1990 Grayling Spawning Report 



All grayling and rainbow trout longer than 8.0 inches were 

 tagged with a "spaghetti-type" numbered anchor tag. Recaptures of 

 previously tagged fish were noted. Points of capture for grayling 

 were visually noted and recorded in the field. Recorded informa- 

 tion included the general habitat type and streambed condition 

 where fish were captured and the location by river landmark. These 

 capture locations were later converted to river mile locations 

 using USGS maps (scale: 1:24,000) and a River Mile index. 



SPAWNING HABITAT CHARACTERISTICS 



Capture sites of ripe grayling were visually characterized 

 including habitat type (riffle, pool, etc.) and channel type (main 

 channel, side channel, braided channel). A survey crew returned to 

 11 sites where mature and/or ripe grayling were captured to detail 

 the spawning habitat being utilized. At the point of capture a 

 transect was run across the channel and water depth and flow at 0.6 

 and 0.1 of total depth were measured. In addition, streambed 

 composition was visually estimated by classifying the streambed 

 into silt (0 to 63 microns), sand (64 microns to 0.08 in), small 

 gravel (0.09 to 0.25 in), gravel (0.26 to 3.0 in), and cobble (3.1 

 to 10.0 in) size categories. 



Page - 7 



