its what is known as a (skimmer) thats to say its a young bream
Small bream of less than about 1/2lb are popularly known as skimmers, and the average size in most waters is 4oz to 1/2lb, and a large one weighing 3lb or more. They feed mainly in the warmer months but can be caught all year round. Most anglers, especially beginners, love catching bream.
Habitat: All stillwaters and slow-flowing rivers