There are 11 species of native freshwater fish in the south-west of Western Australia, and nine of these are found nowhere else in the world (the other two species are also found in eastern Australia). Around Perth, the species we are most likely to see are freshwater cobbler (Tandanus bostocki), western minnow (Galaxias occidentalis), western pygmy perch (Nannoperca vittata) and nightfish (Bostockia porosa).