al. 2013

Endang. Species. Res.

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Shark-like batoids are a group of elasmobranchs with a body form similar to that of sharks (i.e. elongate body, well developed caudal and dorsal fins, and head, gill and mouth morphology similar to that of skates and sting rays). Despite a poor understanding of their biology, ecology and resilience to fishing, shark-like batoids are known to have been heavily exploited throughout the Indo-Pacific. Between 2007 and 2009, we recorded the occurrence of shark-like batoid species in the inshore gillnet fishery of Queensland (Australia) across 2 habitat types. Glaucostegus typus and Anoxypristis cuspidata were most frequently caught in intertidal habitats, whereas Rhynchobatus spp. dominated the catch in inshore coastal habitats. Comparison of gillnet catches to research longline sampling showed that not all size classes of shark-like batoids are captured by the gillnet fishery. Given that home-range size and habitat use by elasmobanchs can change between ontogenetic stages and species, vulnerability to fisheries may vary depending on overlap of preferred habitats and fishing activity and whether each size class is susceptible to the gear. Gillnets are highly selective for certain sizes classes; therefore, knowledge of which sizes and thus which life-history stages are susceptible is necessary to effectively regulate the use of this type of fishing gear. Understanding the occurrence and availability of shark-like batoid species to fishing activities and their contribution as bycatch/by-products in fisheries is critical to management and conservation of these species.KEY WORDS: Shark-like batoid · Fishery · Availability · Bycatch Resale or republication not permitted without written consent of the publisherEndang Species Res 19: 277-284, 2013 East Asia (Bentley 1996, Chen 1996, where reductions in populations have been inferred from declining catch rates (White & McAuley 2003a,b). The gillnet fishery around the Aru Islands (Indonesia) grew rapidly from its inception in the 1970s, reaching a boom of 500 boats in the 1980s. Catch rates have steadily declined, as has the number of boats operating in the fishery (Chen 1996). No target fisheries exist for shark-like batoids in Australian waters; however, rhinobatids, rhynchobatids, rhinids and pristids are caught in trawl and gillnet fisheries (Stobutzki et al. 2002, Zhou & Griffiths 2008, Harry et al. 2011. It is unlikely that these species would become targeted in Australian waters given current regulations. However, given their susceptibility to multiple fishing gears and the value of their fins, it is likely that they will continue to be caught as bycatch and by-products in many locations.Five shark-like batoid species are taken in Queensland (Australia) fisheries, and all are globally threatened based on International Union for Conservation of Nature (IUCN) assessments. The giant shovelnose ray Glaucostegus typus has been assessed as Vulnerable based on intensive fishing pressure and population declines in South-East Asia (White & McAuley 2003a). Although ...

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Evaluating catch and mitigating risk in a multispecies, tropical, inshore shark fishery within the Great Barrier Reef World Heritage Area

Cited by 71 publications

References 41 publications

Conservation challenges of sharks with continental scale migrations

Conservation challenges of sharks with continental scale migrations

The sharks and rays of the Solomon Islands: a synthesis of their biological diversity, values and conservation status

Shark-like batoids in Pacific fisheries: prevalence and conservation concerns

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