The upper, cleaner stretch of the Yauza is home to about 20 species of fish, predominantly burbot, perch, crucian carp and gobio, but the lower Yauza also has a population of hardy fish. Perch caught near the Yauza inlet in the 1990s contained over 250 times the maximum allowed amount of petrochemical substances. The abundance of crucian carp became public in April 2008, when an accidental release of hot water from a power plant killed over a hundred fish near the Rostokino Aqueduct. "Gobio albipinnatus", a fish that was believed to be extinct in the Moscow Oblast, was rediscovered in the Yauza and the Setun River in 1993.