A good number of species of the families Percichthyidae, Gadopsidae, Nannopercidae, and Terapontidae are endemic to specific localities or have relatively small distributions, thus rendering them vulnerable to extirpation or extinction because of habitat destruction, overfishing, or the introduction of exotic species that either compete with or prey upon some life stage of the native species. For example, among the Per-cichthyidae, the Mary River cod (Maccullochella peelii marien-sis) is listed as Critically Endangered by the IUCN. The trout cod (M. macquariensis) and the Eastern freshwater cod (M. ikei) are listed as Endangered. The mountain perch (Macquaria aus-tralasica) is classified as Data Deficient. In the Nannopercidae, the Oxleyan pygmy perch (Nannoperca oxleyana) is listed as Endangered, the Yarra pygmy perch (N. obscura) and variegated pygmy perch (N. variegata) are listed as Vulnerable. Among the Terapontidae, the silver perch (Bidyanus bidyanus), Adam-son's grunter (Hephaestus adamsoni), and Yamur Lake grunter (Varia jamoerensis), are all listed as Vulnerable.
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