Table 1:- -Probability of misclassification (p) and percent overlap of four 



populations based on number of spots below lateral line and number 

 of hyoid teeth. 



Table 2: --Number of spots on the section of body below lateral line and anterior 



to insertion of ventral fins (area 1) and on left side of body below lateral 

 line (total) of mature fish from 4 populations. Number of fish in 

 parenthesis. 



tion of spotting counts did not provide variances 

 which were statistically comparable, and dis- 

 tribution about the regression line for some 

 samples such as Sedge Creek was highly skewed. 

 This deviation from the normal distribution for 

 Sedge Creek was due to the large number of fish 

 with no spots on the anterior part of the body. 

 Only two comparisons fulfilled the requirement 

 of similar variances, which again illustrates 

 the large difference among the samples. The 

 Creston hatchery and Yellowstone Lake samples 

 were comparable, but the overlap approached 

 100 percent with p=0.50, indicating no difference 

 in location of spots on the body in the two popula- 

 tions. Creston and Bear Creek samples had an 

 overlap of approximately 57.5 percent with 

 p=0.288. 



Coloration 



DeWitt (1954) found all gradations of 

 color among different populations of coastal cut- 

 throat, Salmo Q. plarki , and concluded that no 

 single individual could represent this subspecies 

 as far as coloration was concerned. Data col- 

 lected in 1959 on coloration of live spawners 

 entering Arnica, Pelican, Clear, Cub, Grouse, 

 and Chipmunk Creeks illustrate the wide varia- 

 tion in coloration possible among Yellowstone 

 cutthroat trout within the same population. Color 

 patterns in the Yellowstone Lake fish varied by 

 sex, size of fish, and spawning run (table 3). 

 Prominent coloration was directly associated 

 with size of fish. The silver-white phase was 



