The use of permanent magnets to reduce elasmobranch encounter with a simulated beach net. 2. The great white shark (Carcharodon carcharias)

O’Connell, Craig P.; Andreotti, Sara; Rutzen, Michael; Meӱer, M.; He, Pingguo

doi:10.1016/j.ocecoaman.2012.11.006

Cited by 30 publications

(29 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These findings suggest that beyond the visual stimuli provided by the columns, the magnetic fields might have enhanced barrier exclusion efficacy, further supporting previous studies on magnetoreception capabilities and magnetic repellent effects on elasmobranchs (Rigg et al, 2009;O'Connell et al, 2010O'Connell et al, , 2011aO'Connell et al, , 2012aO'Connell et al, , 2013a.…”

Section: Bull Sharkssupporting

confidence: 88%

“…O'Connell et al, 2012aO'Connell et al, , 2013b). Using this system, observing behaviors such as swim speed and distance away from treatments during both day and night was made possible.…”

Section: Application Of the Aris Dual-frequency Acoustic Cameramentioning

confidence: 99%

“…Exploiting an elasmobranch's ability to detect magnetic fields, research demonstrates that supernormal magnetic stimuli, such as those produced by permanent magnets, can elicit repellent responses in elasmobranchs (Stoner and Kaimmer, 2008;Rigg et al, 2009;Robbins et al, 2011;O'Connell et al, 2010O'Connell et al, , 2011aO'Connell et al, , 2012aO'Connell et al, , 2013a. Scientists hypothesize that these responses occur due to flux differentials that exist between permanent magnets and geomagnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…However, although beach nets are successful at reducing this conflict, substantial and localized elasmobranch mortality occurs (Dudley, 1997;Dudley and Cliff, 1993;Dudley and Gribble, 1999) in addition to non-target species mortality (Gribble et al, 1998). To address this mortality and using the findings from previous beach net-associated magnetic repellent analyses (O'Connell et al, 2012a(O'Connell et al, , 2013a, an eco-friendly conservation technology, known as the Sharksafe barrier, was developed (O'Connell et al, 2014). This barrier contains two key stimuli:…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bull shark ( Carcharhinus leucas ) exclusion properties of the sharksafe barrier and behavioral validation using the ARIS technology

O’Connell

Hyun

Rillahan

et al. 2014

Global Ecology and Conservation

Self Cite

View full text Add to dashboard Cite

a b s t r a c tMagnetic deterrents have recently been employed to assess their ability to reduce elasmobranch mortality in beach nets. With previous studies exhibiting promise, the present study examined the ability of a magnetic barrier technology, known as the Sharksafe Barrier, to exclude bull sharks (Carcharhinus leucas) from bait, and how behavioral interactions may change with variations in environmental and biological factors. Generalized linear mixed model analyses based on 114, 30-min trials illustrate that all interacting C. leucas were successfully excluded from baited procedural control and magnetic regions (i.e. zero entrances through either region). Avoidance and pass around frequencies significantly differed from the control region and were based on situational context. To enhance behavioral analysis techniques, an Adaptive Resolution Imaging Sonar (ARIS) was employed which revealed that C. leucas distance from and swim speed associated with the magnetic barrier region were significantly greater than those associated with the procedural control region. This study demonstrates the Sharksafe barrier's effectiveness in excluding C. leucas from baited regions, regardless of variations in biological and/or environmental parameters. While other bather protection systems (e.g. beach nets and drumlines) continue to be used, this study exhibits promise that the Sharksafe barrier can be an eco-friendly alternative to beach nets.

show abstract

Section: Bull Sharkssupporting

confidence: 88%

“…O'Connell et al, 2012aO'Connell et al, , 2013b). Using this system, observing behaviors such as swim speed and distance away from treatments during both day and night was made possible.…”

Section: Application Of the Aris Dual-frequency Acoustic Cameramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bull shark ( Carcharhinus leucas ) exclusion properties of the sharksafe barrier and behavioral validation using the ARIS technology

