Freshwater ecosystems are extraordinarily rich in their aquatic life. They sustain other terrestrial life and offer numerous ecosystem services to humankind. Fish is one of the most important components of freshwater ecosystems (Darwall et al., 2008). However, the status of freshwater habitat and associated aquatic life including that of fishes is in danger due to intense anthropogenic impacts such as small and big dams, water diversion schemes for irrigated agriculture, deforestation, removal of riparian cover, sand mining and pollution. As a result, freshwater fishes are being driven to extinction. The extinction risk for riverine fishes is believed to be far greater than terrestrial organisms, and may even have exceeded the natural rate of overall species extinction (Ricciardi and Rasmussen, 1999; Dias et al. al., 2017).