Sea Watch said May was a peak time to see orcas, or killer whales.
This video from Visit Norway shows divers exploring these waters, on the lookout for killer whales.
Killer whales can grow up to 28 feet long and eat seals, dolphins and other whales.
BBC: NEWS | UK | Wales | South West Wales | Killer whales surprise twitchers
The two large and nine smaller killer whales are at least 6 miles (10 kilometers) from open water, the mayor said.
Earlier this year HWDT warned that the UK's only known resident population of killer whales was at risk of becoming extinct.
The killer whales that feed on mackerel have been found to have very worn down teeth as a result of their feeding behaviour.
"We have decided to give aid as much as possible so that those killer whales have a better chance of surviving, " Inukpuk said.
SeaWorld Entertainment has filed to go public, two years after Blackstone, a private equity firm, bought the business of roller coasters and killer whales.
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Killer whales might be able to eat them, Watanabe suspects, but Greenland sharks usually stay within deep water that killer whales do not frequent.
The mackerel-loving killer whales are thought to be a distinct family, unrelated to killer whales found in Shetland or others that hunt herring off Iceland.
The waters also support the UK's only resident population of killer whales and two feeding and breeding hotspots for basking sharks, the world's second biggest fish.
The Killer whales can be seen on the BBC series Autumnwatch , which is broadcast at 2100 BST on BBC Two on Friday 16 October.
Looking specifically at some of the earliest and worst hit areas, they report a majority of injured species have not recovered, from seabirds to killer whales.
As well as killer whales, several species of shark have been recorded in the coastal waters, including the enormous basking shark, according to the Pembrokeshire National Park Authority.
BBC: NEWS | UK | Wales | South West Wales | Killer whales surprise twitchers
But the transcendent moment is when we come upon a pod of killer whales fishing right in Barnard Harbour, a straight line of sight from the hotel dock.
Blackfish, about the consequences of keeping killer whales in captivity, is among the documentaries that will be screened at the O2's Cineworld cinema multiplex between 25 and 28 April.
The researchers believe the species represents a missing link between marine crocodiles that fed on small prey, and others that were similar to modern-day killer whales, which fed on larger prey.
Gordon Buchanan presenter and cameraman on the BBC series Autumnwatch has been living aboard the working fishing boat with one other BBC colleague in an effort to capture the killer whales on film.
She told of how a group of killer whales that lives near Vancouver, passing between waters controlled (from a human point of view) by Canada and the United States, have acquired legal protection even though the species as a whole is not endangered.
As the whale-hunt began, he and his people showed up with their flagship and a smaller boat painted to resemble a killer whale, so as to scare the grey whales away.
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