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Volume 2010/11, Issue 14June 3, 2011
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In This Issue
Calaveras River Juvenile Migration Monitoring
Stanislaus River Juvenile Migration Monitoring
Tuolumne River Juvenile Migration Monitoring
Mokelumne River Juvenile Migration Monitoring
Merced River Conditions
San Joaquin River Juvenile Migration Monitoring
San Joaquin River Conditions
Delta Exports
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Paddle to the Sea
May 6 - June 4

Pick & Gather at the Riverdance Farms & Merced River Fair:
June 4-5
 
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Merced River Fair

 

Pacific Lamprey
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Key Highlights
April 25 - May 22, 2011

Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28), and a total of 41 O. mykiss were captured during the reporting period, bringing the season total to 662.

Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40), and a total of 75 Chinook salmon were captured during the reporting period, bringing the season total to 42,415.

Monitoring at Caswell State Park (RM 8) continued, and a total of 69 Chinook salmon were captured during the reporting period, bringing the season total to 540.

Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30), and a total of 178 Chinook salmon were captured during the reporting period, bringing the season total to 4,223.

Monitoring at Grayson (RM 5) continued during the reporting period, and a total of 100 Chinook salmon were captured, bringing the season total to 1,574.

Mokelumne River Juvenile Migration Monitoring at Vino Farms (RM 54) continued, and a total of 72 Chinook salmon and 36 O. mykiss were captured during the reporting period, bringing the season totals to 29,622 and 52, respectively.

Monitoring at Golf (RM 38) continued, and a total of 237 Chinook salmon and 17 O. mykiss were captured during the reporting period, increasing the season total to 3,488 and 30, respectively.

Merced River. No fish monitoring data were available for the reporting period.

San Joaquin River Juvenile Migration Monitoring A total of 1,454 naturally spawned juvenile Chinook salmon were captured at Mossdale during the reporting period, increasing the season total to 1,479.  

Vernalis Adaptive Management Plan (VAMP) released 480 acoustic tagged salmon to estimate smolt survival through the San Joaquin River and South Delta during May 17-21.

The Six-Year Acoustic Study released 960 acoustic tagged steelhead smolts to estimate survival through the San Joaquin River and South Delta May 3-7 and May 17-21.  

San Joaquin River Conditions. San Joaquin River flows at Vernalis decreased from 22,654 cfs to 10,049 cfs. Water temperatures in the San Joaquin River ranged from 57.1F to 64.3F at Vernalis, and from 58.1F to 65.1F at Mossdale. Average daily dissolved oxygen (DO) in the San Joaquin River ranged from 8.1 mg/L to 9.3 mg/L at Mossdale, and from 7.8 mg/L to 8.7 mg/L at Rough 'n Ready.

Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period, ranging from 2,141 cfs to 8,758 cfs.


 
2010/11 Calaveras River Juvenile Migration Monitoring


Calaveras River rotarty screw trap

Figure 1. Measuring catch at the Calaveras River rotary screw trap at Shelton Road.


The Calaveras River rotary screw trap at Shelton Road (RM 28) was operated eleven days between April 24 and May 22 and a total of 41 O. mykiss were captured, increasing the season total to 662 (Figure 1). Of the O. mykiss captured, 40 were YOY (>100 mm) and rated as fry (n=1), parr (n=37), and silvery parr (n=2), and one was Age 1+ (100-299 mm), rated as smolt (n=1). Average forklengths and weights are provided for the O. mykiss in Table 1.


No Chinook salmon have been captured this season.


Instantaneous temperature recorded at the trap ranged from 51.9F to 58.2F, and turbidity ranged from 0.79 NTU to 3.95 NTU. Daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 79 cfs and 213 cfs, and at Bellota (MRS) flow fluctuated between 14 cfs and 221 cfs (Figure 2).

No trap efficiency experiments were conducted during the reporting period.

 

Table 1. Biosampling data for O. mykiss captured at Shelton Road between April 25 and May 22, 2011. Parentheses indicate range.

Catch Table

 Catch and Flow   

Figure 2. Daily O. mykiss catch at Shelton Road, Calaveras River flow recorded at New Hogan Dam (NHG) and Cosgrove Creek (COS) combined, and flow recorded at Bellota (MRS), between November 1, 2010 and May 22, 2011.


