Aves | 
Anseriformes | 
Anatidae
			
			
			
				Environment: milieu / climate zone / depth range / distribution range				
				
					Ecology				
				
			
			
				Others; brackish; depth range 0 - 1 m (Ref. 115936), usually 0 - ? m.  Polar			
			
			
				
			
			
			
				Northeast Pacific, Northeast Atlantic and the Arctic.  Temperate to polar.
			
			
			
			
			
				Length at first maturity / Size / Weight / Age
			
			
				Maturity: Lm ?  range ? - ? cm Max length : 46.0 cm TL male/unsexed; (Ref. 94965); max. published weight: 622.50 g (Ref. 356)			
			
			
							
				
				
					
						Culmen:  2.555 cm; tarsus:  3.675 cm; wing:  20.15 cm (Ref. 356).  Medium-sized duck; male:  blue overall; white slashes on shoulder, neck and back; white spots on head and neck; chestnut flanks; female:  brown overall; white ear spot (Ref. 94965).					
				
				
						
			
			
			
			
				
					Depth range based on occurrence (Ref. 115936), to be replaced with a better reference. Surface diving; dabbling; coastal.  Diet:  Crabs (mainly Hemigrapsus nudus, Pagurus spp.), gastropods, polychaetes, amphipods, chitons, Mytilus edulis, limpets, barnacles, Clupea pallasi (eggs) and algae (Ref. 3985).				
			
			
			
			
			
				Life cycle and mating behavior				
					Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae				
			
			
				
									
			
			
			
			
			
				SAUP Database 2006 SAUP Database. www.seaaroundus.org. (Ref. 356)
			
			
			
			
			
			
			
					
						IUCN Red List Status    
						 (Ref. 130435: Version 2025-1)
					
					
					
				
			
			
			
			
				CITES status   (Ref. 108899)
			
			
				
					Not Evaluated				
			
			
			
			
			
			
				
					Not Evaluated				
			
			
			
			
			
				Threat to humans  
			
			
				
									
			
			
			
			
			
			
			
			
				Human uses  
			
			
							
			
			
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Tools
			
			
			
			
				
					More information				
				
					 Population dynamicsGrowthMax. ages / sizesLength-weight rel.Length-length rel.Length-frequenciesMass conversionAbundance   Life cycleReproduction
Maturity
Fecundity
Spawning
Eggs
Egg development
Larvae
  PhysiologyOxygen consumption
  Human RelatedStamps, coins, misc.
  
			 
			
			
			
				Internet sources
			
			
			
			
			
				Estimates based on models
			
			
			
									
						Preferred temperature  					
				 (Ref. 
115969): 1.2 - 11.3, mean 6.6 (based on 1201 cells).			
 
			
			
			
			
			
						
							
				
					
						Fishing Vulnerability  					
					
					
						Moderate vulnerability (36 of 100).					
				
						
						
			
									
						Price category  					
					
					Unknown.