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

Table 6.Species composition of fish captured in the Lower Jones Creek trap 2009.
Common Name
Salmonids
Taxonomic Name Total Catch % Composition
Chum Salmon Oncorhynchus keta 231 95.5%
Rainbow Trout
Non-salmonids
Salmo mykiss 2 0.8%
Sculpins Cottus (sp) 8 3.3%
Longnose Dace Rhinichthys cataractae 1 0.4%
Total 242
Chum fry were captured on 30 of the 54 trapping days for a total of 231 fry. The first chum fry
was captured on March 28 and the last was captured on May 7, 2009. The peak single day
catch for chum fry occurred on April 25 when 30 were captured, (Figure 7). Out-migration
timing dates for chum fry were 10% by April 11, 50% by April 25, and 90% by May 5. The
number of out-migrating chum fry captured in 2009 was the second largest amount since
surveys began in 1999 (Table 12).
Daily chum Fry Capture .
35
30
25
20
15
10
5
0
Chum Fry
Discharge
22-Mar 29-Mar 5-Apr 12-Apr 19-Apr 26-Apr 3-May 10-May
Figure 7.Illustration of chum fry daily capture and Lower Jones Creek discharge. Mark-recapture
tests are highlighted in green at the flow recorded during release.
A total of five mark-recapture tests were carried out on lower Jones Creek throughout the
migration period. Mark-recaptures were performed at early, peak and late out-migration timing
and at a variety of flows. The first two tests were carried out in the single trap configuration and
had capture efficiencies of 0.113 and 0.065 respectively (Table 7). The final three tests were
done in the dual trap configuration and had a much higher capture efficiency (0.565, 0.336, and
0.193 respectively).
Lower Jones Creek Fish Productivity Monitoring 2008-2009 18
6
5
4
3
2
1
0
Discharge cms