Captured fishes were identified, measured (fork length), weighed, 

 and released except when preserved for reference. Data collected were used 

 to determine species composition, size distribution, and relative abundance; 

 estimates of density were made. These evaluations were compared within 

 and between gravel removal sites. 



Macro! nvertebrates. A 30-cm square Surber sampler was used to collect 

 macroi nvertebrates in riffle areas. Sampling areas were stratified by depth, 

 bottom type, current velocity, and other variables that may have been corre- 

 lated with benthic distribution. At most study areas three sampling sites 

 were selected and five replicate samples were collected at each sampling 

 site. Two sampling sites were selected in a few cases where there were 

 multiple mined areas or where the river was not directly affected by gravel 

 removal, e.g., a pit site away from the stream channel, with five replicates 

 taken per site. 



A Ponar grab was used to collect macro i nvertebrates in pits. Single 

 grabs were taken at several stations spaced to cover the main depth regions 

 within the pits. Ponar grab samples were cleaned, separated (the slurry 

 passed through a U.S. Standard No. 30 sieve), and placed in labeled con- 

 t ai ners. 



Samples co I I ected wi th the Surber sampler were placed directly into 

 labeled containers. Al I sample containers were f i I led with 70 percent al- 

 cohol to preserve specimens for later examination. Samples were picked 

 and sorted in the laboratory. Organisms were sorted into major categories 

 and placed into labeled vials containing 70 percent alcohol. Identification 

 was to the lowest practical taxonomic level. 



Data from quantitative samples were used to obtain total and individual 

 taxon density. Data on standing crop and number of taxa were evaluated; 

 comparisons were made within and between sample sites. 



Pit Sampling Program . Four pits were visited during March 1978 to 

 assess the potential for fish entrapment and overwintering. During the 



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