HOOPES: SELECTION OF SPAWNING SITES 



Table 2.- 



-Number of sockeye salmon passed upstream through the weirs each day and cumulative upstream count 



at Up-a-tree and One Shot Creeks, 1961. 



Stream and date 



Up-a-tree Creek 



July 28 

 29 

 30 



31 



Aug. 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 13 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 



No. of fish 

 through weir 



1 

 



135 



»121 



1 



35 











10 



3 







26 



59 







9 



2 



3 



19 



10 







12 







































1 



Cumulative 

 count 



1 

 1 



136 



1521 



642 



643 

 678 

 678 

 678 

 688 

 691 

 691 

 717 

 776 

 776 

 785 

 787 

 790 

 809 

 819 

 819 

 831 

 831 

 831 

 831 

 831 

 831 

 831 

 831 

 831 

 831 

 832 



Stream and date 



No. of fish 

 through weir 



Cumulative 

 count 



One Shot Creek 



July 30 

 31 



Aug. 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 



1 

 10 



14 

 146 

 6 

 9 

 3 

 

 



85 

 1 

 

 4 



11 

 

 

 1 

 

 

 5 

 

 4 

 

 

 

 

 

 



1 



2 

 



2 



I 



11 



25 

 171 

 177 

 186 

 189 

 189 

 189 

 274 

 275 

 275 

 279 

 290 

 290 

 290 

 291 

 291 

 291 

 296 

 296 

 300 

 300 

 300 

 300 

 300 

 300 

 300 



301 

 303 



303 



305 



1 At 7.-^0 a m on July 30 the Up-a-tree Creek weir was washed out because of high water. 

 July 31 after the wSter r'eceded and^leared. An estimate of 521 fish was obtamed. Th,s figure 

 2 Counted upstream after survey. 



The weir was replaced and a stream survey made on 

 was used for subsequent cumulative counts. 



these two streams in 1961 (Table 2). Three 

 distinct waves of spawners were observed in 

 studies on nearby Brooks River by Hartman, 

 Merrell, and Painter (1964), 



The distribution of spawners over the length 

 of each stream was determined from repeated 

 counts of occupied redds in survey sections 

 which were established for measuring stream 

 gradients.' The counts were summed by section 

 and totaled for the entire stream. The percent- 

 age of this total occurring in each section was 

 calculated for the year, and these percentages 

 were used as indicators of the distribution of 



' These survey sections will be described in more de- 

 tail later. They consist of 100- to 200-m-long segments 

 of stream channel extending from the mouths of the 

 study streams to the first beaver dam judged to be nor- 

 mally impassable to migrating salmon. 



each year's run. Distribution was not uniform 

 among the three study streams during the 3 

 years of this study but was generally consistent 

 for each stream (Figures 2, 3, 4) despite marked 

 differences between years in the number of 

 spawners (Table 4). 



In 1959, when occupied redd sites were count- 

 ed at 2-day intervals, the distribution of spawn- 

 ers in Hidden Creek changed very little after the 

 first week. Counts were combined to show the 

 similarity in distribution of occupied redds at 

 the end of the first, second, and third week of 

 spawning (Figure 5). By the end of the first 

 week (early period) , 2,625 sockeye salmon had 

 ascended the stream to select redd sites and 

 spawn. An additional 1,239 fish entered and 

 began to spawn during the second week (middle 

 period), and 694 more entered during the third 

 week (late period) . Thus, substantial numbers 



449 



