Capture Response and Long-Term Fate of White Sharks (Carcharodon carcharias) after Release from SMART Drumlines DOI Creative Commons
Paul A. Butcher,

Kate A. Lee,

Craig P. Brand

et al.

Biology, Journal Year: 2023, Volume and Issue: 12(10), P. 1329 - 1329

Published: Oct. 12, 2023

Human-shark conflict has been managed through catch-and-kill policies in most parts of the world. More recently, there a greater demand for shark bite mitigation measures to improve protection water users whilst minimizing harm non-target and target species, particularly White Sharks (Carcharodon carcharias), given their status as Threatened, Endangered, or Protected (TEP) species. A new non-lethal method, known Shark-Management-Alert-in-Real-Time (SMART) drumline, alerts responders when an animal takes bait thereby provides opportunity rapid response catch potentially relocate, tag, release sharks. Thirty-six were caught on SMART drumlines New South Wales, Australia, tagged with dorsal fin-mounted satellite-linked radio transmitters (SLRTs) acoustic tags before release. Thirty-one sharks located within 10 days, 22 which provided high-quality locations (classes 1 3) suitable analysis. Twenty-seven percent 59% these first detected 50 h release, respectively. For three days post-release, moved mostly remained offshore (>3.5 km from coast), irrespective sex length. Thereafter, progressively inshore; however, 77% more than 1.9 off coast average 5 away tagging location, post-release. acoustically 591 post-release (ranging 45 1075 days). Although five 36 not receivers, SLRT detections ranged between 43 639 indicating zero mortality associated capture. These results highlight suitability potential tool TEP species such Sharks, they initially move capture site, this bather diminishes immediate risk interactions at that site.

Language: Английский

Environmental factors drive differences in activity between sexes of a large marine predator DOI

Adrienne Gooden,

Brendan P. Kelaher, Yuri Niella

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 980, P. 179436 - 179436

Published: April 28, 2025

Language: Английский

Citations

0
Improving white shark detection capabilities in an Australian bather protection programme using environmental DNA DOI Creative Commons

Zach Clark,

Adam D. Miller, Craig D. H. Sherman

et al.

ICES Journal of Marine Science, Journal Year: 2025, Volume and Issue: 82(4)

Published: March 29, 2025

Abstract Bather protection programmes rely heavily on surveillance tools capable of detecting the presence shark species that are known to physically interact with humans. This study investigates potential for environmental DNA (eDNA) technologies improve detection capabilities and complement current survey methods. We conducted a 14-month monitoring programme at two white (Carcharodon carcharias) visitation hotspots in eastern Australia assessed spatio-temporal patterns near-shore using species-specific eDNA assay, SMART (Shark-Management-Alert-in-Real-Time) drumline captures, acoustic telemetry data from tagged sharks. observed higher frequencies across both locations compared Specifically, surveys provided relatively constant rates period, whereas detections were highly seasonal largely restricted austral winter–spring period. Findings consistent assumptions about spatial ecology year-long sharks subtropical habitats but suggest during summer–autumn months is possibly more prevalent than currently assumed. Overall, this highlights value as tool enhancing capabilities, importance adopting multiple complementary methods when assessing rates. discuss implications these findings bather mitigation overseas.

Language: Английский

Citations

0
Shifts in the incidence of shark bites and efficacy of beach-focussed mitigation in Australia DOI Creative Commons
Charlie Huveneers, Craig Blount, Corey J. A. Bradshaw

et al.

Marine Pollution Bulletin, Journal Year: 2023, Volume and Issue: 198, P. 115855 - 115855

Published: Dec. 2, 2023

Shark-human interactions are some of the most pervasive human-wildlife conflicts, and their frequencies increasing globally. New South Wales (Australia) was first to implement a broad-scale program shark-bite mitigation in 1937 using shark nets, which expanded late 2010s include non-lethal measures. Using 196 unprovoked shark-human recorded since 1900, we show that bites shifted from being predominantly on swimmers 79 % surfers by 1980s increased 2-4-fold. We could not detect differences interaction rate at netted versus non-netted beaches 2000s, partly because low incidence high variance. Although continued occur with tagged-shark listening stations, there were no while SMART drumlines and/or drones deployed. Our effect-size analyses small increase difference between mitigated non-mitigated indicate reductions interactions. Area-based protection alone is insufficient reduce interactions, so propose new, globally transferable approach minimise risk bite more effectively.

Language: Английский

Citations

10
Hooking efficiencies of SMART drumlines and their possible deployment rates vs gillnets for bather protection DOI Creative Commons
Paul A. Butcher, Matt K. Broadhurst, Victor M. Peddemors

et al.

