millimeter. Age classes were determined based on the length frequency distribution of the 

 sample population (Jearld 1983). 



Habitat parameters were assessed qualitatively. The parameters and methods of 

 evaluation are as follows: 



Sculpin Abundance - qualitatively assessed based on catch efficiency using 



electroshocker: rare (difficult to catch 5 sculpins), uncommon (5 to 10 sculpins 

 caught with concerted effort), common (10 to 15 sculpins caught with minimal 

 effort), abundant (15 or more sculpins caught easily). 



Stream Character - dominant stream character where sculpins were captured, i.e., pool, 

 run, and riffle. Pools were identified as the slow, deepwater sections; riffles as the 

 steeper gradient sections with high current velocities and Whitewater forming; runs 

 were the sections with moderate current velocites but with smooth surface water 

 typically found at the tail of pools and between riffles. 



Habitat Length - length of sample site (m). 



Gradient - estimate of percentage of elevation lost over distance traveled. 



Substrate Composition - qualitative estimate of percentage of area occupied by silt 

 (< 0.2 cm in diameter), sand (0.2-0.5 cm), gravel (0.5-7 cm), rubble (7-20 cm), 

 boulder (20-50 cm), and bedrock in the sample reach. 



Rooted Aquatic Plants - present (yes) or not present (no). 



Filamentous Algae - qualitative assessment of area and thickness of algal mat; rare 

 (difficult to discern algal mat on substrate), uncommon (algal mats are patchy), 

 common (algal mats covering much of substrate but underlying rocks remain 

 discernible), abundant (algal mat covering entire substrate, filaments long, mat 

 greater than 5 cm in thickness, substrate not discernible under mat). 



