That is a monster!!
I work with a guy who has been in the ADAA for many years and he was telling me about some of the giant Broon troot on the Don from years gone past. He was fortunate to land one a lot of years ago that he guessed was in the region of 15 - 18lbs. He mentioned about how he often saw it having a go at ducks that would land near it. He evntually managed to tempt it after trying everything from fly to worming. What it eventually took was a dead mouse used as a lure on his spinning rod.
Wonder if there are any more like that hidden away on the Don?