as width, depth, stream velocity, shoreline configuration, stream bank 

 vegetation, obstructions, channel substrate, and presence of pits affected 

 the gear selection process. Sample gear used at each study site is listed 

 i n Tab I e 3. 



Sample Program. Information recorded in the field included stream 

 name, sample location and description, description of the disturbed area, 

 and the date, time, and existing weather conditions. Visual surveys were 

 conducted within sampling areas to describe habitat and to record the pres- 

 ence of fish. 



Sample Collection, Disposition, and Analysis . A variety of seines with 

 square mesh (3.2 mm), 6 to 10 m long and 1.8 m deep, were used. Seines 

 were extended across the stream from bank to bank and pulled downstream 

 in narrow streams. In larger streams and pits the quarter-haul technique 

 was used. Experimental, multifilament gill nets 15 x 1.8 m, with panels of 

 12.7, 25.4, 38.1, 50.8, and 76.2 mm square mesh, were anchor-set in pits, 

 and, in one case, in the deep, slow-moving section of a large river. 



A backpack shocker, one of the least selective of all active fishing 

 methods, was used in appropriate watercourses. Stream width permitting, 

 a preselected length of stream was blocked with seines and the enclosed 

 area shocked repeatedly until fish were no longer captured or observed. 

 The area of the shocked section was usual ly measured to al low for density 

 est ima t i on . 



Winnow traps selective for juvenile and small adult fishes were used 



to sample aquatic habitats. Traps were located in pools, riffles, and pits 



and were baited with salmon eggs. Traps were usually fished from 12 to 

 24 hours. 



A dip net was used at one site to capture juvenile fishes for identi- 

 fication. Visual surveys were made at each site to record distribution 

 and unusual events or critical habitats, such as spawning areas. 



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