An
agonistic display by a white shark was observed and photographed during a cage dive at Guadalupe Island in November 2015.
Exhibiting exaggeratedpectoral fin
depression, agonistic behaviors have beenpreviously
observed and describedin several shark species. This account may be the first record of a white
shark in close proximity to a caged diver, exhibiting strong pectoral fin depression significantly dipped, in the mid-agonistic display. Such displaysshould be considered as aggressive and potentially
life-threatening by those using
the ocean for recreational or professional purposes.
References
[1]
Compagno, L.J.V. (2001) Sharks of the World. An Annotated and Illustrated Catalogue of Shark Species Known to Date. Volume 2. Bullhead, Mackerel and Carpet Sharks (Heterodontiformes, Lamniformes and Orectolobiformes). FAO Species Catalogue for Fishery Purposes, No. 1, Vol. 2, FAO, Rome, 269 p.
[2]
Becerril-García, E.E., Becerril-García, E.M., Micarelli, P., Galván-Magaña, F. and Sperone, E. (2020) Behavioural Responses of White Sharks to Specific Baits during Cage Diving Ecotourism. Scientific Reports, 10, Article No. 11152. https://doi.org/10.1038/s41598-020-67947-x
[3]
Nelson, D.R. (1977) On the Field Study of Shark Behavior. American Zoologist, 17, 501-507. https://doi.org/10.1093/icb/17.2.501
[4]
Martin, R.A. (2007) A Review of Shark Agonistic Displays: Comparison of Display Features and Implications for Shark-Human Interactions. Marine and Freshwater Behaviour and Physiology, 40, 3-34. https://doi.org/10.1080/10236240601154872
Klimley, A.P., Pyle, P. and Anderson, S.D. (1996) Chapter 22—Tail Slap and Breach: Agonistic Displays among White Sharks? In: Klimley, A.P. and Ainley, D.G., Eds., Great White Sharks: The Biology of Carcharodon Carcharias, Academic Press, San Diego, 241-255. https://doi.org/10.1016/B978-012415031-7/50023-9
[7]
Torres-Aguilar, et al. (2005) Code of Conduct for Great White Shark Cage Diving in the Guadalupe Island Biosphere Reserve. 2nd Edition, Secretaría del Medio Ambiente y Recursos Naturales, Mexico City.
[8]
Martin, R.A. (2003) Field Guide to the Great White Shark. Reef Quest Centre for Shark Research, Vancouver.
[9]
Gilbert, P.W. (1962) The Behaviour of Sharks. Scientific America, 207, 60-68. https://doi.org/10.1038/scientificamerican0762-60
[10]
Fine, M.L., Winn, H.E. and Olla, B.L. (1977) Communication in Fishes. In: Sebeok, T.A., Ed., How Animals Communicate, Indiana University Press, Bloomington, 472-518.
[11]
Baldridge, H.D. (1975) Shark Attack. Berkley Publishers, New York, 18-19.
