The 28-year-old man was fishing in Dorset, England, when he made a decision to hold the 14 cm freshly caught fish over his mouth, reports the Guardian.
He stopped breathing and suffered a cardiac arrest on the scene at Boscombe Pier, Bournemouth.
They arrived in just two minutes but by that time the patient had gone into cardiac arrest and had stopped breathing.
The sole is similar to the flounder, seen here in the hands of a fisherman in the Baltic Sea.
Mr Harrison said that re-appraisal of the patient inside the emergency vehicle demonstrated further disintegration of his condition and a decrease of heart yield.
The man had tried to place the 14cm Dover sole over his mouth but it wriggled free and jumped straight down his throat, the Daily Mirror reported.
Despite attaching him to a ventilation machine, oxygen was still not entering his lungs and paramedics took six attempts to pull the fish from his throat by the tail.
"It's tradition to kiss your first catch", Ian Cowie, one of the unnamed angler's fishing buddies. "When crews were called to Boscombe Pier they had no idea what they would find when they got there".
"It was clear that we needed to get the fish out or this patient was not going to survive the short journey to Royal Bournemouth Hospital", ambulance paramedic Matt Harrison told the BBC.
"I was acutely aware that I only had one attempt at getting this right".
Mr Harrison added the outcome could have been a lot worse.
Mr Harrison included: "I have never gone to a more odd occurrence and don't think I ever will - yet we're all so happy the patient has no enduring impacts from his heart failure, which could so effectively have had such a lamentable and decimating result".