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Temperate perch
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==Species== Australia has the greatest number of percichthyid species, where they are represented by the Australian freshwater cods (''Maccullochella'' spp.), which are [[Murray cod]], [[Mary River cod]], [[eastern freshwater cod]], and [[trout cod]], by the Australian freshwater blackfishes (''Gadopsis'' spp.), which are [[river blackfish]] and [[two-spined blackfish]], and by the Australian freshwater perches which are [[golden perch]], [[Macquarie perch]] (''Macquaria'' spp.), and [[Australian bass]], and [[estuary perch]] (''Percalates'' spp.). Several other Australian freshwater species also sit within the family Percichthyidae, while research using mitochondrial [[DNA]] suggests the species of the family Nannopercidae are in reality percichthyids, as well. Australia is unique in having a freshwater fish fauna dominated by percichthyids and allied families/species. This in contrast to Europe and Asia, whose fish faunas are dominated by members of the Cyprinidae carp family. (Australia does not have a single naturally occurring cyprinid species; unfortunately, the illegal introduction of carp has now established the family's presence in Australia.) A single genus occurs outside Australia, ''Percichthys'' in southern South America. A number of species are or have been important food species; some of these (e.g. the Murray cod, ''Maccullochella peelii peelii'') have become [[threatened]] through [[overfishing]] and river regulation, while others are now [[fish farm|farmed]] to some extent. Some smaller species (e.g. [[Balston's pygmy perch]], ''Nannatherina balstoni'') are popular in [[aquarium|aquaria]]. The extremely rare [[Bloomfield River cod]], ''Guyu wujalwujalensis'', is only found in a short stretch of the Bloomfield River in north [[Queensland]].
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