Gf's sister took this photo and we have been trying to id the fish. found within London

This intriguing photo, taken by Gf's sister, has sparked curiosity about the fish species captured in a murky pond in London. Initially suspected to be a type of carp, the identification remains uncertain. The muddy environment may have contributed to the confusion, as various fish species can thrive in such conditions. Engaging the community in this identification challenge could shed light on the diversity of aquatic life in urban settings. Contributions and insights from fellow enthusiasts may help clarify this mystery.