This fish, that soon was know as Carrot, was put in this Fishery in France 20 years ago. 
 
The article states "The fish is a hybrid species of a leather carp and a koi carp, which are traditionally orange. It's believed to be the second largest of its type caught.
 
"The angler posed for a snap with his catch before releasing it safe and well back into the lake. He celebrated with a cup of tea afterwards.
 
Fishery owner Jason Cowler said: 'We put The Carrot in about 20 years ago as something different for the customers to fish for. Since then it has grown and grown but it doesn't often come out. She is very elusive."
 
https://www.dailymail.co.uk/news/article-11452587/British-angler-catches...