ISAF 2004 Worldwide Shark Attack Summary

The International Shark Attack File (ISAF) investigated 109 alleged incidents of shark-human interaction occurring worldwide in 2004. Upon review, 61 of these incidents represented confirmed cases of unprovoked shark attack on humans. "Unprovoked attacks" are defined as incidents where an attack on a live human by a shark occurs in its natural habitat without human provocation of the shark. Incidents involving sharks and divers in public aquaria or research holding-pens, shark-inflicted scavenge damage to already dead humans (most often drowning victims), attacks on boats, and provoked incidents occurring in or out of the water are not considered unprovoked attacks. "Provoked attacks" usually occur when a human initiates physical contact with a shark, e.g. a diver bit after grabbing a shark or a fisher bit while removing a shark from a net. The 48 incidents not accorded unprovoked status in 2004 included 15 provoked attacks, 12 cases of sharks biting marine vessels, five incidents dismissed as non-attacks, two air/sea disasters, one scavenge, and 13 cases in which insufficient information was available to determine if shark attack was involved.

The 2004 yearly total of 61 unprovoked attacks was slightly higher than the 57 unprovoked attacks in 2003 but lower than totals of 63 in 2002, 68 in 2001, and 78 in 2000. Despite the recent yearly declines, the number of unprovoked shark attacks has grown at a steady rate over the past century. Overall, the 1990's had the highest attack total (481) of any decade, and the 2000-2004 totals indicate this decade likely will continue that upward trend.

The number of shark-human interactions occurring in a given year is directly correlated to the amount of time humans spent in the sea. As the world population continues its upsurge and interest in aquatic recreation concurrently rises, we realistically should expect increases in the number of shark attacks and other aquatic recreation-related injuries. If shark populations remain the same or increase in size, one might predict that there should be more attacks each year than in the previous year because more people are in the water. Shark populations, by contrast, actually are declining at a serious rate or are holding at greatly reduced levels in many areas of the world as a result of over-fishing and habitat loss, theoretically reducing the opportunity for these shark-human interactions. However, year-to-year variability in local economic, social, meteorological and oceanographic conditions also significantly influences the local abundance of sharks and humans in the water and, therefore, the odds of encountering one another. As a result, short-term trends in the number of shark attacks - up or down - must be viewed with caution. Thus, the ISAF prefers to view trends over longer periods of time (e.g., by decade) rather than trying to assign too much significance to often high year-to-year variability.

In addition to increases in the number of hours spent in the water by humans, the ISAF's efficiency in discovering and investigating attacks has increased greatly over the past decade, leading to further increases in attack number. Transfer of the ISAF to the Florida Museum of Natural History in 1988 resulted in greatly expanded international coverage of attack incidents and a consequent jump in the number of documented attacks. In the early 1990's the ISAF was able to develop important cooperative relationships with many Florida beach safety organizations and medical facilities, leading to increased documentation of attacks from a region that is a world leader in aquatic recreation. Fundamental advances in electronic communication (the Internet and email), a greatly expanded network of global ISAF scientific observers, and a rise in interest in sharks throughout the world, spawned in part by increased media attention given to sharks, have promoted more complete documentation of attack incidents in recent years. ISAF's web pages which include electronic copies of the Attack Questionnaire in four languages as well as a plethora of statistics and educational material about sharks, comprise the most highly accessed shark site on the Internet. Our strong web presence regularly results in the receipt of unsolicited documentation of shark attacks. Many of these attacks likely would have been missed in the past because they occurred in communication-poor locales or areas lacking ISAF representatives.

Seven fatalities occurred in 2004, a total similar to the four in 2003, three in 2002 and four in 2001, but lower than the 11 fatalities recorded in 2000. Two fatalities occurred in Australia and single deaths were reported from Brazil, California, Egypt, Hawaii, and South Africa. The number of serious attacks in 2000-2004, as measured by fatality rate (8.9%), has been lower than that of the decade of the 1990's (12.7%), continuing a century-long trend reflective of advances in beach safety practices and medical treatment, and increased public awareness of avoiding potentially dangerous situations.

As in recent years, the majority (44%: 27 attacks) of incidents occurred in North American waters. The 30 attacks in United States territorial waters (including Hawaii) were significantly fewer than totals recorded in 2003 (41), 2002 (47), 2001 (50), and 2000 (50). Elsewhere, attacks occurred in Australia (12), Brazil (5), South Africa (5), and Reunion Island (3), with single incidents reported from the Bahamas, Cuba, Egypt, Fiji, New Zealand, and Venezuela.

Following recent trends, Florida (12) had most of the unprovoked attacks in the United States. However, this total was remarkably lower than the 2000-2003 average of 33.5 (based on 30 in 2003, 29 in 2002, 34 in 2001, and 37 in 2000). Additional U.S. attacks were recorded in California (6), Texas (4), Hawaii (3), North Carolina (2), Alabama (1), Oregon (1), and South Carolina (1). Within Florida, Volusia County had the most (3) incidents, dramatically down from the 13 reported in 2003, 18 in 2002, and 22 in 2001. This area normally has higher numbers of shark-human interactions as a result of very high aquatic recreational utilization of its attractive waters by both Florida residents and tourists, especially surfers. Other Florida counties having attacks in 2003 were St. Johns (2), Brevard (1), Duvall (1), Lee (1), Martin (1), Palm Beach (2), and Pinellas (1).

Swimmers/waders (25 incidents: 41% of cases with victim activity information) and surfers/windsurfers (24: 39%) were the recreational user groups most often involved in shark attacks in 2003. Less affected were divers/snorkelers (8: 13%). One (2%) attack occurred during a water entry event and in three (5%) attacks the activity of the victim was not ascertained.

The year 2004 world attack totals were similar to yearly totals in 2002 and 2003. The notable decline in United States attacks was directly related to a dramatic reduction in Florida incidents. In the summer of 2004, a series of hurricanes and tropical storms swept across Florida, resulting in numerous fatalities and heavy property damage. The storms also affected human beach utilization patterns, resulting in reduced aquatic recreational activities by residents and tourists. The opportunity for shark-human interactions therefore was diminished, resulting in fewer bites.

The International Shark Attack File, internationally recognized as the definitive source of scientifically accurate information on shark attack, is a compilation of all known shark attacks. In existence since 1958, it is administered by the American Elasmobranch Society, the world's foremost international organization of scientists studying sharks, skates and rays, and the Florida Museum of Natural History at the University of Florida. More than 3,900 individual investigations are currently housed in the ISAF, covering the period from the mid-1500's to present. Many of the data in the ISAF originate from the voluntary submissions of numerous cooperating scientists who serve worldwide as regional observers. Data submitted to the ISAF is screened, coded and computerized. Hard copy documentation, including original interviews and notes, press clippings, photographs, audio/video tapes, and medical/autopsy reports, is permanently archived. Biological researchers and research physicians study investigations housed in the ISAF. Access to ISAF data is granted only after careful screening on a case-by-case basis. Direct access by the press and general public is prohibited since much data, including medical records, is sensitive in nature and is given in confidence. Requests for summary information and non-privileged data are made to the ISAF director, George H. Burgess.

For additional information on sharks and shark attack, visit the Florida Museum of Natural History's shark research web site at: http://www.flmnh.ufl.edu/fish/Sharks/sharks.htm

George H. Burgess
Director, International Shark Attack File
Florida Program for Shark Research
Florida Museum of Natural History
University of Florida
P O Box 117800
Gainesville, FL 32611

gburgess@flmnh.ufl.edu
(352) 392-1721
FAX 352-846-0287
http://www.flmnh.ufl.edu/fish/sharks/sharks.htm