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Volume 2012/13, Issue 13
| April 30, 2013 |
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International Congress for Conservation Biology
July 21-25
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Key Highlights
April 1, 2013 - April 21, 2013
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 31 O. mykiss were captured, increasing the season total to 201.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 11,187 Chinook salmon were captured, increasing the season total to 145,392. Monitoring data is unavailable at Caswell Memorial State Park (RM 9) during the reporting period.
Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30) and a total of 349 Chinook salmon were captured, increasing the season total to 2,936. Monitoring continued at Grayson (RM 5) and 22 Chinook salmon were captured, increasing the season total to 25.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 81 Chinook salmon were captured, increasing the season total to 51,405. Monitoring continued at Golf (RM 38) and a total of 38 Chinook salmon were captured, increasing the season total to 2,151. Monitoring at the Bypass trap (RM 38) began during the reporting period and a total of 85 Chinook salmon were captured.
San Joaquin River Juvenile Migration Monitoring. On April 2 the California Department of Fish and Game (CDFG) initiated Kodiak Trawling on the San Joaquin River near Mossdale and 1,972 Chinook salmon were captured during the reporting period.
Stanislaus River Weir Monitoring ended on April 22 and one Chinook salmon passed upstream through the weir on April 11, increasing the season total to 7,158.
Tuolumne River Weir Monitoring continued with a total of 27 Chinook salmon passing upstream through the weir between April 1 and April 21, increasing the total to 2,258.
San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 1,253 cfs to 2,545 cfs. Daily average water temperature in the San Joaquin River ranged from 59.9�F to 68.1�F at Vernalis, and from 60.8�F to 69.0�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.3 mg/L to 13.1 mg/L at Mossdale, and from 7.1 mg/L to 8.3 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 1,279 cfs to 2,314 cfs.
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2012/13 Calaveras River Juvenile Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 28) operated thirteen days between April 1 and April 21 and a total of 31 O. mykiss were captured,  increasing the season total to 201. Daily catches ranged from 0 to 6 individuals (Figure 1), and of the O. mykiss captured 24 were YOY (<100 mm) and rated as fry (n=16) and parr (n=8) and 7 were Age 1+ (100-299 mm) and were rated as silvery parr (n=1) and smolt (n=4). Average forklengths and weights of O. mykiss are provided in Table 1. One Chinook salmon fry (44 mm) and one Chinook salmon parr (65 mm) were captured during this reporting period, increasing the season total to six. Instantaneous temperature recorded at the trap ranged from 52.9�F to 64.5�F, and turbidity ranged from 0.17 NTU to 1.14 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 68 cfs and 189 cfs, and at Bellota (MRS) flow fluctuated between 15 cfs and 34 cfs (Figure 1). Table 1. Biosampling data for O. mykiss captured at Shelton Road between April 1 and April 21, 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 11,187 Chinook salmon were captured, increasing the season total to 145,392. Most of the Chinook salmon measured were parr (n=1,074), but fry (n=40) and smolt (n=271) were also observed (Table 2).
Seven O. mykiss were captured during the reporting period, increasing the season total to 31. The majority of these were fry (Table 2).
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between April 1 and April 21, 2013. Parentheses indicate range.
Instantaneous temperature recorded at the trap ranged from 51.0�F to 68.1�F, and turbidity ranged from 0.76 NTU to 3.04 NTU. Daily average flow at Goodwin Dam (GDW) increased from 203 cfs to 1,507 cfs, and flow ranged from 320 cfs to 1,328 cfs at Ripon (RIP) (Figure 2).
Five trap efficiency evaluations were conducted during the reporting period with natural 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 April 1 and April 21, 2013.
 Figure 2. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) in 2013. Data is unavailable for the Stanislaus River rotary screw traps at Caswell Memorial State Park (RM 9) during the reporting period.
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2013 Tuolumne River Juvenile Migration Monitoring
Tuolumne River rotary screw trap monitoring at Waterford (RM 30) continued during the reporting period and a total of 349 Chinook salmon were captured, increasing the season total to 2,936. Most of the measured fish were smolt (n=250) but parr (n=25) were also observed (Table 4).
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between April 1 and April 21, 2013. Parentheses indicate range.
Instantaneous temperature recorded at the trap ranged from 53.3�F to 66.9�F, and turbidity ranged from 0.25 NTU to 4.25 NTU. Daily average flow at La Grange (LGN) was stable between 167 cfs and 773 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 April 21, 2013.
 Tuolumne River rotary screw trap monitoring at Grayson (RM 5) continued during the reporting period and 22 Chinook salmon were captured, increasing the season total to 25. All Chinook salmon captured were smolt (Table 5).
Instantaneous temperature taken at the trap ranged from 57.9�F to 66.7�F, and turbidity ranged from 1.85 NTU to 10.61 NTU. Daily average flow at Modesto (MOD) ranged between 217 cfs and 601 cfs (Figure 5).
No trap efficiency evaluations were conducted during the reporting period.
Table 5. Biosampling data for Chinook salmon captured and measured at Waterford between April 1 and April 21, 2013. Parentheses indicate range.
Figure 4. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at Modesto (MOD) between January 1 and April 21, 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 81 juvenile Chinook salmon were captured, increasing the season total to 51,405.
A total of 86 O. mykiss were captured, increasing the season total to 187.
