The girl, identified at a news conference with her parents afterward as Lola Pollina, said she was standing in waist-deep water at Sailors Haven beach in nearby Brookhaven, 3km east of Islip, when she was bitten.
What appeared to be a shark's tooth was extracted from the boy's leg and will be analyzed to determine the species of the creature he encountered while boogie-boarding at Atlantique Beach in the town of Islip, officials said.
Fire Island beaches were closed while authorities investigate after two young people said they were bitten by a shark on Wednesday afternoon.
Philip Pollina told NBC his daughter was waist deep in the water off Sailors Haven when she began panicking. The boy, who was part of a town camp, is OK and was able to walk on and off a police boat before he was sent to the hospital for non-life threatening injuries. "It has not been totally confirmed" that the boy was bitten by a shark, Carpenter said, but lifeguards and emergency medical personnel who treated the victim assumed it was a shark bite when they found the shark tooth in his leg.
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"I probably will go in the water again", she said, "but I'll be more careful".
The incident was one of two reported along Fire Island on Wednesday.
"Once we figured it out it was pretty surreal", he said. There was no confirmation that those sharks were involved in the two attacks.
The attacks come in the week when experts said that new types of sharks could be heading to Irish and British waters as a result of warming seas. "We're seeing this as an opportunity to remind everyone that the water is attractive - its magnificent here on the south shore of Long Island, but treacherous". He said, however, that he would need to look at a better picture of the tooth to be able to make any definite assessments.