How many fish live in the River Thames?

It is difficult to know exactly how many fish live in the River Thames, as the population is constantly changing due to various factors such as pollution, habitat changes, and fishing. However, the Thames is home to a diverse range of fish species, including common carp, bream, tench, pike, perch, eels, and several trout species. According to the Zoological Society of London, there are at least 115 fish species recorded in the Thames.