Salamanderfish
Lepidogalaxias salamandroides (Scott River to Kent River) 
Western Minnow
Galaxias occidentalis (Arrowsmith River to Waychinnicup River)  COMMON JOLLYTAIL
Galaxias maculatus (Kent River to Thomas River)
+ TROUT MINNOW
(Spotted Minnow) Galaxias truttaceus (Goodga River) 
MUD MINNOW
Galaxiella munda (Moore River, Margaret River to Goodga River) 
BLACK-STRIPE MINNOW
Galaxiella nigrostriata (Swan River, Collie River, Blackwood River to Kent River) 
BALSTON'S PYGMY PERCH
Nannatherina balstoni (Moore River, Margaret River to Goodga River) 
NIGHTFISH
Bostockia porosa (Hill River to Kalgan River) 
FRESHWATER COBBLER
Tandanus bostocki (Moore River to Frankland River) 
WESTERN PYGMY PERCH
Edelia vittata (Arrowsmith River to Goodga River) | | The south-western region of Western Australia has a unique assemblage of freshwater fishes. While the diversity is low, with only 10 native freshwater fish species, 8 are endemic and thus, are found nowhere else. The region has the highest percentage of endemic fishes in the country. They are all well adapted to life in the variable aquatic environment of the south-west, which is characterised by a long dry summer and a cool wet winter. Two of the species, the black-stripe minnow and the salamanderfish live in ephemeral pools (i.e. ones that dry each year) and survive the dry spells by burrowing in the mud. With the exception of the freshwater cobbler, all of the species are small (generally < 150 mm), yet the nightfish and the pygmy perches are related to one of the world's largest freshwater fish species, the Murray cod. Three of the five species of galaxiids (or minnows) are endemic, while the spotted minnow and trout minnow are also found in south-eastern Australia, including Tasmania. Five species of freshwater fish, the black-stripe minnow, mud minnow, salamanderfish, Balston's pygmy perch and trout minnow have very restricted distributions, with the first four listed as restricted or vulnerable. The trout minnow appears to now be restricted to the Goodga River, but like the spotted minnow is also found in south-eastern Australia. While 10 of the species are classified as freshwater, two are considered estuarine (western hardyhead and Swan River goby), often being found a long way upstream in some rivers (particularly those that have become unnaturally salty through extensive land clearing). | |