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Volume 2013/14, Issue 15
| June 3, 2014 |
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Bay-Delta TourJune 18-20
Annual Symposium of the Fisheries Society of the British Isles
July 7-10
Joint Meeting of Ichthyologists & Herpetologists
July 30 - August 3
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Key Highlights
April 21, 2014 - May 25, 2014
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 89 O. mykiss were captured, increasing the season total to 1,082.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 1,399 Chinook salmon were captured, increasing the season total to 80,436. No data were available for juvenile migration monitoring at Caswell Memorial State Park (RM 9) during the reporting period.
Tuolumne River Juvenile Migration Monitoring ended at Waterford (RM 30) on May 16 and a total of 64 Chinook salmon were captured, increasing the season total to 12,332. Monitoring at Grayson (RM 5) ended on May 2 and a total of 5 Chinook salmon were captured, increasing the season total to 8.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 750 Chinook salmon were captured, increasing the season total to 28,152. Monitoring continued at Golf (RM 38) and a total of 386 Chinook salmon were captured, increasing the season total to 1,336. Monitoring continued at the Bypass trap (RM 38) and a total of 34,650 Chinook salmon were captured, increasing the season total to 35,088.
San Joaquin River Juvenile Migration Monitoring on the San Joaquin River continued the kodiak trawling surveys near Mossdale and 911 Chinook salmon were captured, increasing the season total to 1,501.
Tuolumne River Adult Migration Monitoring on the Tuolumne River ended on May 7 and 3,743 Chinook salmon passed upstream through the weir during the 2013/14 season.
San Joaquin River Conditions. San Joaquin River flow at Vernalis decreased from 3,035 cfs to 2,143 cfs. Daily average water temperature in the San Joaquin River ranged from 58.5�F to 62.7�F at Vernalis, and from 59.3�F to 64.7�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.1 mg/L to 11.4 mg/L at Mossdale, and from 7.7 mg/L to 9.2 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island).
Delta Exports. Combined total exports (state and federal pumps) decreased during the reporting period, ranging from 3,150 cfs to 934 cfs.
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2013/14 Calaveras River Juvenile Migration Monitoring
SEWD rotary screw trap monitoring on the Calaveras River at Shelton Road (RM 28) operated 22 days between April 21 and May 25, and a total of 89 O. mykiss were captured, increasing  the season total to 1,082. Daily catches ranged from 1 to 8 individuals (Figure 1). Most O. mykiss captured were young-of-year and rated as fry (n=13) and parr (n=68), but Age 1+ (100-299 mm) were also observed and were rated as parr (n=2), silvery parr (n=3) and smolt (n=1). Average forklengths and weights of O. mykiss are provided in Table 1.
No Chinook salmon were captured and the season total remains at 11.
Instantaneous temperatures recorded at the trap ranged from 54.4�F to 60.3�F, and turbidity ranged from 0.30 NTU to 2.27 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) ranged from 89 cfs to 210 cfs, and at Bellota (MRS) flow ranged between 21 cfs and 88 cfs (Figure 1).
Table 1. Biosampling data for O. mykiss captured at Shelton Road between April 21, 2014 and May 25, 2014. Parentheses indicate range.
Figure 1. For Nov. 2013 to March 2014: daily O. mykiss catch at Shelton Road (red), Calaveras River flow recorded by New Hogan Dam and Cosgrove Creek combined (blue), and flow recorded at Bellota (green).
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2014 Stanislaus River Juvenile Migration Monitoring
OID, SSJID and TDP rotary screw trap monitoring on the Stanislaus River at Oakdale (RM 40) continued, and a total of 1,399 Chinook salmon were captured, increasing the season total to 80,436.  Average forklengths and weights of all Chinook salmon are provided in Table 2. Most of the fish measured were smolt (n=776), but parr (n=268) were also captured.
Three O. mykiss was captured during the reporting period, increasing the season total to 33.
Instantaneous temperatures recorded at the trap ranged from 53.4�F to 58.2�F, and instantaneous turbidity ranged from 0.74 NTU to 2.78 NTU. Daily average flow at Goodwin Dam (GDW) decreased from 2,599 cfs to 409 cfs, and flow decreased from 2,486 cfs to 680 cfs at Ripon (RIP) (Figure 2).
One trap efficiency evaluations was conducted during the reporting period. Preliminary estimates of capture efficiency was 3.7% at flows of 602 cfs (Table 3). A total of 26 trap efficiency evaluations have been conducted this season.
Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between April 21 and May 25, 2014. Parentheses indicate range.
 Table 3. Trap efficiency tests conducted at Oakdale between April 21 and May 25, 2014.
Figure 2. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam and Ripon, in 2013/2014.
No data were available for the U.S. Fish and Wildlife Service juvenile migration monitoring at Caswell Memorial State Park (RM 9) during the reporting period.
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2014 Tuolumne River Juvenile Migration Monitoring
MID and TID rotary screw trap monitoring on the Tuolumne River at Waterford (RM 30) continued and a total of 64 Chinook salmon were captured, increasing the season total to 12,332.  Average forklengths and weights of all Chinook salmon are provided in Table 4. Most of the fish measured were smolt (n=45), but parr (n=19) were also measured.
