20. (16) Parr marks present as vertical bars 



or oval spots. 



21. (30) Parr marks short, extending little, 



if any, below lateral line. 



22. (25) Gill rakers on first arch, 19 to 26. 



** Pyloric caeca, 140 to 186. 



23. (26) Parr marks faint. Sides below lat- 



eral line iridescent green. 



24. (27) Small when migrating from fresh 



water, approximately 1..5 inches (40 

 mm) long. 



Chum salmon 



21,23 <°- '*> 



2,5. (22) Gill rakers on first arch, 30 to 40. 

 **Pyloric caeca 60 to 115. 



26. (23) Parr marks usually sharply defined. 



Sides below lateral line silvery, not 

 iridescent green. 



27. (24) Relatively large when migrating 



from fresh water, approximately 3 

 to 5 inches (80 to 126 mm) long. 



28. (31) Gill rakers long and slender, more 



than 29 on first arch. 



29. (32) Adipose fin clear, not pigmented. 



Sockeye salmon 

 (0. verka) 



30. (21) 



31. (28) 



32. (29) 



33. (40) 



34. (41) 



35. (42) 



36. (43) 



37. (44) 



38. (45) 



39. (46) 



Parr marks large, vertical bars cen- 

 tered by lateral line. 

 **Gill rakers short and thick, fewer 

 than 29 on first arch. 

 Adipose fin at least partially pig- 

 mented. 



**Plyloric caeca more than 90. 

 Parr marks broader than interspaces. 

 Anterior rays of anal fin not dis- 

 tinctly longer than rest, not white 

 edged. 



Anal fin not pigmented. 

 Black spots, when present, on both 

 lobes of caudal fin. 

 Adipose fin not completely mottled, 

 clear area at anterior base of fin. 

 Black gums along base of lower teeth. 

 Chinook salmon 

 (O. tshawytscha) 



30,34 



39.46 



35,36 



40. (33) **Plyloric caeca less than 80. 



41. (34)^ Parr marks narrower than inter- 



spaces. 



42. (35) Anterior rays of anal fin elongated; 



when depressed they extend to base 

 of last ray. (Fig. 2B) 



43. (36) Anal fin pigmented between rays, re- 



sulting in black banding. 



44. (37) Black spots, when present, on upper 



lobe of caudal. 



45. (38) Adipose fin completely pigmented. 



46. (36) Mouth gray to white. 



Coho salmon 

 (0. kisutch) 



42-43 



