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Volume 2012/13, Issue 16
| June 18, 2013 |
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International Congress for Conservation Biology
July 21-25
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Key Highlights
May 20, 2013 - June 9, 2013
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 61 O. mykiss were captured, increasing the season total to 304.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 586 Chinook salmon were captured, increasing the season total to 150,056. Monitoring at Caswell Memorial State Park (RM 9) continued between May 20 and June 9 and a total of 511 Chinook salmon were captured, increasing the season total to 18,319.
Tuolumne River Juvenile Migration Monitoring ended at Waterford (RM 30) on May 31 and no Chinook salmon were captured. The season total remains at 3,106. Monitoring ended at Grayson (RM 5) on May 23 and no Chinook salmon were captured. The season total remains at 35.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 52 Chinook salmon were captured, increasing the season total to 51,698. Monitoring ended at Golf (RM 38) on May 24 and a total of 158 Chinook salmon were captured, increasing the season total to 2,744. Monitoring continued at the Bypass trap (RM 38) and a total of 10,775 Chinook salmon were captured, increasing the season total to 35,058.
San Joaquin River Juvenile Migration Monitoring. The California Department of Fish and Wildlife (CDFW) continued Kodiak Trawling surveys on the San Joaquin River near Mossdale and 842 Chinook salmon were captured, increasing the season total to 5,468.
Stanislaus River Weir Monitoring resumed on May 23 and 56 Chinook salmon passed upstream through the weir, increasing the season total to 7,195.
Tuolumne River Weir Monitoring ended on May 23 and a total of 2 Chinook salmon passed upstream through the weir, increasing the total to 2,302.
San Joaquin River Conditions. San Joaquin River flow at Vernalis decreased from 1,278 cfs to 809 cfs. Daily average water temperature in the San Joaquin River ranged from 66.6�F to 79.0�F at Vernalis, and from 67.2�F to 80.1�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 11.2 mg/L to 16.0 mg/L at Mossdale, and from 7.5 mg/L to 8.1 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island).
Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period, ranging from 1,185 cfs to 2,294 cfs.
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2012/13 Calaveras River Juvenile Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 28) operated eleven days between May 20 and June 9 and a total of 61 O. mykiss were captured, increasing the season total to 304. Daily catches ranged from 0 to 11 individuals (Figure 1), and  most of the O. mykiss captured were YOY (<100 mm) and rated parr (n=30) and silvery parr (n=13), but Age 1+ (100-299 mm) were also observed and rated as parr (n=2), silvery parr (n=8) and smolt (n=2). Average forklengths and weights of O. mykiss are provided in Table 1. A total of 150 Chinook salmon were captured and rated as smolt (n=131), increasing the season total to 418. Instantaneous temperature recorded at the trap ranged from 54.1�F to 62.6�F, and turbidity ranged from 0.26 NTU to 1.77 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 144 cfs and 229 cfs, and at Bellota (MRS) flow fluctuated between 33 cfs and 60 cfs (Figure 1). Table 1. Biosampling data for O. mykiss captured at Shelton Road between May 20 and June 9, 2013. Parenthesis indicates range. 
Figure 1. Daily O. mykiss catch at Shelton Road, and Calaveras River flow recorded by New Hogan Dam (NHG) and Cosgrove Creek (COS) combined and flow recorded at Bellota (MRS), in 2012 and 2013.
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2013 Stanislaus River Juvenile Migration Monitoring
 Stanislaus River rotary screw trap monitoring at Oakdale (RM 40) continued during the reporting period and a total of 586 Chinook salmon were captured, increasing the season total to 150,056. Most of the Chinook salmon measured were smolt (n=580), but parr (n=2) were also observed (Table 2).
Four O. mykiss were captured during the reporting period, increasing the season total to 47.
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between May 20 and June 9, 2013. Parentheses indicate range.
Instantaneous temperature recorded at the trap ranged from 57.3�F to 64.7�F, and turbidity ranged from 0.43 NTU to 1.23 NTU. Daily average flow at Goodwin Dam (GDW) ranged from 252 cfs to 373 cfs, and flow ranged from 425 cfs to 674 cfs at Ripon (RIP) (Figure 2).
One trap efficiency evaluation was conducted during the reporting period with natural (CFGN) origin juvenile Chinook salmon marked caudal fin green (CFG). Preliminary estimates of capture efficiency are provided in Table 3.
