Editing Arctic grayling (section)

==Life cycle==
[[File:Arctic grayling spawning.jpg|thumb|Arctic grayling spawning]]
Several life history forms of Arctic grayling occur: [[fluvial]] populations that live and spawn in rivers; [[Lake|lacustrine]] populations that live and spawn in lakes; and [[Fish migration|potamodromous]] populations that live in lakes and spawn in tributary streams.<ref>{{cite web |title=Arctic Grayling: Sailfish Of The North |url=https://www.denali.org/denalis-natural-history/arctic-grayling-sailfish/ |website=www.denali.org |access-date=19 November 2023}}</ref>

The Arctic grayling occurs primarily in cold waters of mid-sized to large rivers and lakes, returning to rocky streams to breed.  The various subspecies are omnivorous. [[Crustacean]]s, [[insect]]s and insect [[larva]]e, and fish eggs form the most important food items. Larger specimens of ''T. arcticus'' become [[Piscivore|piscivorous]] and the immature fish feed on [[zooplankton]] and insect larvae.
[[File:ArcticGraylingUSFWS.jpg|thumb|250px|{{convert|10|in|cm|abbr=on}} Arctic grayling from the [[Gulkana River]], Paxson, Alaska.]]
Spawning takes place in the spring. Adult fish seek shallow areas of rivers with fine, sand substrate and moderate current. Males are territorial and court females by flashing their colourful dorsal fins; the fins are also used to brace receptive females during the vibratory release of [[milt]] and [[roe]]. The fish are nonguarders: the eggs are left to mix with the substrate. Although the Arctic grayling does not excavate a nest, the highly energetic courtship and mating tends to kick up fine material which covers the [[zygote]]s. The zygote is small (approximately {{convert|3|mm|in|abbr=on|disp=or|1}} in diameter) and the embryo will hatch after two to three weeks. The newly hatched embryo remains in the substrate until all the [[Egg (biology)#Fish eggs|yolk]] has been absorbed. They emerge at a length of around {{convert|12|to|18|mm|in|abbr=on|1}}, at which time they form [[Shoaling and schooling|shoals]] at the river margins. The juveniles grow quickly during their first two years of life.