Steelhead . - -Twelve groups of 20 steel- 

 head were timed in each fishway (table 3). 

 The mean of the median elapsed times in 

 the test fishway was 10.21 minutes, and in 

 the control, 15.42 minutes. A /test on the 

 means of the median elapsed times indi- 

 cated that passage time was significantly 

 lesser in the test fishway. Passage times 

 of the individual steelhead timed in these 

 fishways are shown in appendix tables 1 

 and 2. The median passage time in the test 

 fishway was less than that in the control 

 fishway but the samples were too small to 

 make a statistical test for significance. 



Chinook. --Chinook salmon were not 

 abundant enough at this time of year to 

 make group releases. Five individual Chi- 

 nook were tinned in the test fishway and 

 three in the control fishway (appendix 

 tables 3 and 4). The passage times were 

 less in the test fishway than the control in 

 this small test. 



Table 3. — Passage times of 12 groups of 



20 steelhead timed in each fishway, 



August 15-20, 1956. 



1:8 Slope, 1. 5-foot Rise 



This test fishway had a 1.5 -foot rise 

 between pools (figure 6). It is listed as 



Type 3 in table 1. The control fishway was 

 Type 1. The species composition of the fish 

 run at this time of the season made it 

 impossible to use a group release tech- 

 nique, so tests were conducted with indi- 

 vidual fish. 



Steelhead. - -Sixty -seven steelhead were 

 introduced into the fishways from August 24 

 to August 29, 37 in the test fishway (appen- 

 dix table 5) and 30 in the control fishway 

 (appendix table 6). The median passage 

 time was 9.67 minutes in the test fishway 

 and 13.72 minutes in the control. A table of 

 confidence intervals for the nnedian did not 

 show a significant difference between the 

 median passage times of the two fishways. 



Other studies necessitated reducing 

 the control fishway width to 6 feet (figure 

 7) (Type 1-A). The test fishway was not 

 changed. On September 4, 5, and 6, passage 

 times of 21 steelhead were obtained in the 

 test fishway (appendix table 7) and 28 in the 

 control (appendix table 8). The median 

 passage time was 10.90 minutes in the test 

 fishway and 11.93 minutes in the control, 

 thus indicating no significant differences in 

 times bet'ween the two fishways. 



Chinook, --Forty -two chinook salmon 

 were introduced into the fishways from 

 August 24 to August 29, 18 in the test fish- 

 way (appendix table 9) and 24 in the control 

 (appendix table 10). The median passage 

 tinne was 14,40 minutes in the test fishway 

 and 8.32 minutes in the control fishway. A 

 table of confidence intervals for the median 

 indicates that this is a significant difference. 



On September 4, 5, and 6, 24 chinook 

 were introduced into the test fishway (ap- 

 pendix table 11) and 23 chinook into the 

 six -foot -wide control fishway (appendix 

 table 12). The median passage time was 

 10.83 minutes in the test fishway and 6.67 

 minutes in the control. The median time the 

 salmon spent in the control fishway was 

 less, but a table of confidence intervals 

 for the median indicates that the difference 

 between median passage times was not 

 significant. 



Silvers . --Five silver salmon were 

 tested in the 1 1.5 -foot -wide control fish- 

 way and 9 in the test fishway (appendix 

 tables 13 and 14). The median passage 

 time in the test fishway was less but 

 statistical tests were not made. 