Table 3. Trap efficiency tests conducted at Oakdale between May 20 and June 9, 2013.
 Figure 2. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) in 2013. The Stanislaus River rotary screw traps at Caswell Memorial State Park (RM 9) operated twelve days during the reporting period and a total of 151 juvenile Chinook salmon smolts were captured during the reporting period, bringing the season total to 13,530 fry, 2,194 parr, 2,595 smolt and three yearling smolts. No O. mykiss were captured. The season total remains at two. Instantaneous temperature taken at the trap ranged from 62.6�F to 72.3�F, and instantaneous turbidity ranged from 3.93 NTU to 10.68 NTU. Instantaneous dissolved oxygen measured at the trap ranged from 7.65 mg/L to 8.64 mg/L.
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2013 Tuolumne River Juvenile Migration Monitoring
Tuolumne River rotary screw trap monitoring at Waterford (RM 30) ended on May 31 and no Chinook salmon were captured. The season total remains at 3,106.
Instantaneous temperature recorded at the trap ranged from 65.4�F to 72.1�F, and turbidity ranged from 0.86 NTU to 2.47 NTU. Daily average flow at La Grange (LGN) ranged from 97 cfs and 165 cfs (Figure 3).
No trap efficiency evaluations were conducted during the reporting period.
Figure 3. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded at La Grange (LGN) between January 1 and June 9, 2013.
 Tuolumne River rotary screw trap monitoring at Grayson (RM 5) ended on May 23 and no Chinook salmon were captured. The season total remains at 35.
Instantaneous temperature taken at the trap ranged from 65.1�F to 70.3�F, and turbidity ranged from 2.26 NTU to 3.48 NTU. Daily average flow at Modesto (MOD) ranged from 131 cfs to 256 cfs (Figure 5).
No trap efficiency evaluations were conducted during the reporting period.
Figure 4. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at Modesto (MOD) between January 1 and June 9, 2013.
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2012/13 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued sampling intermittently during the reporting period. A total of 52 juvenile Chinook salmon were captured, increasing the season total to 51,698.
A total of 15 O. mykiss were captured, increasing the season total to 222.
Average daily flow from Camanche Reservoir (CMN) ranged from 238 cfs to 384 cfs (Figure 5). Instantaneous temperature ranged between 54.5�F and 60.4�F, and instantaneous turbidity ranged between 1.14 NTU and 2.42 NTU.
Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2012, and June 9, 2013.
The Mokelumne River rotary screw trap at Golf (RM 38) ended sampling on May 24. A total of 158 juvenile Chinook salmon were captured, increasing the season total to 2,744.
No O. mykiss were captured during the reporting period.
Average daily flow from Woodbridge Dam (WBR) decreased from 118 cfs to 34 cfs (Figure 6). Instantaneous temperature ranged between 62.2�F and 64.6�F, and instantaneous turbidity ranged between 2.02 NTU and 2.39 NTU.
Figure 6. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between December 15, 2012, and June 9, 2013.
T he Mokelumne River Bypass trap (RM 38) continued sampling during the reporting period. A total of 10,775 Chinook salmon were captured, increasing the season total to 35,058.
83 O. mykiss were captured during the reporting period, increasing the season total to 95.
Daily average flows recorded at Woodbridge (WBR) decreased from 118 cfs to 34 cfs (Figure 7). Instantaneous water temperatures ranged between 62.6�F and 69.6�F, and turbidity ranged between 1.57 NTU and 2.94 NTU. Figure 7. Daily juvenile Chinook catch at the Bypass trap (RM 38) and daily average Mokelumne River flows at Woodbridge (WBR), between April 1, 2013, and June 9, 2013.
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2012/13 San Joaquin River Juvenile Migration Monitoring
The California Department of Fish and Wildlife continued Kodiak Trawling surveys on the San Joaquin River near Mossdale (i.e. the Mossdale Trawl). Ten days (ten tows per day) of trawling were conducted between May 20 and June 9. A total of 842 juvenile Chinook salmon were captured, increasing the season total to 5,468. Catch ranged between 0 and 457 Chinook per 10 tows (Figure 8). 
Figure 8. Chinook salmon catch (per 10 tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2013.
