The pod of 150 bottlenose dolphins were first spotted in Douglas Bay a week ago, attracting crowds of observers.
It was the biggest single group of the playful mammal sighted in the area since records began.
However, the appearance of the mammals was such a surprise that no one was able to record the evidence.
A few days later the mammals were back again and this time the dolphin spotters were armed with cameras to take a shot of the pod of up to 100 frolicking in calmer waters.
While it is rare to see such a large pod of dolphins, it is not uncommon to spot dolphins off the Isle of Man.
There were approximately 604 reported sightings of whales and dolphins in the area during 2007 alone.
However John Galpin, of the Manx Whale and Dolphin Watch, said it has only been in recent years that people have realised how many of the dolphins live around the island.
"People thought there were not any whales and dolphins around the Isle of Man. But I kept on seeing killer whales, minke whales and decided to set up the whale and dolphin watch," he said.
"There is a pod of 200 to 220 dolphins living in the Irish Sea. They tend to spend the summer down south around Cardigan Bay and Newquay and then go north to around the Isle of Man for their winter residence.
"We often see them but this is the first time we have sighted such a big pod."
Mr Galpin said Risso's dolphin, common dolphins and basking sharks are all seen around the island and called for more research into marine life in the area.