One hundred and fifty iitunature sauger were collected while 

 electrof ishing the Yellowstone River from Miles City to the North 

 Dakota border (272 river km) during April 19 to 27, 1980 (Figure 

 20) . The largest number of immature sauger for 8 km of river were 

 collected downstream from Intake diversion, approximately three 

 times the numbers in any other section. The next largest abundance 

 occurred between Glendive and Intake diversion. From Glendive to 

 8 kilometers downstream from Intake, 15 percent of the river 

 sampled, 74 immature sauger were collected representing 49 percent 

 of the immature sauger collected. 

 Size and Age Distribution During Autvunn 



Fifteen sample stations on the Yellowstone River were 

 electrof ished from Huntley to the North Dakota border during autumn 

 1977 to 1979. These approximately 8 km long stations were lumped 

 into 4 river sections (Figure 3) and analyzed accordingly. 



Mean length for each year class of sauger in sections 1 

 through 3 of the Yellowstone River were very similar during fall of 

 1977 through 1979 (Table 7) . Even though growth in these 3 areas 

 of the Yellowstone River was similar, grand mean length of all 

 sauger collected in section 1 was significantly smaller all 3 years 

 than the mean lengths of sauger in sections 2 and 3. This can be 

 attributed to the fact that a greater proportion of the sample in 

 section 1 comprised younger (and thus smaller) fish (Table 8) . 

 Grand mean length of sauger collected in sections 2 and 3 were 

 similar in samples from 1977 and 1978 while grand mean length was 

 significantly greater in section 3 than 2 during 1979. 



57 



