BDMLR said the dolphin’s breathing rate was within normal parameters and there were no signs of injury or infection.

“It was quite an interesting experience trying to release the animal… the first boat actually we couldn’t get the engine working on, so we ended up getting towed down by a second boat,” Mr Jarvis said.

“So we had this strange procession go past Fowey Regatta with three of ourselves, medics, on board a boat with a dolphin on top of a paddleboard and an airbed, being towed by another boat, out to the mouth of the river Fowey to open water so we could release it.”