Abstract
Superficial dermal wounds in whale sharks are reported to heal rapidly as with many other elasmobranchs. Here observations of two wounded whale sharks (Rhincodon typus) in Maldivian waters suggest that free ranging sharks are able to recover and rapidly heal from the effects of deeper wounding on internal organs or amputations. One specimen observed impaled by a wooden harpoon shaft, was subsequently re-encountered nearly a year later. The other suffered a near severed first dorsal fin but showed signs of rapid healing. These observations illustrate that despite national bans in whale sharks fishing, the practise persists in the Maldives. Further research to increase understanding of the demography of aggregations of this species is necessary before the impact of illegal exploitation on regional population trends can be determined. National governments are encouraged to enhance marine conservation outreach and education programmes throughout their territories.
References
Anderson RC, Ahmed H (1993) The shark fisheries of the Maldives. Ministry of Fisheries and Agriculture, Male, Republic of Maldives. Food and Agriculture Organisation
Anderson RC, Waheed A (2001) The Economics of Shark and Ray Watching in the Maldives. Newsletter of the IUCN Shark Specialist Group 13. Berkshire, UK: IUCN Shark Specialist Group
Arzoumanian Z, Holmberg J, Norman B (2005) An astronomical pattern matching algorithm for computer-aided identification of whale sharks Rhincodon typus. J. Appl. Ecol. 42:999–1011
Bird PM (1978) Tissue regeneration in three carcharhinid sharks encircled by embedded straps. Copeia 2:345–349
Cárdenas-Torres-Torres N, Enr´ıquez-Andrade R, Rodr´ıguez-Dowdell N (2007) Community-based management through ecotourism in Bahia de los Angeles, Mexico. Fish. Res 84:114–118
Domeier ML, Nasby-Lucas N (2007) Annual re-sightings of photographically identified white sharks (Carcharodon carcharias) at an eastern PaciWc aggregation site (Guadalupe Island, Mexico). Mar Biol 150:977–984
Fitzpatrick B, Meekan M, Richards A (2006) Shark attacks on a whale shark (Rhincodon typus) at Ningaloo Reef, Western Australia. Bull. Mar. Sci. 78:397–402
Graham R, Roberts C (2007) Assessing the size, growth rate and structure of a seasonal population of whale sharks (Rhincodon typus Smith 1828) using conventional tagging and photo identification. Fish. Res. 84:71–80
Gudger EW (1940) Whale sharks rammed by ocean vessels. How these sluggish leviathans aid in their own destruction. New England Naturalist 7:1–10
Heyman WD, Graham RT, Kjerfve B, Johannes RE (2001) Whale sharks Rhincodon typus aggregate to feed on fish spawn in Belize. Mar Ecol Prog Ser 215:275–282
Holden MJ, Raitt DFS (1974) Manual of Fisheries Science Part 2 — Methods of Resource Investigation and Their Application. FAO Fisheries Technical Paper 115, rev. 1. United Nations, Rome
Holland KN, Wetherbee BM, Lowe CG, Meyer CG (1999) Movements of tiger sharks (Galeocerdo cuvier ) in coastal Hawaiian waters. Mar Biol 134:665–673
Holmberg J, Norman B, Arzoumanian Z (2008) Robust, comparable population metrics through collaborative photo-monitoring of whale sharks Rhincodon typus. Ecol. Appl. 18(1):222–233
International Union for Conservation of Nature and Natural Resources (2009) IUCN Red List of Threatened Species. Version 2009.1. <www.iucnredlist.org>. Accessed on 26 August 2009
Lewallen EA, Anderson TW, Bohonak AJ (2007) Genetic structure of leopard shark (Triakis semifasciata) populations in California waters. Mar Biol 152:599–609
Meekan MG, Bradshaw CJA, Press M, McLean C, Richards A, Quasnichka S, Taylor JG (2006) Population size and structure of whale sharks Rhincodon typus at Ningaloo Reef, Western Australia. Mar. Ecol. Prog. Ser. 319:275–285
Myrberg AA, Gruber SH (1974) The behaviour of the bonnethead shark, Sphyrna tiburo. Copeia 2:358–374
Norman BM (1999) Aspects of the biology and ecotourism industry of the whale shark Rhincodon typus in northwestern Australia. Murdoch University, Murdoch, Western Australia, Australia, M.Phil. Thesis
Norman BM, Stevens JD (2007) Size and maturity status of the whale shark (Rhincodon typus) at Ningaloo Reef in Western Australia. Fish Res 84:81–86
O’Sullivan JB (2000) A fatal attack on a whale shark Rhincodon typus, by killer whales Orcinus orca off Bahia de los Angeles Baja California. In: Abstracts of the American Elasmobranch Society 16th Annual Meeting, LaPaz, Mexico, June 14–20, 2000, p. 282
Porcher IF (2005) On the gestation period of the blackfin reef shark, Carcharhinus melanopterus, in waters off Moorea, French Polynesia. Mar. Biol. 146:1207–1211
Reif WE (1978) Wound healing in sharks. Form and arrangement of repair scales. Zoomorphologie 90:101–111
Rowat D, Meekan M, Engelhardt U, Pardigon B, Vely M (2007) Aggregations of juvenile whale sharks (Rhincodon typus) in the Gulf of Tadjoura. Djibouti. Environ. Biol. Fish. 80:465–472
Smith A (1829) Contributions to the natural history of South Africa. Zoolog. J. 4:433–444
Speed CW, Meekan MG, Rowat D, Pierce SJ, Marshall AD, Bradshaw CJA (2008) Scarring patterns and relative mortality rates of Indian Ocean whale sharks. J. Fish Biol. 72:1488–1503
Taylor JG (1994) Whale Sharks: the Giants of Ningaloo Reef. Angus & Robertson, Sydney
Thomson KS, Simanek DE (1977) Body form and locomotion in sharks. Amer. Zool. 11:343–354
Acknowledgments
We thank Conrad Rangali, Swallow Tree Gardens, the Gilchrist Educational Trust, the Royal Geographical Society, the Earth and Space Foundation and the Duke of Edinburgh’s Trust for their generous support. The assistance of the Ministry of Fisheries, Agriculture and Marine Resources is gratefully acknowledged. The help of the dhoni captains and crew was essential as was the support provided by the communities and resorts at the study site. The success of the research should be attributed to the Maldives Whale Shark Research Programme, and former team members James Hancock, Jonathan Leigh, Rhodri Lloyd-Williams, Adam Rees, and Mark Tarrant. We thank the anonymous reviewer and D. L. G. Noakes for their comments and suggestions for improving the manuscript.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Riley, M.J., Harman, A. & Rees, R.G. Evidence of continued hunting of whale sharks Rhincodon typus in the Maldives. Environ Biol Fish 86, 371–374 (2009). https://doi.org/10.1007/s10641-009-9541-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10641-009-9541-0