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Volume 2012/13, Issue 15
| May 29, 2013 |
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International Congress for Conservation Biology
July 21-25
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Key Highlights
May 6, 2013 - May 19, 2013
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 35 O. mykiss were captured, increasing the season total to 243.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 3,561 Chinook salmon were captured, increasing the season total to 149,472. Monitoring at Caswell Memorial State Park (RM 9) continued between May 6 and May 14 and a total of 168 Chinook salmon were captured, increasing the season total to 17,811.
Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30) and a total of 18 Chinook salmon were captured, increasing the season total to 3,106. Monitoring continued at Grayson (RM 5) and 2 Chinook salmon were captured, increasing the season total to 35.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 97 Chinook salmon were captured, increasing the season total to 51,646. Monitoring continued at Golf (RM 38) and a total of 278 Chinook salmon were captured, increasing the season total to 2,586. Monitoring continued at the Bypass trap (RM 38) and a total of 22,732 Chinook salmon were captured, increasing the season total to 24,283.
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 1,595 Chinook salmon were captured, increasing the season total to 4,626.
Tuolumne River Weir Monitoring continued with a total of 21 Chinook salmon passing upstream through the weir between May 6 and May 19, increasing the total to 2,300.
San Joaquin River Conditions. San Joaquin River flow at Vernalis decreased from 3,970 cfs to 1,309 cfs. Daily average water temperature in the San Joaquin River ranged from 59.9�F to 67.5�F at Vernalis, and from 61.7�F to 68.7�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.4 mg/L to 10.5 mg/L at Mossdale, and from 7.9 mg/L to 8.9 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 732 cfs to 2,084 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 May 6 and May 19 and a total of 35 O. mykiss were captured, increasing the  season total to 243. Daily catches ranged from 0 to 11 individuals (Figure 1), and all of the O. mykiss captured were YOY (<100 mm) and rated fry (n=5), parr (n=21) and silvery parr (n=7). Average forklengths and weights of O. mykiss are provided in Table 1. A total of 201 Chinook salmon were captured and rated as smolt (n=195), increasing the season total to 268. Instantaneous temperature recorded at the trap ranged from 52.0�F to 64.2�F, and turbidity ranged from 0.31 NTU to 1.62 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 145 cfs and 195 cfs, and at Bellota (MRS) flow fluctuated between 37 cfs and 53 cfs (Figure 1). Table 1. Biosampling data for O. mykiss captured at Shelton Road between May 6 and May 19, 2013. Parenthesis indicates range. One trap efficiency evaluation was 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 2.
Table 2. Trap efficiency tests conducted at Oakdale between May 6 and May 19, 2013. 
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 3,561 Chinook salmon were captured, increasing the season total to 149,472. Most of the Chinook salmon measured were smolt (n=847), but fry (n=1) and parr (n=52) were also observed (Table 3).
Eleven O. mykiss were captured during the reporting period, increasing the season total to 43.
Table 3. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between May 6 and May 19, 2013. Parentheses indicate range.
Instantaneous temperature recorded at the trap ranged from 54.0�F to 60.0�F, and turbidity ranged from 0.28 NTU to 2.24 NTU. Daily average flow at Goodwin Dam (GDW) decreased from 3,045 cfs to 308 cfs, and flow ranged from 2,923 cfs to 766 cfs at Ripon (RIP) (Figure 2).
Five trap efficiency evaluations were conducted during the reporting period with natural (CFGN) and hatchery (CFGH) origin juvenile Chinook salmon marked caudal fin green (CFG). Preliminary estimates of capture efficiency are provided in Table 4.
Table 4. Trap efficiency tests conducted at Oakdale between May 6 and May 19, 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) sampled continuously between May 6 and May 14, and a total of 168 juvenile Chinook salmon smolts were captured during the reporting period, bringing the season total to 13,530 fry, 2194 parr, 2,084 smolt and three yearling smolts. No O. mykiss were captured. Season total remains at two. Instantaneous temperature taken at the trap ranged from 55.8�F to 59.5�F, and instantaneous turbidity ranged from 2.27 NTU to 9.14 NTU. Instantaneous dissolved oxygen measured at the trap ranged from 9.56 mg/L to 11.09 mg/L.
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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 18 Chinook salmon were captured, increasing the season total to 3,106. All Chinook salmon captured were smolt (Table 5).
