The fifteen-year-old boy died after a shark injured his leg while surfing in New South Wales.
"They did everything they could to try and save his life, but despite their best efforts, were unable to do so," a local ambulance inspector said.
The wildlife worker was airlifted to hospital but his injuries proved fatal.
Nick Minogue and a friend were out on the water near Pauanui Beach in New Zealand when the shark attacked.
Ocean safety officers have reported the possible sighting of three tiger sharks of at least 10 feet in length, with at least one reported to have "aggressively" chased a group of paddle boarders.
"I think his whole foot was in the shark's mouth, and you could see the bite mark on the top and bottom of his foot," said a friend of the victim. "Must have been maybe a five or six-foot shark."
A German tourist has suffered severe leg injuries in a possible shark attack on a beach in southern Thailand.
A 26-year-old surfer has suffered a foot injury "possibly from a shark" off the coast of North Carolina, local authorities have reported.
"She had a confrontation with what we believe is a lemon shark and managed to get her foot into the shark's mouth somehow," a LifeFlight rescue team spokesperson said.
Katie Milligan said she and Gary Jonhson have both "watched with dismay" at the reduction of fish stocks over the years following fatal shark attack.
Investigators said the incident took place close to Cull Island near West Beach in the Shire of Esperance in Australia. Rescue officials said they are "still searching the ocean for the victim."
Authorities said the man, who is in his 30s, was bitten on the leg while in waters off the coast of North West Island in Queensland, Australia.
The French tourist was swimming at Amitie, in Praslin, the archipelago's second biggest island.
The incident happened on Saturday off Santa Rosa island, Southern California.
Rescue personnel were deployed from the National Sea Rescue Institute Plettenberg Bay station after an eyewitness report of a shark targeting a person at Natures Valley.
The human leg covered in swimwear washed up on the coast of Australia and could have floated hundreds of kilometers.
A 57-year-old man was 200 feet from the shoreline when a 10 to 12-foot shark decided to take a bite from his inflatable paddleboard, before chasing him and another man to shore.
Researchers have designed a material that blends ultra-high molecular weight polyethylene fibres (UHMWPE) onto neoprene, providing the possibility of light-weight shark-proof wetsuits.
The man went missing after a swim in the Hermitage Lagoon, off Saint-Gilles, in the Indian Ocean French overseas territory.
Swedish couple Emma Andersson and Billy Ludvigsson spoke of the drama when they saved the lives of the British backpackers attacked by a shark in the Whitsunday Islands off the northeastern Queensland coast.
There have been a number of shark attacks in the Whitsundays in North Queensland, Australia.
Tourists were shocked when they saw the shark lunge to their vessel in a lagoon in the French overseas territory of Mayotte.
Riley Brown had a close encounter with a shark while surfing with his friends at Woorim Beach in Australia.
Hawaii police said divers recovered clothes identified as belonging to Alan Delatorre. They indicated "damage to the clothing to be attributed to sharks."
This isn't the first shark attack to occur in the waters of northeast Florida and southeast Georgia in recent months.
"At first there was like two sharks and then there was a whole swarm of fish," Russell said, describing the moment that multiple sharks swarmed into the area and attacked.
"I was about 75 per cent sure I wasn't going to make it back to the boat," the fisherman said.
At least three people were bitten in just a two-day period, including a surfer who landed on a shark.