Lake Sevan, the largest body of water in Armenia, is home to a number of endemic species of fish, including the Sevan trout (Salmo ischchan), which is found only in Lake Sevan. The lake is also home to other species of fish, such as the common carp (Cyprinus carpio) and the Amur sleeper (Perccottus glenii).
In addition to fish, Lake Sevan is also home to a variety of invertebrates, such as snails, clams, and crustaceans. Divers may also encounter interesting underwater rock formations and artifacts, including ancient Armenian ruins and remnants of Soviet-era military equipment.
Other bodies of water in Armenia, such as the Hrazdan River and the Arpa River, are home to a variety of freshwater fish species, including the brown trout (Salmo trutta) and the common dace (Leuciscus leuciscus).