Wahleach Project Water Use Plan Lower Jones Creek ... - BC Hydro

Table 2 Daily chum observations by section. Distribution by percent is calculated using Lower
Jones Creek numbers only.
Lower Jones Creek Lorenzetta
Date S1 S2 S3 S4 S5
22-Sep-08 6 0 1 0 n/a
27-Sep-08 48 0 2 0 n/a
1-Oct-08 86 2 2 4 4
6-Oct-08 103 1 12 6 6
8-Oct-08 109 1 9 4 14
12-Oct-08 84 0 22 8 12
19-Oct-08 24 2 44 8 3
22-Oct-08 53 4 36 6 3
27-Oct-08 15 3 2 0 11
30-Oct-08 15 2 3 1 4
2-Nov-08 17 0 2 2 12
9-Nov-08 11 2 1 1 5
16-Nov-08 7 0 0 0 5
18-Nov-08 0 2 0 0 9
26-Nov-08 0 0 0 0 0
Total 578 19 136 40 88
Distribution 70.5% 2.3% 16.6% 4.9%
For the estimate of total escapement we have excluded the counts from Lorenzetta
since those fish are not directly subjected to the flow regime of Jones Creek. Applying the day
specific counts to the AUC model described above results in an escapement estimate of 537
chum salmon. This assumes a maximum survey life ( r max) of 18 days, a half survey life ( t half) at
20 days and a slope constant (c) of 1.0. Observer efficiency was generally poor during the
majority of the run, and very poor in the latter half (OE ranged from .85-.25 from Oct 19 to the
end of the run). By applying the survey life error estimate of 1.3 days to the day-specific counts
results in escapement estimates ranging from 501 to 578 chum salmon. The escapement
estimate of 537 chum salmon is near the average over the time period (1999-2007 average
escapement 473) (Table 4).
The majority of chum spawning activity in Lower Jones Creek (70.5%) was observed in
Section 1, which holds approximately 10% of all the available spawning area in Lower Jones
Creek, (Table 2,5). Sections S3 (16.6%) and S4 (4.9%) had the next highest levels of activity
(Table 2).
Table 3 Chum salmon spawning density by section in Lower Jones and Lorenzetta Creek 2008.
Lower Jones Creek Lorenzetta
s1 s2 s3 s4 total s5
Escapement 379 12 89 26 537 57
Area m2 600 829 6788 617 8834 579
Spawners/m2 0.631 0.015 0.013 0.042 0.061 0.098
Lower Jones Creek Fish Productivity Monitoring 2008-2009 12