Figure 8.--The l:8-slope fishway with a 2.0-foot rise between pools on the left and the 1:16- 

 slope fishway with a 1,0-foot rise between pools on the right. 



means of the median elapsed times showed 

 that the difference was not significant. 



Table 4. — Passage times of 12 groups of 



20 steelhead timed in each fishway, 



August 7-10, 1956. 



On August 6, 8 individual steelhead 

 were tested in the control fishway and 

 15 in the test fishway (appendix tables 

 15 and 16). The median passage time 

 was 12.36 minutes in the control fishway 

 and 12.52 minutes in the test fishway 

 indicating no significant difference between 

 passage times in the two fishways. 



Despite the fact tha.t no significant 

 difference could be shown between pas- 

 sage times in the 2 fishways, there are 

 indications that the test fishway was the 

 more difficult to ascend. It was noted 

 that some fish required more than one 

 attempt to go over a weir. We observed 

 this difficulty in the group tests but only 

 in the individual tests could we obtain a 

 complete record. Of the 15 individuals in 

 the test fishway on August 6, 6 passed 

 the 3 weirs with only one attempt at 

 each weir. The remaining 9 required more 

 than one attempt to go over a weir some- 

 where in the fishway. The maximum num- 

 ber of attempts at a weir by the same 

 fish was six. The 15 fish averaged 11/3 

 attempts in crossing the weir. None of 

 the eight fish in the control fishway required 

 more than one attempt to cross a weir. 



Other Factors Affecting Passage Time 



There are numerous factors which 

 possibly influence passage time of sal- 