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 11

Published: March 6, 2025

Introduction For 87 years, gillnets have been deployed off up to 51 beaches in New South Wales, Australia, reduce bites on humans by white ( Carcharodon carcharias ), bull Carcharhinus leucas and tiger Galeocerdo cuvier ) sharks. Recently, minimise unwanted fishing mortalities, baited drumlines with electronic catch sensors, called ‘shark management alert real time’ (SMART) trialled. The SMART are more selective than because catches quickly removed (with target sharks spatially displaced), nearly all survive. Nevertheless, important questions remain unanswered, including (1) the required number of at a beach (2) their risk not being due adverse weather—which doesn’t affect gillnets. Methods To answer first question, we analysed 22,025 diurnal drumline deployments across 1637 days for frequency proximal captures (i.e. ≥two caught similar space time) dependence drumlines. second question was investigated collating weather conditions during 31 years target-shark (290 93 sharks) correlating these known operational limitations Results Among 494 hooked sharks, 71% were targets (298 whites, 43 tigers, 9 bulls). No multiple daily recorded or but there 46 instances where five same day, twenty occurrences within km 60 min initial capture. Proximal remained independent region. historical gillnet data revealed would restricted deploying 67–83% period deployed, ~75% those occasions when gillnetted. Conclusion While acknowledge be fewer water users sea conditions, if replace gillnets, greater catching efficiency, selectivity, survival released animals need rationalised against temporally comparable deployments. If latter is acceptable, recommend least two three per ensure hook remains while others checked.

Language: Английский

Citations

0
A taste of youth: Seasonal changes in the diet of immature white sharks in eastern Australia DOI Creative Commons
Rebecca S. Lipscombe, Lauren Meyer, Peter Butcherine

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: July 16, 2024

White sharks ( Carcharodon carcharias ) play a crucial ecological role, shaping ecosystems through direct predation and risk effects. On the east coast of Australia, immature white are broadly distributed, inhabiting wide range habitats from temperate Tasmania to tropical North Queensland. Using stable isotopes fatty acids muscle plasma, we examined diet habitat use 136 (152–388 cm total length) captured on SMART drumlines East Australian coast. This facilitated temporal assessment shark trophic ecology few weeks approximately year. Biochemistry samples showed that predominantly feed low level prey coastal environments. A seasonal shift in was evident, with increasing proportions essential tissues during spring summer suggesting greater consumption high-nutrition preys those months compared autumn winter. By combining isotope acid analysis, gain comprehensive understanding eastern Australia. Our results confirm generalist predators exhibit shifts their diet. Their high reinforces importance these areas for foraging, which is growth development this critical life stage.

Language: Английский

Citations

2
Bull Shark (Carcharhinus leucas) Occurrence along Beaches of South-Eastern Australia: Understanding Where, When and Why DOI Creative Commons
Amy F. Smoothey, Yuri Niella,

Craig P. Brand

et al.

Biology, Journal Year: 2023, Volume and Issue: 12(9), P. 1189 - 1189

Published: Aug. 31, 2023

Unprovoked shark bites have increased over the last three decades, yet they are still relatively rare. Bull sharks globally distributed throughout rivers, estuaries, nearshore areas and continental shelf waters, capable of making long distance movements between tropical temperate regions. As this species is implicated in their range, knowledge environmental drivers bull important for better predicting likelihood occurrence at ocean beaches potentially assist reducing bites. Using largest dataset acoustically tagged world, we examined spatial ecology 233 juvenile large (including sub-adult adult) monitored a 5.5-year period (2017-2023) using an array real-time acoustic listening stations off 21 along coast New South Wales, Australia. were detected more coastal northern NSW (<32° S) but travelled southwards during austral summer autumn. Juveniles not on until reached 157 cm stayed north 31.98° S (Old Bar). Intra-specific diel patterns observed, with juveniles exhibiting higher presence 20:00 03:00, whilst was greatest from midday through to 04:00. The results generalised additive models revealed that often found when water temperatures than 20 °C, after >45 mm rain swell heights 1.8 2.8 m. Understanding influence variables will facilitate education could drive smart behaviour amongst users.

Language: Английский

Citations

6
Capture Response and Long-Term Fate of White Sharks (Carcharodon carcharias) after Release from SMART Drumlines DOI Creative Commons
Paul A. Butcher,

Kate A. Lee,

Craig P. Brand

et al.

Biology, Journal Year: 2023, Volume and Issue: 12(10), P. 1329 - 1329

Published: Oct. 12, 2023

Human-shark conflict has been managed through catch-and-kill policies in most parts of the world. More recently, there a greater demand for shark bite mitigation measures to improve protection water users whilst minimizing harm non-target and target species, particularly White Sharks (Carcharodon carcharias), given their status as Threatened, Endangered, or Protected (TEP) species. A new non-lethal method, known Shark-Management-Alert-in-Real-Time (SMART) drumline, alerts responders when an animal takes bait thereby provides opportunity rapid response catch potentially relocate, tag, release sharks. Thirty-six were caught on SMART drumlines New South Wales, Australia, tagged with dorsal fin-mounted satellite-linked radio transmitters (SLRTs) acoustic tags before release. Thirty-one sharks located within 10 days, 22 which provided high-quality locations (classes 1 3) suitable analysis. Twenty-seven percent 59% these first detected 50 h release, respectively. For three days post-release, moved mostly remained offshore (>3.5 km from coast), irrespective sex length. Thereafter, progressively inshore; however, 77% more than 1.9 off coast average 5 away tagging location, post-release. acoustically 591 post-release (ranging 45 1075 days). Although five 36 not receivers, SLRT detections ranged between 43 639 indicating zero mortality associated capture. These results highlight suitability potential tool TEP species such Sharks, they initially move capture site, this bather diminishes immediate risk interactions at that site.

Language: Английский

Citations

4