The video shows scuba instructor Keller Laos tend to the stricken mammal’s injured dorsal fin in an eight-minute rescue captured off the Hawaiian coast.
Mr Laros was leading a group of snorkelers to observe manta rays when the incident took place.
While the group were in the water, a dolphin swam towards them after it had earlier let out a cry that had been audible to Mr Laros and the company.
Having noticed the dolphin move strangely, Mr Laros realised that a hook had been embedded in its pectoral fin.
“The way he came right up and pushed himself into me there was no question this dolphin was there for help,” the instructor explained
As Mr Laros helped to untangle the mammal from the fishing line, the dolphin waited patiently as the diver did his work.
“I was trying to unwrap it, I got the line fishing hook out of the pectoral fin. There was a line coming out of his mouth,” said Laros.
“I was worried if I tugged on it, it might hurt him more. I was able to cut the fishing line and unwrap it.”
“I’ve had bottlenose dolphins approach me a lot of times and they are really smart animals,” Laros added.
The video has racked up nearly one million hits on Youtube.