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

Daily Coho Smolt Capture .
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3/26/2009 3/31/2009 4/5/2009 4/10/2009 4/15/2009 4/20/2009
Figure 10 Coho smolt daily capture in Lorenzetti Creek, 2009.
Table 9 Lorenzetti Creek coho smolt capture records 2005-2009.
Year Coho Smolts Days Trapping Last Trap Day Mean Fork Length # Smolts Per Trap Day
2005 35 15 24‐Apr 73.3 2.3
2006 154 30 30‐Apr 78.9 5.1
2007 101 15 17‐Apr 74.4 6.7
2008 75 35 7‐May 72.0 2.1
2009 123 28 22‐Apr 68.1 4.4
4.8.1 Temperature and Accumulated Thermal Units
Mean daily water temperatures and ATU from Sept 15, 2009 (start of spawning) to May 14,
2009 (end of trapping) are shown in Figure 13. ATU for the fry trapping period ranged from 713-
854 for chum. The predicted peak emergence period for pink using 900-950 ATUs was from
May 2- May 11, this did not match the observed peak of April 15-April 23, however the observed
peak for Lorenzetti cannot be considered accurate because the trap was removed before
emergence was complete. Daily capture of chum fry was increasing when the trap was
removed on April 23, 2009. For chum fry the predicted peak emergence of May 2 – May 11, was
two or three weeks after the trap had been removed.
Lower Jones Creek Fish Productivity Monitoring 2008-2009 22