O’Connell

Hyun

Rillahan

et al. 2014

Global Ecology and Conservation

Self Cite

View full text Add to dashboard Cite

show abstract

“…Preliminary multi‐year observations (O'Connell et al ., ) in combination with the observations of local researchers (Bimini Biological Field Station, pers. comm.)…”

Section: The Estimated Mean ± Sd Pre‐caudal Length (Lpc) and Head Wmentioning

confidence: 99%

A minimally invasive technique to assess several life‐history characteristics of the endangered great hammerhead shark Sphyrna mokarran

O’Connell¹,

Leurs

2016

Journal of Fish Biology

View full text Add to dashboard Cite

A dorsal-fin photo-identification technique paired with a non-invasive parallel laser photogrammetry technique was used to non-invasively identify individual Sphyrna mokarran over time. Based on the data collected over a duration of 59 days, 16 different S. mokarran (mean ± S.D. pre-caudal length: 220·82 ± 13·66 cm; mean ± S.D. cephalofoil width: 71·38 ± 7·94 cm) were identified using dorsal-fin photo-identification, with a mean ± S.D. shark re-sighting frequency of 4·05 ± 3·06 at-sea days. The results illustrate a high S. mokarran sighting rate and therefore, the utilization of parallel laser photogrammetry and dorsal-fin photo-identification may be a plausible multi-year approach to aid in non-invasively determining the growth rate and inter-annual site fidelity of these animals.

show abstract

Testing the exclusion capabilities and durability of the Sharksafe Barrier to determine its viability as an eco‐friendly alternative to current shark culling methodologies

O’Connell¹,

Andreotti

Rutzen³

et al. 2017

Aquatic Conservation

View full text Add to dashboard Cite

1. Following a shark attack, local governments often rapidly respond by implementing indiscriminate shark culls. These culls have been demonstrated to have substantial localized and adverse effects on a variety of marine organisms, and therefore there is an increasing need for an ecofriendly alternative that maximizes both beachgoer and marine organismal safety.2. In response to such culls, the novel magnetic barrier technology, the Sharksafe Barrier was developed and rigorously tested on a variety of sharks implicated in shark attacks (e.g. bull sharks -Carcharhinus leucas and white sharks -Carcharodon carcharias). Although these studies exhibited promise in shark swim pattern manipulation and C. leucas exclusion, research was lacking in assessing if the technology could serve as an alternative to shark nets, or more specifically, if it could exclude motivated C. carcharias from bait.3. Using a 13 m × 13 m square exclusion zone, this study aimed to test the C. carcharias exclusion capabilities of the Sharksafe Barrier while additionally assessing the long-term structural integrity of the system. 4. After 34 trials and approximately 255 hours of total video collected over two years, data illustrate that all interacting C. carcharias were successfully excluded from the baited Sharksafe Barrier region, whereas teleosts and other small elasmobranch species were not. In addition, the long-term deployment potential of this barrier system held promise owing to its ability to withstand harsh environmental conditions. 5. Therefore, with the successful exclusion of a second large shark species, C. carcharias, from a baited region, continued long-term research and implementation of this system at other locations should be considered to assess its viability and overall success as a bather and shark protection system.

show abstract

The use of permanent magnets to reduce elasmobranch encounter with a simulated beach net. 2. The great white shark (Carcharodon carcharias)

Cited by 30 publications

References 29 publications

Bull shark ( Carcharhinus leucas ) exclusion properties of the sharksafe barrier and behavioral validation using the ARIS technology

Bull shark ( Carcharhinus leucas ) exclusion properties of the sharksafe barrier and behavioral validation using the ARIS technology

A minimally invasive technique to assess several life‐history characteristics of the endangered great hammerhead shark Sphyrna mokarran

Testing the exclusion capabilities and durability of the Sharksafe Barrier to determine its viability as an eco‐friendly alternative to current shark culling methodologies

Contact Info

Product

Resources

About