Exit Fishway 



Flow- 

 introduction 

 pool 



Transportation ctianne 



Entronce fishway g' 



Rele 

 Fish 



■-Water control weir 



Observation chamber 



ase box 4 Uf 



ih entry(A),y 



Introductory area 

 Excess woter drain qril 



FiGUKE 1. — Diagrammatic plan view of laboratory slunvint; 

 transportation channel and timing zone (A to B). 



Velocities were measured with a cup-type current 

 meter. 



The channel was lighted by 1,000-watt mercury- 

 vapor lights placed feet apart and suspended G feet 

 above the water. Light readings at the surface 

 averaged about 700 foot-candles, which approxi- 

 mates light intensity on a l)right cloudy day. 



PROCEDURE 



Salmonids used in these tests were diverted from 

 the Washington shore fishway at Bonneville Dam. 

 They ascended a short entrance fishway to the lab- 

 oratory. Varying numbers of fish were u.sed in 

 each test, depending on seasonal abundance of the 

 different species. Each fish entering the laboratory 

 was tested only once. After a fish had completed 

 passage through the test facility, it left the lab- 

 oratory through a small exit fishway and entered 

 the main fishway about 200 feet tipstrearn from the 

 laboratory. 



Fish of all sizes were u.sed; however, on a few | 

 occasions, fish were rejected because of severe cuts 

 or other obvious physical injuries. No distinction 

 was made as to sex. l 



EXPERIMENT.\L DESIGN 



A 2 by 2 Latin Sciuare design u.'^ed in these tests 

 allowed 4 days (2 davs at each velocity) for each 

 test. The experiment consisted of four separate 

 tests — two with cliinook salmon {Oncorhynchus 

 tshnwytscha) and one each with steelhead trout 

 (Salmo (jairdncri) and sockeye salmon {Oncorhynchus' 

 nerka). 



TIMING FISH 



Fish entered a relea-se compartment (fig. 2) 



FicrnE 2. — Release compartment. Operator has raised gate 

 (foreground) to allow fish to enter test .area. 



where they were identified as to species and 

 released individually into the test area. Only one 

 fish was permitted in the channel at any one time. 



CO 



U.S. FISH AND WILDLIKi: SEKVICE 



