Editing Discus (fish) (section)

==Distribution and habitat==
[[File:Distribution of Symphysodon.png|thumb|left|upright|alt=This is a map of distribution of Symphysodon (Discus fishes, in orange, in yellow Amazon River drainage basin).|A map of the range (orange shading) of ''Symphysodon'']]

''Symphysodon'' species inhabit the margins of floodplain [[lake]]s and [[river]]s in the lowland [[Amazon basin]],<ref name=Campton2008/> where they are part of the highly diverse [[Neotropical fishes|Neotropical fish]] fauna. ''S. discus'' is restricted to [[Blackwater river|blackwater]] habitats, but periodically these may experience brief floods of [[Whitewater river (river type)|whitewater]].<ref name=Bleher2007/> ''S. tarzoo'' is found in both black<ref name=Bleher2007/> and whitewater,<ref name=ready2006/> and ''S. aequifasciatus'' also occurs in [[Clearwater river (river type)|clearwater]].<ref name=Bleher2007/> Because of their preference for [[lentic]] habitats such as floodplains and [[flooded forest]]s, whitewater inhabited by discus contains little suspended material (unlike main sections of whitewater rivers).<ref name=Amado2011/>

The three species of ''Symphysodon'' have different geographic distributions. ''S. aequifasciatus'' occurs in the East Amazon downriver from the [[Purus Arch]] and ''S. tarzoo'' in the West Amazon upriver from the Purus Arch.<ref name=ready2006/> In contrast, the distribution of ''S. discus'' appears to be limited to the lower reaches of the [[Rio Negro (Amazon)|Rio Negro]], upper [[Uatumã River|Uatumã]], [[Nhamundá River|Nhamundá]], [[Trombetas River|Trombetas]], and [[Abacaxis River]]s.<ref name=ready2006/><ref name=Amado2011/>

The [[Nanay River]] in far western Amazonas is outside the native range; discus in this river were [[Introduced species|introduced]] from stock originating in the [[Tefé]] area by an aquarium exporter more than 30 years ago.<ref name=Bleher2007/>

A significant number of discus now live in fish farms in [[Southeast Asia]]. These discus go to home aquaria around the world.<ref>{{Cite web |date=28 July 2018 |title=Build Your Dream Discus Fish Aquarium - an Expert Guide |url=https://freshwatercentral.com/build-your-dream-discus-aquarium-an-expert-guide |access-date=13 May 2019 |archive-date=24 May 2022 |archive-url=https://web.archive.org/web/20220524084321/https://www.freshwatercentral.com/build-your-dream-discus-aquarium-an-expert-guide |url-status=dead }}</ref>