species, eggs were taken into the lab and diameters measured to the 

 nearest 0.01 mm with a dissecting scope and micrometer. To verify 

 egg diameters as reported in the literature eggs from several ripe 

 walleye and sauger were also measured. 



Four transects on the Yellowstone River downstream from Intake 

 diversion were sampled for sauger and walleye eggs during 1977 

 (Graham et al. 1979) through 1979. Hydraulic parameters at this 

 site for various flows were predicted with the aid of the water 

 surface profile program (Graham et al. 1979). 



Eggs and larvae were collected as they drifted downstream by 

 suspending 0.5 m standard plankton nets just below the surface of 

 the water. Mesh aperture of the nets was 760 microns. Nets were 

 secured to bridges or fence posts driven into the substrate. Water 

 velocity, measured at the mouth of the nets, and length of time 

 sampled was recorded to determine volume of water sampled. Drift 

 samples were collected at 7 locations: 1) the Yellowstone River 3.2 

 km upstream from the mouth of the Tongue River; 2) the Tongue River 

 0,8 km upstream from its confluence with the Yellowstone, 3) the 

 Powder River 0.8 km upstream from its mouth, 4) the Yellowstone 

 River 0.2 km upstream from Intake diversion dam, 5) Intake 

 diversion canal approximately 0.2 km form its source, 6) the 

 Yellowstone River 1.4 km downstream from Intake diversion, and 7) 

 the Yellowstone River approximately 19 km upstream from its 

 confluence with the Missouri. Descriptions by Nelson (1968b), 



17 



