12 



10 



STEELHEAD 



< 



to 



< 



CHINOOK 

 MAY 8-11 JUNE 12-15 



SOCKEYE 



(37) (44) (45) (751 (29) (18) (28) (22) 



' IN I I U 111^ 



12 12 12 12 



WATER VELOCITY ( f p.s ) 



Figure 4. — Median pa.s.'sage time.s of cliinook .salmon, steel- 

 head trout, and sockeye salmon in a transportation channel 

 at water velocities of 1 and 2 f.|).s., 1962. Numbers of 

 fish tested are shown in parentheses near the base of each 

 bar. 



STEELHEAD TROUT 



Median passage times of steelliead trout at water 

 velocities of 1 and 2 f.p.s. were 10.6 and 8.8 minutes, 

 respectively (table 2). This difference was not 

 statistically significant. Mean passage times were 

 similar to the medians. Steelliead trout moved 

 somewhat faster at the higher velocity, in contrast 

 to the difference in chinook salmon (fig. 4). Weaver 

 (1963) observed similar performances among steel- 

 head trout, i.e., faster movement as water velocity 

 increased. 



In comparison with the other species tested, steel- 

 head trout obviously spent considerable time in the 

 test cliannel. Given suitable hydraulic conditions, 

 steelhead trout frequently remain in favored pools 

 or runs for varying iioriods of time before proceeding 

 upstream. This characteristic possibly accounts for 

 the relatively slow passage times of this species in 

 the present tests. 



SOCKEYE SALMON 



Performances of sockej^e salmon at the two water 

 velocities were similar to those of chinook salmon. 



Both the median and mean passage times (table 8) 

 give evidence of a slightly faster passage at the 

 lower velocity. The difference between median 

 passage times, however, was not significant. 



T.vBi.E 2. — Median and mean passage times of sterthead trout 

 in an experimental transportation channel at lionnemllc 

 Dam at water mlocities of 1 and 2 f.p.s., Jidi/ SO-.iiK/iisf 

 S, 1962 



' 95-percent confidence intervals about the median. 



■ Four fish failed to roniplet^- i>as8aKe within the •J.'i-minute time limit 

 and wtTf not included in computation of tlie mean. 



^ Excludes one fish that did not complete passaKO within 45 minutes. 



1\\BLE 3. — Mf'fliari and mcati passage times of sockeye saltuo?l 

 in an experimental transportation channel at Bonneville 

 Dam at water velocities of 1 and 2 f.p.s., July 10-13, 1962 



' 95-percent confidence intervals about the median. 



2 One fisli failed to complete passaKft witliin the 45-minute time limit 

 and was not included in computation of the mean. 



CONCLUSION 



A water velocity of 1 f.p.s. is as suitable as one of 

 2 f.p.s. for the passage of chinook salmon, steelhead 

 trout, and sockeye salmon in a transportation 

 channel. 



ACKNOWLEDGMENTS 



dcrald H. Collins and Carl II. Klling assisted in 

 planning the e.xperiinents. William S. Davis sug- 

 gested the e.xperimental design, and the staff at the 

 Fisheries-Engineering Research Laboratory aided 

 in carrying out the work. 



LITERATURE CITED 



Clav. C. EI. 



I'.Kil. Desi{!n of fishw.ays and other fish facilities. I)o[). 

 I'ish. Can., (Jueen's Printer, Ottawa, Can., :{01 pp. 



62 



U.S. FLSH .VND WILDLIKK SKKVU'E 



