U S Beaches

Shark attacks increased around the world in 2021 following three consecutive years of decline, though beach closures in 2020 caused by the COVID-19 pandemic could be making the numbers seem more dramatic than they are, officials said Monday. The U.S. once again reported the most attacks and Florida accounted for nearly 40% of unprovoked bites worldwide.  

Researchers with the International Shark Attack File recorded 73 unprovoked incidents last year, compared to 52 bites in 2020, according to a new report. The research is administered by the Florida Museum of Natural History and the American Elasmobranch Society.     

International Shark Attack File manager Tyler Bowling pointed out that 52 bites in 2020 were the lowest documented in more than a decade. The 73 bites in 2021 more closely align with the five-year global average of 72.

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"Shark bites dropped drastically in 2020 due to the pandemic." Bowling said in a statement. "This past year was much more typical, with average bite numbers from an assortment of species and fatalities from white sharks, bull sharks and tiger sharks."

The U.S. once again reported the most unprovoked shark bites in 2021, with 47 confirmed cases -- 64% of the worldwide total. Australia had the second most unprovoked incidents with 12, researchers said.

> Nature: Great white sharks 02:41

Researchers saw a total of 11 shark-related fatalities last year, with nine considered unprovoked. Australia led the world with three unprovoked deaths, followed by New Caledonia with two. The United States, Brazil, New Zealand and South Africa each had a single unprovoked fatal shark attack.

Unprovoked attacks occur when there is no human provocation. Provoked attacks are defined as when humans initiate contact, such as divers trying to touch a shark or fishermen removing a shark from a fishing net, according to the International Shark Attack File.

Florida has led the U.S. and the rest of the world in unprovoked shark bites for decades, and the trend continued in 2021, researchers said. Florida had 28 unprovoked bites last year, compared to 19 in the rest of the U.S. and 26 total outside the U.S.   Florida's 28 cases represent 60% of the U.S. total and 38% of unprovoked bites worldwide. 

This is consistent with Florida's most recent five-year annual average of 25 attacks. Of Florida's 28 unprovoked bites, 17 were in Volusia County, which includes Daytona Beach.

The single fatal unprovoked shark attack in the U.S. in 2021 was in California. A man was killed while boogie boarding in Morro Bay on Christmas Eve.   

Attacks by great white sharks against humans are often a result of mistaken identity, according to a study research published in October.

Sharks, according to the research, have limited color perception if they are not completely color blind, and have spatial resolving power that is "considerably worse than humans."

Researchers found that juvenile great whites cannot significantly differentiate between humans swimming, humans paddling surfboards, and pinnipeds, including sea lions and seals. The silhouettes of the different objects at the surface are too similar for the animals given their reliance on motion and light.

"From the perspective of a white shark...neither visual motion nor shape cues allow an unequivocal visual distinction between pinnipeds and humans," the study says, "supporting the mistaken identity theory behind some bites." 

Li Cohen contributed to this report.

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