Carl Udry had the confidence to leave his bait in the water for 30 hours to tempt this 51lb 4oz common.
The Wellington Country Park fish, known as the Chinese Common, had not been caught for nine months and had been feared a victim of last year's fish kill at the Berkshire venue.
Carl moved into the Bush swim at the big-fish water and targeted familiar spots.
He said: “At 125yds it can sometimes take a few attempts but just the second cast felt like the one.
“As Friday passed and we moved in to Saturday I still knew my best chance of a bite would be during daytime hours and so it proved.
“At 6pm, 30 hours after casting, I got a typical island bite where the bobbin slowly pulled in to the face of my Delkim before a steady unwind of line from the spool.
“A truly epic fight followed, climaxing with me having no choice but to literally run in fully clothed up to my waist with the net.
“At that time, I had no idea it was going to be one of the Welly A-Team in the shape of the Chinese Common.
“It must have been 12ins to 14ins wide and was in absolutely pristine condition.”
Carl baited with 4kg of heavily glugged 20mm Sticky Manilla boilies.