Average daily flow from Camanche Reservoir (CMN) ranged from 276 cfs to 342 cfs (Figure 5). Instantaneous temperature ranged between 50.9�F and 54.7�F, and instantaneous turbidity ranged between 1.18 NTU and 2.47 NTU.
Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2012, and April 21, 2013.
The Mokelumne River rotary screw trap at Golf (RM 38) continued sampling intermittently during the reporting period. A total of 38 juvenile Chinook salmon were captured, increasing the season total to 2,151.
One O. mykiss (184 mm) was captured during the reporting period.
Average daily flow from Woodbridge Dam (WBR) ranged from 115 cfs to 168 cfs (Figure 6). Instantaneous temperature ranged between 57.6�F and 61.0�F, and instantaneous turbidity ranged between 1.57 NTU and 3.32 NTU.
Figure 6. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between December 15, 2012, and April 21, 2013.
The Mokelumne River Bypass trap (RM 38) began on April 2 and sampled intermittently through April 21 and a total of 85 Chinook salmon were captured.
One O. mykiss (194 mm) was captured during the reporting period. Daily average flows recorded at Woodbridge (WBR) ranged from 115 cfs to 168 cfs (Figure 7). Instantaneous water temperatures ranged between 58.1�F and 61.5�F, and turbidity ranged between 1.65 NTU and 2.89 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 April 21, 2013.
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2012/13 San Joaquin River Juvenile Migration Monitoring
On April 2 the California Department of Fish and Wildlife initiated Kodiak Trawling on the San Joaquin River near Mossdale (i.e. the Mossdale Trawl). Fourteen days (ten tows per day) of trawling were conducted between April 2 and April 21. A total of 1,972 juvenile Chinook salmon were captured. Catch ranged between 37 and 504 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
Due to an increase in releases from Goodwin Dam that exceeded 1,500 cfs, monitoring at the Stanislaus River weir ended on April 22. Data have been reviewed through April 15 and one Chinook salmon was detected by the Vaki Riverwatcher on April 11.The total passage to-date of 7,158 is the highest observed at the Stanislaus weir since monitoring began in 2003 (Figure 9; Table 6).
Three O. mykiss were detected passing upstream, increasing the season total to 88.
Instantaneous water temperature measured at the weir ranged between 52.0˚F and 68.9˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 56.7˚F and 64.8˚F (Figure 10). Instantaneous turbidity ranged between 0.84 NTU and 4.24 NTU (Figure 11). Instantaneous dissolved oxygen at the weir ranged between 8.05 mg/L and 12.40 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 8.09 mg/L to 9.96 mg/L (Figure 12).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) increased from 203 cfs to 1,507 cfs. Flows at Ripon (RIP; RM 15) increased from 320 cfs to 1,328 cfs. Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation, and other factors.
Table 6. Annual fall-run Chinook passage at the Stanislaus River weir prior to April 21, 2003-2013.
  Figure 9. Daily upstream Chinook passage at the Stanislaus River weir in relation to daily average flows (cfs) recorded in the Stanislaus River at Goodwin (GDW) and Ripon (RIP), 2012/13. Figure 10. Daily upstream Chinook passage recorded at the Stanislaus River weir in relation to instantaneous water temperature recorded at the weir, and daily average water temperature recorded in the Stanislaus River at Ripon (RPN), 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 Stanislaus River weir in relation to instantaneous turbidity recorded at the weir in 2012/13. (Note: Turbidity on December 24 was measured at 106.0 NTU.) Figure 12. Daily upstream Chinook passage at the Stanislaus River weir in relation to instantaneous dissolved oxygen recorded at the weir, and daily average dissolved oxygen recorded in the Stanislaus River at Ripon (RPN), and 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
B etween April 1 and April 21 a total of 27 Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Tuolumne River weir. Total passage to-date of 2,258 is less than the 2,883 passages observed in 2011 at the Tuolumne weir (Table 7). Daily passage, ranged between 0 and 4 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 ranged from 167 cfs to 773 cfs at La Grange (LGN; RM 50) and 217 cfs and 601 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 59.5˚F and 69.6˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 60.1˚F and 68.7˚F (Figure 14). Instantaneous turbidity ranged between 1.32 NTU and 8.32 NTU (Figure 15), and instantaneous dissolved oxygen ranged between 8.95 mg/L and 10.95 mg/L (Figure 16)
Table 7. Annual Fall-run Chinook passage prior to April 21, 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 ranged from 1,253 cfs to 2,545 cfs (Figure 17). Water temperature in the San Joaquin River ranged from 59.9�F to 68.1�F at Vernalis, from 60.8�F to 69.0�F at Mossdale, and from 63.5�F to 66.0�F at Rough 'n Ready Island (Figure 18). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.1 mg/L to 8.3 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 9.3 mg/L to 13.1 mg/L at Mossdale (Figure 19).
Figure 17. San Joaquin River flow at Vernalis from April 1, 2012, through April 21, 2013.
Figure 18. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from April 1, 2012, through April 21, 2013.
Figure 19. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from April 1, 2012, through April 21, 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 0 cfs to 866 cfs (Figure 20). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 688 cfs to 1,504 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,279 cfs to 2,314 cfs.
Figure 20. Daily exports at the state and federal pumping stations from April 1, 2012, through April 21, 2013.
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