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Volume 2012/13, Issue 17
| July 2, 2013 |
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International Congress for Conservation Biology
July 21-25
Fish Predation Workshop
July 22-23
16th Annual Coho
Confab
August 9-11
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Key Highlights
June 10, 2013 - June 23, 2013
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 14 O. mykiss were captured, increasing the season total to 318.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 29 Chinook salmon were captured, increasing the season total to 150,085. Monitoring at Caswell Memorial State Park (RM 9) ended on June 20 and no Chinook salmon were captured. The season total remains at 18,319.
Mokelumne River Juvenile Migration Monitoring ended at Vino Farms (RM 54) on June 22 and a total of 5 Chinook salmon were captured, increasing the season total to 51,703. Monitoring continued at the Bypass trap (RM 38) and a total of 667 Chinook salmon were captured, increasing the season total to 35,725.
San Joaquin River Juvenile Migration Monitoring. The California Department of Fish and Wildlife continued Kodiak trawling surveys on the San Joaquin River near Mossdale and no Chinook salmon were captured. The season total remains at 5,468.
Stanislaus River Weir Monitoring continued with a total of 26 Chinook salmon passing upstream through the weir between June 10 and June 23, increasing the season total to 7,243.
San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 602 cfs to 851 cfs. Daily average water temperature in the San Joaquin River ranged from 70.9�F to 74.9�F at Vernalis, and from 71.3�F to 76.9�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 13.5 mg/L to 17.0 mg/L at Mossdale, and from 6.9 mg/L to 7.6 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 3,413 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 June 10 and June 23 and a total of 14 O. mykiss were captured, increasing  the season total to 318. Daily catches ranged from 0 to 3 individuals (Figure 1), and most of the O. mykiss captured were YOY (<100 mm) and rated parr (n=5) and silvery parr (n=6), but Age 1+ (100-299 mm) rated as silvery parr (n=3) were also observed. Average forklengths and weights of O. mykiss are provided in Table 1. A total of 26 Chinook salmon were captured and all were rated as smolt, increasing the season total to 444. Instantaneous temperature recorded at the trap ranged from 56.8�F to 61.3�F, and turbidity ranged from 0.50 NTU to 6.02 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 151 cfs and 235 cfs, and at Bellota (MRS) flow fluctuated between 35 cfs and 50 cfs (Figure 1). Table 1. Biosampling data for O. mykiss captured at Shelton Road between June 10 and June 23, 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 29 Chinook salmon were captured, increasing the season total to 150,085. Most of the Chinook salmon measured were smolt (n=26), but one parr was also observed (Table 2).
One O. mykiss was captured during the reporting period, increasing the season total to 48.
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between June 10 and June 23, 2013. Parentheses indicate range.
Instantaneous temperature recorded at the trap ranged from 60.0�F to 63.1�F, and turbidity ranged from 0.58 NTU to 1.89 NTU. Daily average flow at Goodwin Dam (GDW) ranged from 253 cfs to 357 cfs, and flow ranged from 382 cfs to 490 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. Stanislaus River rotary screw trap monitoring at Caswell Memorial State Park (RM 9) ended on June 20, and no Chinook salmon were captured during the reporting period. The season total remains at 13,530 fry; 2,194 parr; 2,595 smolt; and three yearling smolts. No O. mykiss were captured. The season total remains at two. Average daily flow from Ripon (RIP) ranged from 382 cfs and 490 cfs. Average daily temperature at Ripon (RPN) ranged from 69.0�F to 72.2�F, and average dissolved oxygen measured at Ripon ranged from 7.81 mg/L to 8.28 mg/L.
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2012/13 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw trap at Vino Farms (RM 54) ended sampling on June 20. A total of 5 juvenile Chinook salmon were captured, increasing the season total to 51,703.
A total of 3 O. mykiss were captured, increasing the season total to 225.
Average daily flow from Camanche Reservoir (CMN) ranged from 149 cfs to 274 cfs (Figure 3). Instantaneous temperature ranged between 57.2�F and 59.0�F, and instantaneous turbidity ranged between 1.25 NTU and 2.85 NTU.
Figure 3. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2012, and June 23, 2013.
The Mokelumne River Bypass trap (RM 38) continued sampling during the reporting period. A total of 667 Chinook salmon were captured, increasing the season total to 35,725.
30 O. mykiss were captured during the reporting period, increasing the season total to 125.
Daily average flows recorded at Woodbridge (WBR) ranged from 31 cfs to 61 cfs (Figure 4). Instantaneous water temperatures ranged between 68.5�F and 71.1�F, and turbidity ranged between 1.80 NTU and 3.25 NTU.
Figure 4. 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 23, 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). Six days (ten tows per day) of trawling were conducted between June 10 and June 23 and no Chinook salmon were captured. The season total remains at 5,468 (Figure 5). 
Figure 5. 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
Between June 10 and June 23 a total of 26 Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Stanislaus River weir, increasing the  total Chinook salmon passage to-date to 7,243 (Figure 6; Table 3).
One O. mykiss was detected passing upstream, increasing the season total to 101.
Instantaneous water temperature measured at the weir ranged between 65.6˚F and 68.5˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 69.0˚F and 72.2˚F (Figure 7). Instantaneous turbidity ranged between 0.45 NTU and 1.78 NTU (Figure 8). Instantaneous dissolved oxygen at the weir ranged between 8.17 mg/L and 10.29 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 7.81 mg/L to 8.28 mg/L (Figure 9).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) ranged from 253 cfs to 357 cfs. Flows at Ripon (RIP; RM 15) ranged from 382 cfs to 490 cfs. Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation, and other factors.
Table 3. Annual Fall-run Chinook passage prior to June 23, 2009 - 2013.
Figure 6. 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 7. 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 8. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2012/13.
Figure 9. 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 602 cfs to 851 cfs (Figure 10). Water temperature in the San Joaquin River ranged from 70.9�F to 74.9�F at Vernalis, from 71.3�F to 76.9�F at Mossdale, and from 74.3�F to 75.7�F at Rough 'n Ready Island (Figure 11). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 6.9 mg/L to 7.6 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 13.5 mg/L to 17.0 mg/L at Mossdale (Figure 12).
Figure 10. San Joaquin River flow at Vernalis from June 1, 2012, through June 23, 2013.
Figure 11. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from June 1, 2012, through June 23, 2013.
Figure 12. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from June 1, 2012, through June 23, 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 347 cfs to 816 cfs (Figure 13). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 656 cfs to 2,609 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,185 cfs to 3,413 cfs.
Figure 13. Daily exports at the state and federal pumping stations from June 1, 2012, through June 23, 2013.
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