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

Journal of Fish Biology
C P O'Connell, G Leurs

Abstract

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.

References

Apr 19, 2007·The Journal of Animal Ecology·Corey J A BradshawMark G Meekan
Apr 1, 2008·Ecological Applications : a Publication of the Ecological Society of America·Jason HolmbergZaven Arzoumanian
Mar 11, 2011·Biology Letters·Taylor K ChappleBarbara A Block
Apr 15, 2015·PeerJ·Christoph A RohnerSimon J Pierce

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