 
2011 Stanislaus River Juvenile Migration Monitoring

Juvenile Chinook salmon

Figure 3. Juvenile Chinook salmon captured in the Stanislaus River rotary screw trap at Oakdale.

 

The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously during the reporting period. A total of 75 juvenile Chinook salmon were captured, bringing the season total to 42,415. Daily catch of Chinook salmon ranged between 0 and 12 individuals (Figure 3). Average forklengths and weights of Chinook salmon are provided in Table 2 for the 75 Chinook that were measured. Most of the measured Chinook were smolts (n=71), but parr (n=4) were also recorded.  

 

No O.mykiss were captured during the reporting period. The season total remains at 21.

 

 

Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between April 25 and May 22, 2011.

Oakdale Catch Chart  

Instantaneous temperature recorded at the trap ranged from 48.9F to 58.5F, and turbidity ranged from 0.13 NTU to 3.98 NTU (Figure 5). Daily average flow at Goodwin Dam (GDW) increased from 1,998 cfs and 2,568 cfs, and flow at Ripon (RIP) ranged from 1,972 cfs to 2,520 cfs (Figure 4).

 

No trap efficiency experiments were conducted during the reporting period.

 

 Oakdale Catch and Flow

Figure 4. Daily Chinook salmon catch at Oakdale, and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) in 2011.

 

Oakdale Catch and Turb

Figure 5. Daily Chinook salmon catch at Oakdale in relation to instantaneous turbidity recorded at the trap in 2011.

 

The Stanislaus River rotary screw trap at Caswell State Park (RM 8) sampled continuously during the reporting period and a total of 69 juvenile Chinook salmon were captured, increasing the season total to 540. Daily catch ranged between zero and eight Chinook salmon (Figure 6).

 

No O. mykiss were captured during the reporting period. The season total remains at one.

 

No trap efficiency experiments were conducted during the reporting period.

 

Instantaneous temperature recorded at the trap ranged from 52.2F and 55.9F, and turbidity ranged from 2.09 NTU to 5.65 NTU. Daily average flow at Ripon (RIP) ranged from to 1,972 cfs to 2,520 cfs.

 

Caswell Catch and Flow

Figure 6. Daily Chinook salmon catch at Caswell, and Stanislaus River flow recorded at Ripon (RIP) in 2011.


 
2010/11 Tuolumne River Juvenile Migration Monitoring

The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously during the reporting period. A total of 178 juvenile Chinook salmon were captured bringing the season total to 4,223. Daily catch ranged between zero and twenty-three Chinook. Average forklengths and weights are provided in Table 3 for 178 of the Chinook salmon. The majority of the measured Chinook were smolts (n=177), but a parr (n=1) were also recorded.

 

No O. mykiss were captured during this reporting period.

 

Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between April 25 and May 22, 2011. Parentheses indicate range.

Waterford Catch Table     

 

Instantaneous temperature taken at the trap ranged from 49.4F to 54.4F, and turbidity ranged from 0.35 NTU to 4.2 NTU. Daily average flow at La Grange (LGN) decreased from 5,780 cfs to 2,960 cfs (Figure 7).

 

No trap efficiency experiments were conducted during the reporting period.

 

 Waterford Catch and Flow

Figure 7. Daily Chinook salmon catch at Waterford, and Tuolumne River flow recorded at La Grange (LGN) and Modesto (MOD) between December 1, 2010, and May 22, 2011.

 

The Tuolumne River rotary screw traps at Grayson (RM 5) sampled continuously during the reporting period and catch at Grayson continues to be higher than during the previous two years. A total of 100 Chinook salmon were captured, bringing the season total to 1,574. Average forklengths and weights of all Chinook salmon are provided in Table 4. The majority of the salmon were smolt (n=99), but one parr (n=1) was also observed.

 

No O. mykiss were captured during this reporting period.

 

Table 4. Biosampling data for Chinook salmon captured and measured at Grayson between April 25 and May 22, 2011. Parentheses indicate range.

Grayson Catch Table 

Instantaneous temperature taken at the trap ranged from 53.1F to 58.2F, and turbidity ranged from 1.15 NTU to 6.69 NTU. Daily average flow at Modesto (MOD) decreased from 5,860 cfs to 3,270 cfs (Figure 8).

