METHODS 



Placement of Fry Traps 



Fry traps of two varieties (drift and emergence) were placed 

 at each of the six identified spawning sites. The emergence 

 traps (Fraley, et al., 1986) were placed on the riffle areas of 

 the spawning sites and held stationary with large rocks. 



Drift traps (Wolf 1950) were placed in the thalweg, slightly 

 downstream from the spawning site, to capture fry after they had 

 emerged from the gravel and were moved downstream by the current. 

 The drift traps were anchored to the substrate with steel rebar. 



Fry traps were checked one or two times daily depending on 

 weather conditions. Water temperatures were recorded at each 

 site daily with a pocket thermometer. 



Electrofishing 



The 14 sampling sites (including the six identified spawning 

 sites) were electrofished with either a Coffelt Model BP-1C 

 backpack electrofishing unit (operated on half-pulsed direct 

 current at 100-200 watts of power) or a boat-mounted bank unit 

 with a 120-watt, gasoline-powered generator and a Harley Leach 

 rectifying unit to convert AC current to half-pulsed direct 

 current. Electrofishing took place in either an upstream or a 

 downstream direction depending on stream conditions and access 

 availability. 



