BLUEBflCK 



Rq 





f^^^ Controls 



I I l-on-8 Slope 



I I l-on-16 Slope 



I 



i 



Control Terminated Volitional 



Control Terminated Volitional 



Figure 12. — Compariscn of blood lactate levels of 

 blueback and chinook salmon ascending 1-on-8- 

 and 1-on-16-slope endless fishways. Note that 

 fish actively ascending ("Terminated") show an 

 increase in lactate levels typical for each species, 

 and that lactate levels of fish that have stopped for 

 60 minutes of their own volition ("Volitional") are 

 not significantly different from levels of fish that have 

 not been exercised in a fishway ("Controls"). 



l-on-8 slope was shown to be as suitable for the 

 passage of salmonids as the l-on-16 slope when the 

 proper hydraulic conditions were provided. As 

 to the effect of fishway length on the rate of fish 

 movement, the evidence shows that rates of move- 

 ment tend to increase slightly in the initial stages 

 of a prolonged ascent, probably due to learning, 

 and then become quite consistent. An example 

 is given in figure 15. Note that the blueback sal- 

 mon had ascended over 5,000 feet before slowing 

 down to its initial rate of movement. This means 

 that for all practical purposes the rate of move- 

 ment of ascending fish will not decrease in the 

 upper end of a long fishway and so result in crowd- 

 ing or delay. 



Experiments at tlie laboratory support two fur- 

 ther generalizations on the rate of fish movemont 

 in fishways. The first is tliat ascending fish show 

 a tendency to do a certain amount of work in a 

 given amount of time regardless of the slope of 



10 15 20 25 30 



Titne in minutes 



Figure 13. — Pattern of ascent in the l-on-8- and 1-on- 

 16-$lope endless fishways when full overfall weirs 

 and resting turn pools were in use. Note exag- 

 gerated "work-rest" pattern in 1-on-8-slope fishway. 



c Ti 

 o 



V 



E 



65 

 64 

 63 

 62 

 61 

 60 

 59 

 »> 58 



1 ^^ 



56 



S 55 

 t ^^ 



.ifri! 



2 52 



1 51 

 w Lock 



10 16 20 25 30 



Time in minutes 



Figure 14. — Pattern of ascent in the l-on-8- and 1-on- 

 16-slope endless fishways after rest areas were 

 removed from turn pools and with restricted overfalls 

 in the 1-on-8-slope fishway. 



Iiiiiiiiiluil 



0^ 201 » 205 JOi • 30b 401 • d05 



Dote July I July 2 



Pools oscended previously 1600 



July 3 

 3200 



July 4 

 4800 



July 6 

 64 00 



Figura 15. — Passage time per circuit (16 pools) of a 

 blueback salmon that ascended over 6,000 feet in 

 the 1-on-8-slope endless fishway. 