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2012 Stanislaus River Weir Adult Migration Monitoring
M onitoring at the Stanislaus River weir resumed on May 23 and a total of 56 Chinook salmon were detected by the Vaki Riverwatcher. The total Chinook salmon passage to-date increased to 7,195 (Figure 9; Table 4).
Seven O. mykiss were detected passing upstream, increasing the season total to 99.
Instantaneous water temperature measured at the weir ranged between 62.4˚F and 73.0˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 64.2˚F and 74.2˚F (Figure 10). Instantaneous turbidity ranged between 0.55 NTU and 1.99 NTU (Figure 11). Instantaneous dissolved oxygen at the weir ranged between 9.08 mg/L and 11.69 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 7.38 mg/L to 8.41 mg/L (Figure 12).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) increased from 252 cfs to 373 cfs. Flows at Ripon (RIP; RM 15) increased from 425 cfs to 674 cfs. Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation, and other factors.
Table 4. Annual Fall-run Chinook passage prior to June 9, 2009 - 2013.
Figure 9. Daily upstream Chinook passage at the Tuolumne River Weir in relation to daily average flows (cfs) recorded in the Tuolumne River at La Grange (LGN) and Modesto (MOD), and in the San Joaquin River at Vernalis (VNS) in 2012/13.
Figure 10. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous water temperature recorded at the weir, and daily average water temperature recorded in the Tuolumne River at Modesto (MOD) and in the San Joaquin River at Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI) in 2012/13.
Figure 11. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2012/13.
Figure 12. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous dissolved oxygen recorded at the weir, and daily average dissolved oxygen recorded in the San Joaquin River at Mossdale (MSD) and Rough & Ready (RRI) in 2012/13.
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2012 Tuolumne River Weir Adult Migration Monitoring
M onitoring at the Tuolumne River weir ended on May 23. Two Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Tuolumne River weir. Total Chinook salmon passage to-date is 2,302 at the Tuolumne weir (Table 5). Daily passage ranged between 0 and 2 Chinook salmon (Figure 13).
No O. mykiss were detected during the reporting period. The season total remains at three.
Daily average flow in the Tuolumne River decreased from 165 cfs to 97 cfs at La Grange (LGN; RM 50) and 256 cfs to 131 cfs at Modesto (MOD; RM 17). Note: flows downstream of La Grange may be higher than dam releases due to accretion and Dry Creek inflow.
Instantaneous water temperature measured at the weir ranged between 68.9˚F and 74.3˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 70.0˚F and 83.1˚F (Figure 14). Instantaneous turbidity ranged between 0.91 NTU and 1.36 NTU (Figure 15), and instantaneous dissolved oxygen ranged between 8.74 mg/L and 8.98 mg/L (Figure 16).
Table 5. Annual Fall-run Chinook passage prior to June 9, 2009 - 2013.
Figure 13. Daily upstream Chinook passage at the Tuolumne River Weir in relation to daily average flows (cfs) recorded in the Tuolumne River at La Grange (LGN) and Modesto (MOD), and in the San Joaquin River at Vernalis (VNS) in 2012/13.
Figure 14. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous water temperature recorded at the weir, and daily average water temperature recorded in the Tuolumne River at Modesto (MOD) and in the San Joaquin River at Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI) in 2012/13.
Figure 15. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2012/13.
Figure 16. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous dissolved oxygen recorded at the weir, and daily average dissolved oxygen recorded in the San Joaquin River at Mossdale (MSD) and Rough & Ready (RRI) in 2012/13.
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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis decreased from 1,278 cfs to 809 cfs (Figure 17). Water temperature in the San Joaquin River ranged from 66.6�F to 79.0�F at Vernalis, from 67.2�F to 80.1�F at Mossdale, and from 68.7�F to 75.5�F at Rough 'n Ready Island (Figure 18). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.5 mg/L to 8.1 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 11.2 mg/L to 16.0 mg/L at Mossdale (Figure 19).
Figure 17. San Joaquin River flow at Vernalis from June 1, 2012, through June 9, 2013.
Figure 18. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from June 1, 2012, through June 9, 2013.
Figure 19. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from June 1, 2012, through June 9, 2013.
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Delta Exports
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 806 cfs to 822 cfs (Figure 16). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 375 cfs to 1,481 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,185 cfs to 2,294 cfs.
Figure 20. Daily exports at the state and federal pumping stations from June 1, 2012, through June 9, 2013.
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