The sole wiggled out of the angler's grip and leapt into his mouth, wedging itself deep into the angler's throat and cutting off his ability to breathe.
The 28-year-old man was fishing in Dorset, England, when he chose to hold the 14 cm freshly caught fish over his mouth, reports the Guardian.
The man had been joking around with the 14cm fish and put it over his mouth but it wriggled free and jumped down his throat - causing a complete blockage.
Paramedics rushed to the pier where the group were fishing to find the man unconscious, not breathing and going into cardiac arrest.
South Western Ambulance Service says medics were called to the pier in Boscombe, southern England, on October 5 and found a 28-year-old man in cardiac arrest.
Forceps were then employed to pinch the tail of the fish and slowly pull it out, without it sliding back down further.
An underlying evaluation by paramedic Matt Harrison was that the patient was in a urgent circumstance, with a blocked aviation route and was presently in heart failure.
Harrison said the fish, a dover sole, finally came out after six attempts.
"I was intensely mindful that I just had one endeavor at getting this perfectly fine I lost hold or a piece severed and it slid farther of sight at that point there was nothing more that we could have done to recover the obstacle".
Harrison added: "I have never attended a more weird incident and don't think I ever will - but we're all so glad the patient has no lasting effects from his cardiac arrest, which could so easily have had such a tragic and devastating outcome".
Mr Harrison said the fish's barbs and gills became stuck but he eventually succeeded in extracting it in one piece.