Editing Jellyfish (section)

=== Habitats ===
[[File:Common jellyfish swimming close to shore.jpg|thumb|upright|A common Scyphozoan jellyfish seen near beaches in the Florida Panhandle]]

Most jellyfish are marine animals, although a few hydromedusae inhabit [[freshwater]]. The best known freshwater example is the [[Cosmopolitan distribution|cosmopolitan]] hydrozoan jellyfish, ''[[Craspedacusta sowerbii]]''. It is less than an inch (2.5&nbsp;cm) in diameter, colorless and does not sting.<ref>{{cite web|url=http://www.nobanis.org/files/factsheets/Craspedacusta_sowerbyi.pdf |title=Invasive Alien Species Fact Sheet: ''Craspedacusta sowerbyi'' |last=Didžiulis |first=Viktoras |archive-url=https://web.archive.org/web/20140517210230/http://www.nobanis.org/files/factsheets/Craspedacusta_sowerbyi.pdf |publisher=NOBANIS |archive-date=17 May 2014 |url-status=live |access-date=16 June 2016 }}</ref> Some jellyfish populations have become restricted to coastal saltwater lakes, such as [[Jellyfish Lake]] in Palau.<ref>{{Cite book |url=https://books.google.com/books?id=iQSTgX1UkdUC&pg=PA131 |title=Jellyfish swarms, tourists, and the Christ-child |journal=[[Hydrobiologia]] |first1=Mike N. |last1=Dawson |first2=Laura E. |last2=Martin |first3=Lolita K. |last3=Penland |volume=451 |pages=131–144 |year=2001 |isbn=978-0-7923-6964-6 |doi=10.1023/A:1011868925383|s2cid=1679552 }}</ref> Jellyfish Lake is a [[marine lake]] where millions of golden jellyfish (''Mastigias'' spp.) migrate horizontally across the lake daily.<ref name="Dawson2001" />

Although most jellyfish live well off the ocean floor and form part of the plankton, a few species are closely associated with the bottom for much of their lives and can be considered [[benthic]]. The upside-down jellyfish in the genus ''[[Cassiopea]]'' typically lie on the bottom of shallow lagoons where they sometimes pulsate gently with their umbrella top facing down. Even some deep-sea species of hydromedusae and scyphomedusae are usually collected on or near the bottom. All of the [[stauromedusae]] are found attached to either seaweed or rocky or other firm material on the bottom.<ref>{{cite journal |last=Mills |first=C. E. |author2=Hirano, Y. M. |title=Stauromedusae |journal=Encyclopedia of Tidepools and Rocky Shores |year=2007 |pages=541–543}}</ref>

Some species explicitly adapt to [[tide|tidal]] flux. In [[Roscoe Bay Provincial Park|Roscoe Bay]], jellyfish ride the current at ebb tide until they hit a [[gravel bar]], and then descend below the current. They remain in still waters until the tide rises, ascending and allowing it to sweep them back into the bay. They also actively avoid fresh water from mountain snowmelt, diving until they find enough salt.<ref name=angier2dec />