Instantaneous temperature recorded at the trap ranged from 58.4�F to 74.4�F, and turbidity ranged from 0.13 NTU to 2.18 NTU. Daily average flow at La Grange (LGN) decreased from 383 cfs and 161 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 May 6 and May 19, 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 19, 2013.
Tuolumne River rotary screw trap monitoring at Grayson (RM 5) continued during the reporting period and 2 Chinook salmon were captured, increasing the season total to 35. All Chinook salmon captured were smolt (Table 6).
Instantaneous temperature taken at the trap ranged from 63.8�F to 72.8�F, and turbidity ranged from 1.53 NTU to 7.00 NTU. Daily average flow at Modesto (MOD) decreased from 776 cfs to 206 cfs (Figure 5).
No trap efficiency evaluations were conducted during the reporting period.
Table 6. Biosampling data for Chinook salmon captured and measured at Waterford between May 6 and May 19, 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 19, 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 97 juvenile Chinook salmon were captured, increasing the season total to 51,646.
A total of 12 O. mykiss were captured, increasing the season total to 207.
Average daily flow from Camanche Reservoir (CMN) ranged from 381 cfs to 408 cfs (Figure 5). Instantaneous temperature ranged between 54.3�F and 58.6�F, and instantaneous turbidity ranged between 1.24 NTU and 2.26 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 19, 2013.
The Mokelumne River rotary screw trap at Golf (RM 38) continued sampling intermittently during the reporting period. A total of 278 juvenile Chinook salmon were captured, increasing the season total to 2,586.
No O. mykiss were captured during the reporting period.
Average daily flow from Woodbridge Dam (WBR) ranged from 116 cfs to 126 cfs (Figure 6). Instantaneous temperature ranged between 61.5�F and 65.3�F, and instantaneous turbidity ranged between 1.82 NTU and 3.72 NTU.
Figure 6. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between December 15, 2012, and May 19, 2013.
T he Mokelumne River Bypass trap (RM 38) continued sampling during the reporting period. A total of 22,732 Chinook salmon were captured, increasing the season total to 24,283. Ten O. mykiss were captured during the reporting period, increasing the season total to 12. Daily average flows recorded at Woodbridge (WBR) ranged from 116 cfs to 126 cfs (Figure 7). Instantaneous water temperatures ranged between 62.1�F and 65.7�F, and turbidity ranged between 1.79 NTU and 2.85 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 19, 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 6 and May 19. A total of 1,595 juvenile Chinook salmon were captured, increasing the season total to 4,626. Catch ranged between 25 and 568 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 May 6 and May 19 a total of 21 Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Tuolumne River weir. Total passage to-date of 2,300 is less than the 2,899 passages observed in 2011 at the Tuolumne weir (Table 7). Daily passage, ranged between 0 and 4 Chinook salmon (Figure 9).
No O. mykiss were detected during the reporting period. Season total remains at three.
Daily average flow in the Tuolumne River decreased from 383 cfs to 161 cfs at La Grange (LGN; RM 50) and 776 cfs to 206 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 63.3˚F and 77.1˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 62.4˚F and 75.4˚F (Figure 10). Instantaneous turbidity ranged between 0.72 NTU and 2.83 NTU (Figure 11), and instantaneous dissolved oxygen ranged between 8.12 mg/L and 9.83 mg/L (Figure 12).
Table 7. Annual Fall-run Chinook passage prior to May 19, 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 decreased from 3,970 cfs to 1,309 cfs (Figure 13). Water temperature in the San Joaquin River ranged from 59.9�F to 67.5�F at Vernalis, from 61.7�F to 68.7�F at Mossdale, and from 67.5�F to 70.3�F at Rough 'n Ready Island (Figure 14). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.9 mg/L to 8.9 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 9.4 mg/L to 10.5 mg/L at Mossdale (Figure 15).
Figure 13. San Joaquin River flow at Vernalis from May 1, 2012, through May 19, 2013.
Figure 14. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from May 1, 2012, through May 19, 2013.
Figure 15. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from May 1, 2012, through May 19, 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 983 cfs (Figure 16). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 0 cfs to 1,101 cfs. Combined total exports (state and federal pumps) during this period ranged from 732 cfs to 2,084 cfs.
Figure 16. Daily exports at the state and federal pumping stations from May 1, 2012, through May 19, 2013.
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