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Volume 2012/13, Issue 14
| May 14, 2013 |
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International Congress for Conservation Biology
July 21-25
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Key Highlights
April 22, 2013 - May 5, 2013
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 7 O. mykiss were captured, increasing the season total to 208.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 519 Chinook salmon were captured, increasing the season total to 145,911. 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 152 Chinook salmon were captured, increasing the season total to 3,088. Monitoring continued at Grayson (RM 5) and 8 Chinook salmon were captured, increasing the season total to 33.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 144 Chinook salmon were captured, increasing the season total to 51,549. Monitoring continued at Golf (RM 38) and a total of 157 Chinook salmon were captured, increasing the season total to 2,308. Monitoring continued at the Bypass trap (RM 38) and a total of 1,466 Chinook salmon were captured, increasing the season total to 1,551.
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 979 Chinook salmon were captured, increasing the season total to 3,031.
Tuolumne River Weir Monitoring continued with a total of 21 Chinook salmon passing upstream through the weir between April 22 and May 5, increasing the total to 2,279.
San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 2,678 cfs to 4,176 cfs. Daily average water temperature in the San Joaquin River ranged from 60.9�F to 64.5�F at Vernalis, and from 62.7�F to 65.8�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.2 mg/L to 10.0 mg/L at Mossdale, and from 7.0 mg/L to 8.7 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 1,627 cfs to 4,278 cfs.
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2012/13 Calaveras River Juvenile Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 28) operated eight days between April 22 and May 5 and a total of 7 O. mykiss were captured, increasing the season total to 208. Daily catches ranged from 0 to 2 individuals (Figure 1), and of the O. mykiss captured 6 were YOY (<100 mm) and rated parr and 1 was Age 1+ (100-299 mm) and rated as smolt. Average forklengths and weights of O. mykiss are provided in Table 1. A total of 61 Chinook salmon were captured and rated as parr (n=10) and smolt (n=51), increasing the season total to 67. Instantaneous temperature recorded at the trap ranged from 53.4�F to 57.6�F, and turbidity ranged from 0.36 NTU to 1.77 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 125 cfs and 204 cfs, and at Bellota (MRS) flow fluctuated between 27 cfs and 62 cfs (Figure 1). Table 1. Biosampling data for O. mykiss captured at Shelton Road between April 22 and May 5, 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 519 Chinook salmon were captured, increasing the season total to 145,911. Most of the Chinook salmon measured were smolt (n=327), but fry (n=1) and parr (n=111) were also observed (Table 2).
One O. mykiss was captured during the reporting period, increasing the season total to 32.
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between April 22 and May 5, 2013. Parentheses indicate range.
Instantaneous temperature recorded at the trap ranged from 52.0�F to 60.4�F, and turbidity ranged from 0.44 NTU to 2.05 NTU. Daily average flow at Goodwin Dam (GDW) increased from 2,690 cfs to 3,026 cfs, and flow ranged from 1,396 cfs to 2,839 cfs at Ripon (RIP) (Figure 2).
No trap efficiency evaluations were conducted during the reporting period.
 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 152 Chinook salmon were captured, increasing the season total to 3,088. Most of the measured fish were smolt (n=91) but fry (n=6) and parr (n=2) were also observed (Table 3).
Instantaneous temperature recorded at the trap ranged from 57.7�F to 61.3�F, and turbidity ranged from 0.35 NTU to 2.16 NTU. Daily average flow at La Grange (LGN) ranged between 572 cfs and 1,190 cfs (Figure 3).
No trap efficiency evaluations were conducted during the reporting period. Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between April 22 and May 5, 2013. Parentheses indicate range. 
Figure 3. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded at La Grange (LGN) between January 1 and May 5, 2013.
 Tuolumne River rotary screw trap monitoring at Grayson (RM 5) continued during the reporting period and 8 Chinook salmon were captured, increasing the season total to 33. All Chinook salmon captured were smolt (Table 4).
Instantaneous temperature taken at the trap ranged from 61.7�F to 67.4�F, and turbidity ranged from 1.69 NTU to 9.03 NTU. Daily average flow at Modesto (MOD) ranged between 685 cfs and 1,170 cfs (Figure 5).
No trap efficiency evaluations were conducted during the reporting period.
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between April 22 and May 5, 2013. Parentheses indicate range.
Figure 4. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at Modesto (MOD) between January 1 and May 5, 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 144 juvenile Chinook salmon were captured, increasing the season total to 51,549.
A total of 8 O. mykiss were captured, increasing the season total to 195.
Average daily flow from Camanche Reservoir (CMN) ranged from 340 cfs to 386 cfs (Figure 5). Instantaneous temperature ranged between 52.7�F and 56.5�F, and instantaneous turbidity ranged between 1.22 NTU and 2.24 NTU.
Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2012, and May 5, 2013.
The Mokelumne River rotary screw trap at Golf (RM 38) continued sampling intermittently during the reporting period. A total of 157 juvenile Chinook salmon were captured, increasing the season total to 2,308.
No O. mykiss were captured during the reporting period.
Average daily flow from Woodbridge Dam (WBR) ranged from 116 cfs to 119 cfs (Figure 6). Instantaneous temperature ranged between 62.1�F and 64.0�F, and instantaneous turbidity ranged between 1.77 NTU and 2.50 NTU.
Figure 6. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between December 15, 2012, and May 5, 2013.
T he Mokelumne RiverBypass trap(RM 38) continued sampling during the reporting period. A total of 1,466 Chinook salmon were captured, increasing the season total to 1,551. One O. mykiss (212 mm) was captured during the reporting period, increasing the season total to two. Daily average flows recorded at Woodbridge (WBR) ranged from 116 cfs to 119 cfs (Figure 7). Instantaneous water temperatures ranged between 62.4�F and 64.9�F, and turbidity ranged between 1.74 NTU and 3.13 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 May 5, 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 conductedbetween April 22 and May 5. A total of 979 juvenile Chinook salmon were captured, increasing the season total to 3,031. Catch ranged between 3 and 408 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 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 5. Annual Fall-run Chinook passage prior to May 5, 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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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis ranged from 2,678 cfs to 4,176 cfs (Figure 13). Water temperature in the San Joaquin River ranged from 60.9�F to 64.5�F at Vernalis, from 62.7�F to 65.8�F at Mossdale, and from 66.5�F to 68.7�F at Rough 'n Ready Island (Figure 14). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.0 mg/L to 8.7 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 9.2 mg/L to 10.0 mg/L at Mossdale (Figure 15).
Figure 13. San Joaquin River flow at Vernalis from May 1, 2012, through May 5, 2013.
Figure 14. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from May 1, 2012, through May 5, 2013.
Figure 15. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from May 1, 2012, through May 5, 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 810 cfs to 3,155 cfs (Figure 16). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 810 cfs to 3,279 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,627 cfs to 4,278 cfs.
Figure 16. Daily exports at the state and federal pumping stations from May 1, 2012, through May 5, 2013.
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