Teleostei (teleosts) > 
Salmoniformes (Salmons) > 
Salmonidae (Salmonids) > Salmoninae						
							
							Etymology: Oncorhynchus: Greek, onyx, -ychos = nail + Greek, rhyngchos = snout (Ref. 45335).
Eponymy: This species is named after the White Mountain Apache tribe which is concerned for the welfare of this endangered species. (Ref. 128868), visit book page.
						
					
				
					Environment: milieu / climate zone / depth range / distribution range					
						Ecology					
				
				
				
					Freshwater;  demersal; non-migratory (Ref. 46888). Temperate; 34°N -   33°N				
				 
			
			
			
				
				
				
					North America:  Upper Salt River and Little Colorado River systems (Colorado River drainage) in Arizona, USA.
				
				
			
			
				
					Size / Weight / Age
				
				
				
					Maturity: Lm ?  range ? - ? cm
 Max length : 58.0 cm TL male/unsexed; (Ref. 40637); common length : 25.0 cm TL male/unsexed; (Ref. 12193); max. published weight: 2.4 kg (Ref. 40637)				
				 
			
			
						
				
					Short description					
					Identification keys | Morphology | Morphometrics					
				
				
			
			
			
			
			
			
			
				Adults inhabit clear, cool mountain headwaters and creeks (generally above 2500 m elevation), and mountain lakes. Entire life history is spent in freshwater (Ref. 46888).  A 95% (stream km) reduction in range  has resulted due to hybridization with Oncorhynchus mykiss and competition from Salvelinus fontinalis and Salmo trutta.			
			 
			
			
			
				
					Life cycle and mating behavior					
					Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae				
				
				
				
								
				
			
			 
				
				
				
					Page, L.M. and B.M. Burr, 1991. A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. 432 p. (Ref. 5723)
				
				 
			
			
			
							
					
						IUCN Red List Status   (Ref. 130435: Version 2025-1)
					
					
				 
					
			
			
			
			
			
			
			
				
					Threat to humans  
				
				
				
					  Harmless				
				
			 
			
			
			
			
				
					Human uses  				
				
				
					Fisheries: subsistence fisheries; gamefish: yes				
				
				
			
			
						
			
			
			
				
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					Estimates based on models				
				
				
				
				
				
					
					Phylogenetic diversity index  (Ref. 
82804):  PD
50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].					
													Bayesian length-weight: a=0.01047 (0.00488 - 0.02245), b=3.04 (2.87 - 3.21), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 
93245).
					
					Trophic level  (Ref. 
69278):  3.8   ±0.4 se; based on size and trophs of closest relatives					
											
				
				
										
						Resilience  (Ref. 
120179):  Low, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.).					
											
				
									
					Fishing Vulnerability  (Ref. 
59153):  Moderate vulnerability (43 of 100). 
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