No O. mykiss were captured during the reporting period.
Instantaneous temperature taken at the trap ranged from 56.2�F to 72.3�F, and turbidity ranged from 0.81 NTU to 3.61 NTU. Daily average flow at La Grange (LGN) decreased from 768 cfs to 160 cfs (Figure 3).
No trap efficiency evaluations were conducted during the reporting period. A total of 20 trap efficiency evaluations have been conducted this season.
Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between April 21 and May 16, 2014. 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 25, 2014.
MID and TID rotary screw trap monitoring on the Tuolumne River at Grayson (RM 5) ended on May 2 and a total of 5 Chinook salmon were captured, increasing the season total to 8 (Table 4). Instantaneous temperatures recorded at the trap ranged from 58.2�F to 70.4�F, and turbidity ranged from 2.34 NTU to 8.79 NTU. Daily average flow at Modesto (MOD) decreased during the reporting period, ranging between 838 cfs and 184 cfs.
No trap efficiency evaluations were conducted during the reporting period. A total of 10 trap efficiency evaluations were conducted this season.
Table 4. Biosampling data for Chinook salmon captured and measured at Grayson between April 11 and May 2, 2014. Parentheses indicate range.
Figure 4. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at Modesto (MOD) between January 1 and May 25, 2014.
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2013/14 Mokelumne River Juvenile Migration Monitoring
EBMUD rotary screw trap monitoring on the Mokelumne River at Vino Farms (RM 54) continued intermittently during the reporting period. A total of 750 juvenile Chinook salmon were captured, increasing the season total to 28,152.
Average daily flow from Camanche Reservoir (CMN) ranged from 324 cfs to 369 cfs (Figure 5). Instantaneous temperatures ranged between 54.5�F and 59.7�F, and instantaneous turbidity ranged between 1.54 NTU and 2.77 NTU.
Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir between December 1, 2013, and May 25, 2014.
EBMUD rotary screw trap monitoring on the Mokelumne River at Golf (RM 38) continued sampling intermittently during the reporting period. A total of 386 Chinook salmon were captured, increasing the season total to 1,336 (Figure 6).
Instantaneous temperature ranged between 60.3�F and 68.2�F, and instantaneous turbidity ranged between 1.61 NTU and 3.30 NTU.
Figure 6 . Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Camanche Reservoir between January 1 and May 25, 2014.
EBMUD monitoring at the Bypass trap (RM 38) on the Mokelumne River continued sampling intermittently during the reporting period. A total of 34,650 Chinook salmon were captured, increasing the season total to 35,088 (Figure 7).
Instantaneous temperature ranged between 60.6�F and 68.0�F, and instantaneous turbidity ranged between 2.03 NTU and 3.60 NTU.
Figure 7. Daily juvenile Chinook catches at the Bypass trap and Mokelumne River flow recorded at Camanche Reservoir between April 1 and May 25, 2014.
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San Joaquin River Juvenile Migration Monitoring
The California Department of Fish and Wildlife continued kodiak trawling surveying on the San Joaquin River near Mossdale (i.e. the Mossdale Trawl). Twenty-five days (10 tows per day) of trawling were conducted between April 21 and May 25. A total of 911 juvenile Chinook salmon were captured, increasing the season total to 1,501. Catch ranged between 2 and 148 Chinook salmon 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), 2014.
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2013 Tuolumne River Weir Adult Migration Monitoring
MID and TID adult migration monitoring at the Tuolumne River weir (RM 24) ended on May 7 and a total of 2 Chinook salmon were detected (Figure 9). Counts are not yet available from February 13 through February 19 due to the time required to review video footage. The preliminary 2013/14 season total is 3,743 (Table 5).
No O. mykiss were detected at the Tuolumne River weir during the 2013/14 season.
Daily average flow in the Tuolumne River decreased from 768 cfs to 160 cfs at La Grange (LGN; RM 50) and 838 cfs and 195 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 58.5˚F and 73.1˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 59.5˚F and 72.3˚F. Instantaneous turbidity ranged between 0.77 NTU and 2.05 NTU, and instantaneous dissolved oxygen ranged between 8.64 mg/L and 10.33 mg/L.
Table 8. Annual Fall-run Chinook salmon passage, 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 2013.
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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis decreased from 3,035 cfs to 699 cfs (Figure 11). Water temperature in the San Joaquin River ranged from 58.5�F to 71.9�F at Vernalis, from 59.3�F to 73.6�F at Mossdale, and from 62.2�F to 71.4�F at Rough 'n Ready Island (Figure 12). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.6 mg/L to 9.2 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 7.9 mg/L to 11.4 mg/L at Mossdale (Figure 13).
Figure 10. San Joaquin River flows at Vernalis between May 1, 2013, and May 25, 2014.
Figure 11. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready between May 1, 2013, and May 25, 2014.
Figure 12. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready between May 1, 2013, and May 25, 2014.
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Delta Exports
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) decreased from 2,502 cfs to 807 cfs (Figure 14). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 0 cfs to 837 cfs. Combined total exports (state and federal pumps) during this period decreased from 3,150 cfs to 934 cfs.
Figure 13. Daily exports at the state and federal pumping stations between May 1, 2013, and May 25, 2014.
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