Marine Biology

, 165:34 | Cite as

New non-invasive methods for short-term electronic tagging of pelagic sharks and rays

  • J. Fontes
  • J. Baeyaert
  • R. Prieto
  • G. Graça
  • F. Buyle
  • P. Afonso
Method

Abstract

Biologging technology has provided scientists with unprecedented tools to investigate the ecology and behaviour of marine animals, but tag deployment and attachment methods have lagged behind. Electronic tagging of elasmobranchs still essentially involves implanting anchors or drilling the fins of restrained animals. Here, we present two new non-invasive methods for deploying satellite and biologging tags on pelagic sharks and rays that do not require restraining or manipulation of the animals, nor the attachment of intramuscular anchors. The attachment of a modified fin clamp and a harness systems were tested on 12 blue sharks and four devil rays in the Azores, mid-north Atlantic. Clamps and harnesses were fitted with galvanic timed releases and deployed manually by a free diver or from the boat using a harness tagging pole. The tags remained on the animals over the entire short-term duration of the trials. Focal observations and deployment data suggest that both methods produce little or no adverse behavioural reaction on the animals, offering a valid alternative for short-term tagging of pelagic sharks and rays. Deployment length can be substantially increased by selecting longer duration galvanic timed releases.

Notes

Acknowledgements

This study had the support of Fundação para a Ciência e Tecnologia (FCT), through the strategic project UID/MAR/04292/2013 Granted to MARE, the projects EcoDive (ACORES-01-0145-FEDER-000059), BALA (13/DRAM/2015), and AtlantOS (BG-8-2014). JF, RP, and PA were supported by FCT Grants (SFRH/BPD/66532/2009, SFRH/BPD/108007/2015, and FCT/IF/01640/2015, respectively). Authors would also like to acknowledge Simon Thorrold for providing the satellite tags, Pedro Mesquita for the illustrations and the local dive operators for providing assistance with field work: Dive Azores, CW Azores, NorbertoDiver and PicoSport, and their staff. Finally, the authors thank the Waitt foundation and the Oceano Azul foundation for contributing with boat support.

Compliance with ethical standards

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Conflict of interest

Author A declares that he/she has no conflict of interest.

Supplementary material

227_2018_3289_MOESM1_ESM.mp4 (53.2 mb)
Supplementary material 1 (MP4 54481 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Marine and Environmental Sciences CentreCentre of the Institute of Marine Research of the University of the AzoresHortaPortugal
  2. 2.Department of Oceanography and FisheriesCentre of IMAR of the University of the AzoresHortaPortugal
  3. 3.Okeanos Research Centre of the University of the AzoresHortaPortugal
  4. 4.Nektos.netBrusselsBelgium

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