Dunedin the home of Jaws
New Zealand is in the top five in the world for shark attacks. How many were due to a single, deadly ‘rogue’ shark patrolling Dunedin’s coastline? Hamish McNeilly reports.
It’s a theory sounding more like the plot of the world’s most famous shark movie.
A great white shark patrols the waters off a beachside community, where it soon develops a taste for human flesh.
Surely a work of fiction. Right? Well, maybe not.
The rogue shark theory – basically that the same great white was behind all three Dunedin fatal attacks – was ‘‘widely dismissed’’, according to Clinton Duffy.
But after years of conducting photo identification and satellite tracking of great white sharks, the Department of Conservation marine scientist and shark expert believes there might just be something in it.
‘‘It is not beyond the realms of possibility.’’
Just don’t call it a ‘‘rogue shark’’. That’s because Duffy prefers the description ‘‘resident shark’’; a shark which returns to an area such as Dunedin.
Most sharks were cold-blooded, so to survive and thrive in the colder waters off Dunedin would need to eat much more than sharks in the tropics.
INSPIRATION FOR JAWS
Duffy said the Dunedin great white encounters fitted into a category of hard-to-explain attacks, such as a spate seen in New Jersey, in the United States, in 1916.
Those four fatal attacks were believed to be the work of one shark, and were said to have inspired the fictional work of Jaws. However author Peter Benchley later played down any connection.
‘‘The jury is still out on how many sharks were involved in that attack, much like the Dunedin one we still have no real idea how many different sharks were involved,’’ Duffy said.
A spate of attacks over a short time frame ‘‘were very difficult to explain scientifically’’.
Adding weight to the rogue, or resident, shark theory was that there had been no more attacks off Dunedin since 1971, despite a known population of great white sharks and more people using the water.
DOES SIZE MATTER?
And then there is the estimated size of the shark from each Dunedin attack.
An analysis of witness statements and coroner reports, obtained by Stuff show variation in the reported size.
The one that killed Les Jordan in 1964 was estimated at 3.5 metres, Bill Black’s shark in 1967 was similarly estimated at 3.6 metres, but Graeme Hitt’s shark in 1968 was said to be 4.5 metres.
And the attack on Barry Watkins in 1971 was by a shark estimated to be up to 4.8 metres in length.
Perhaps unconnected, but demonstrating the size of sharks in the area at the time, was a 1975 photo of a 5 metre shark captured in an Otago Harbour fishing net.
That whopping catch came out the same year as Steven Spielberg’s movie Jaws warned cinema goers: ‘‘You’ll never go in the water again.’’
CANADIAN EXPERT
One person who knows as much about the Dunedin attacks as anyone else, lives halfway across the world in Ontario, Canada.
Steve Crawford, of the University of Guelph, is studying conservation and management of great white sharks in New Zealand.
His research included conducting more than 70 interviews with people from Otago to Fiordland.
‘‘Some of those stories will blow your socks off,’’ he said.
His research, expected to be released this month, included a world-first description of courtship and mating behaviour in great whites, occurring in Otago Harbour.
Crawford said he was struck by the ‘‘life altering nature of these single events’’.
He said: ‘‘You had people whose whole lives were basically wrapped up in the water/land interface and when this happens they never went back.’’
He had no doubt the Dunedin attacks were the work of one shark.
‘‘There is strong reason for suspecting in space and time that it was a single individual.’’
That was because the attacks were localised, and happened across several years.
His interviews revealed sharks often stayed in a particular area, in courtship and mating territories, such as the sandy areas near seal colonies off the Otago coast.
‘‘You effectively have dinner and a movie.’’
OTAGO – PRIME SHARK TERRITORY
‘‘The Otago Peninsula is prime white shark habitat, and not just for food, but also that mating territory.
‘‘That’s where the big male sharks and big females are getting it on.’’
The Dunedin examples were not the usual shark attacks of a predator ambushing prey from below, before taking a bite.
Instead those attacks showed elements of territoriality never seen before.
One of his interviewees, John Malcolm, was tasked with laying shark nets off city beaches, as ‘‘the whole city went nuts for a while’’.
Malcolm maintained he caught between 70-80 sharks in the nets over 11 years, along with dozens of dolphins.
Interestingly, the sharks were caught on the inside of the nets, with the largest great white measuring five metres.
He claimed his catch was underreported by city officials, not wanting to alarm the public.
The nets were widely criticised, but Crawford said it was interesting they coincided with no more attacks.
‘‘When you put these nets out and you catch big fish in the range of something that could have been involved in these attacks, and then all of sudden there are no more attacks, then it is not a smoking gun but shell casings on the ground.’’
But an old black and white photo from Port Chalmers in 1900 proved that ‘‘these large animals have been here on a regular basis’’. Around that time
newspaper reported much excitement after a fisherman harpooned the shark, which had ‘‘been prowling about the harbour for some time past’’.
That excitement led a large crowd ‘‘desirous of seeing the shark’’ to crowd onto a landing stage which began to sink under their weight.
The shark was recorded as 5.5 metres, but that was believed to be an overestimate.
A SHOCKING DEATH
Just a few years later, and further up the coast in the picturesque seaside town of Moeraki, Dunedin engineer William Hutcheson became the fourth recorded shark attack victim.
He was standing in chest-deep water, his son diving off his shoulders, when he was bitten and his calf ‘‘stripped from his knee to his ankle’’.
‘‘Get ashore quickly,’’ Hutcheson told his son. ‘‘I have been bitten.’’
A coroner’s report of the 1907 incident said Hutcheson died on the beach within minutes, after ‘‘all the arteries in the leg had been severed’’.
at the time warned ‘‘the bay is infested with sharks’’.
Hutcheson was one of 11 shark fatalities recorded in New Zealand, of which six were in the North Island.
The online encyclopaedia of New Zealand, Te Ara, claimed another fatality in Moeraki in 1967, but there are no other supporting records.
NEW ZEALAND FIFTH IN THE WORLD FOR SHARK ATTACKS
Meanwhile the International Shark Attack database, compiled by the Florida Museum, noted there had been 51 confirmed unprovoked shark attacks in New Zealand.
Of those 10 were recorded in Otago and five in Southland.
That places New Zealand fifth in the world for unprovoked shark attacks, behind United States, Australia, South Africa, and Brazil.
The largest confirmed record for a female great white shark – usually larger than their male counterparts – was just over six metres. Even larger sharks have been reported but questions remain over the accuracy of the measurements.
When the shark caught in Otago Harbour in 1975 was dissected the then Otago Museum zoologist, John Darby, conducted an autopsy on the specimen, finding in its stomach a skate and various molluscs and crabs. The impressive jaws from that female remain on display at Otago Museum.
MONSTER OF THE DEEP
That display is next to the fossilised tooth of an extinct white shark,
which was larger and heavier than any living great white shark.
This prehistoric shark was related to another extinct megatoothed shark,
which lived about 23 to
26 million years ago. Recovered from North Otago limestone, the
teeth and vertebrae puts its size at potentially more than
9m long in length, and around
8 tonnes in mass.
Rumours of a monster shark lurking off the coast of Dunedin became almost urban legend over the past few decades.
A shark, nicknamed KZ7 after the America’s Cup boat, was cited by