The Balkhash perch (Perca schrenkii) is a species of perch endemic to the Lake Balkhash and Lake Alakol watershed system, which lies mainly in Kazakhstan. It is similar to the other two species of perch, and grows to a comparable size, but has a slimmer build and is lighter in colour. It has suffered a population decline which is blamed on introduced bream and predatory fish such as the Volga pikeperch.