structural:reformatting, information:extraction
Fauna

The Yamuna from the source to its culmination in Ganges is a habitat for fish for approximately 1,400 km (870 mi) stretch and supports a rich diversity of species. Fish from the family Cyprinidae dominate the variety of fish species found in the river. This includes Indian carp and also invasive species from the family. In a study, 93 species of fish were found in the river including catfish. Species of non-native Tilapia have become established in the river. They have been implicated in the decline of the Ghariyal (Indian crocodile) population in the river. Large turtles used to be a common sight on the river a few decades ago but they have mostly disappeared.