27. Wetted perimeter in relation to discharge for three 

 sections of the Tongue River, showing the inflection 



point used to determine rearing flows 61 



28. Life history periodicity and minimum flow recommend- 

 ations for selected species and projected flow values 

 for the Tongue River from the T&Y Diversion to the 



mouth 63 



29. Tongue River Reservoir, Montana, showing zones and 



sampling stations 80 



30. Inflow and outflow of Tongue River at Tongue River 

 Reservoir compared with storage elevation of the 



reservoir from April 1975 to October 1976 86 



31. Length-frequency of northern pike captured in trap 

 nets. Tongue River Reservoir, 1974-76, expressed as 



each size interval's percentage of the total sample 95 



32. Average length and length range of northern pike from 



gill-net catches. Tongue River Reservoir, 1964-76 96 



33. Average length and length range of walleyes from gill- 

 net catches. Tongue River Reservoir, 1966-76 98 



34. Length frequency of walleyes captured in trap nets. 

 Tongue River Reservoir, 1974-76, expressed as each size 



interval's percentage of the total sample 99 



35. Length-frequency distribution of white and black crappie 

 taken in trap nets, Tongue River Reservoir, 1975-76, 

 expressed as each size interval's percentage of the 



total sample 102 



36. Monthly distribution of fishing pressure. Tongue River 



Reservoir, 1975-76 108 



37. Monthly distribution of species as determined by creel 



census. Tongue River Reservoir, 1976 110 



