'pU^une^ 



1. Yellowstone River Basin 3 



2. Tongue River in Montana: major diversions, tributaries, 



and sampling sections 11 



3. Longitudinal profile of the Tongue River in Montana 12 



4. Comparison of diversity indices for 1974 (6 runs) and 1975 (3 runs) 

 and combined fall sampling (9 runs) at each primary sampling 



station on the Tongue River 25 



5. Comparison of the Shannon-Weaver diversity indices for 1974 

 and 1975 fall fish sampling in the Tongue River and the 

 combined fall sampling at each of the primary sections 



excluding fish that were less than 150 mm in length 25 



6. Comparison of the 1975 and 1976 shovelnose sturgeon fork 



length frequencies (by percentage of catch) in the Tongue River. ... 27 



7. Comparison of the fork length frequencies of shovelnose 

 sturgeon taken in the Tongue River with those taken in the 

 Yellowstone River at Intake in the spring of 1975 28 



8. Weight- frequency histogram of the shovelnose sturgeon collected 



in the spring of 1975 in the Tongue River 30 



9. Weight-frequency histogram of the shovelnose sturgeon 



collected in the spring of 1976 in the Tongue River 31 



10. The length-weight relationship equation of all shovelnose 



sturgeon collected in the spring of 1976 in the Tongue River 33 



11. Linear regression analysis of the weight at tagging (before 

 spawning) compared with the weight at recapture (after 



spawning) of shovelnose sturgeon in the Tongue River 35 



12. Five-day average temperatures (°C) and discharges in 

 relation to the spawning activities of the shovelnose 



sturgeon and sauger in the spring of 1975 in the Tongue River 36 



13. Five-day average temperatures (°C) and discharges in relation 

 to the spawning activities of the shovelnose sturgeon and 



sauger in the spring of 1976 in the Tongue River 38 