 

No trap efficiency experiments were conducted during the reporting period.

 

 Grayson Catch and Flow

Figure 8. Daily Chinook salmon catch at Grayson, and Tuolumne River flow recorded at La Grange (LGN) and Modesto (MOD) between January 1 and May 22, 2011.



2010/11 Mokelumne River Juvenile Migration Monitoring

The Mokelumne River rotary screw trap at Vino Farms (RM 54) was sampled intermittently, and a total of 72 juvenile Chinook salmon were captured during the reporting period, bringing the season total to 29,622.

Average daily flow from Camanche Reservoir (CMN) decreased from 3,003 cfs to 2,100 cfs (Figure 9). Instantaneous temperature ranged from 50.9F to 54.3F, and instantaneous turbidity ranged between 2.18 NTU and 4.87 NTU.

A total of 36 O. mykiss were captured during the reporting period, increasing the season total to 52.  

 

Vino Catch and Flow

Figure 9. Daily juvenile Chinook catch at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2010, and May 22, 2011.

The Mokelumne River rotary screw trap at Golf (RM 38) continued intermittent monitoring during the reporting period and a total of 237 juvenile Chinook salmon were captured, increasing the season total to 3,488.

Average daily flow at Woodbridge Dam (WBR) decreased from 2,658 cfs to 1,813 cfs (Figure 10). Instantaneous temperature ranged between 51.8F and 56.1F, and instantaneous turbidity ranged between 3.42 NTU and 5.13 NTU.

A total of seventeen O. mykiss were captured during the reporting period increasing the season total to 30.  

 

Golf Catch and Flow

Figure 10. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between January 1 and May 22, 2011.


 
Merced River Conditions

Flow in the Merced River at Cressy (CRS; RM 52) fluctuated between 1,639 cfs and 2,984 cfs during reporting period. Flow at Stevinson (MST; RM 5) fluctuated between 1,469 cfs and 2,766 cfs (Figure 11). Water temperatures in the Merced River ranged from 53.6F to 58.1F at Cressy, and from 55.1F to 60.4F at Stevinson (Figure 12).

 

Merced Flow  

Figure 11. Daily average flows (cfs) recorded in the Merced River at Cressy (CRS) and Stevinson (MST) in 2010 and 2011.

Merced Temps

Figure 12. Daily average water temperatures (F) recorded in the Merced River at Cressy (CRS) and Stevinson (MST) in 2010 and 2011. 


 
2011 San Joaquin River Juvenile Migration Monitoring

On April 5 the California Department of Fish and Game initiated Kodiak trawling on the San Joaquin River near Mossdale (i.e. the Mossdale Trawl). Twenty-four days of trawling (with between 6 and 15 tows per day) were conducted between April 24 and

VAMP Chinook tagging

Figure 13. An acoustic tag is surgically implanted in a juvenile Chinook salmon.

May 22. A total of 1,454 naturally spawned juvenile Chinook salmon were captured during the reporting period, increasing the season total to 1,479. A total 146 hatchery origin Chinook salmon were also captured during the reporting period. Daily catch ranged between 2 and 212 Chinook (Figure 14).


Releases of acoustic tagged Mokelumne River Hatchery steelhead smolts were also made during the reporting period for the Six-Year Acoustic Study being conducted by the US Bureau of Reclamation and Department of Water Resources as required by the NMFS 2009 Biological Opinion on the long-term operation of the State and Federal export facilities. The objective of the study is to examine the effect of flows, exports, and other project actions on the survival of steelhead smolts outmigrating from the San Joaquin River basin. Approximately 480 steelhead smolts were released at Durham Ferry during May 3-7 and an additional 480 steelhead smolts were released during May 17-21.  

Approximately 480 acoustic tagged salmon smolts were also released at Durham Ferry during May 17-21 for the VAMP smolt survival study (Figure 13).

Trawl Chart

Figure 14. Chinook salmon catch (per 10 tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2011.


 
San Joaquin River Conditions

During the reporting period, flow in the San Joaquin River at Vernalis decreased from 22,654 cfs to 10,049 cfs (Figure 15). Water temperature in the San Joaquin River ranged from 57.1F to 64.3F at Vernalis, from 58.1F to 65.1F at Mossdale, and from 59.7F to 65.4F at Rough 'n Ready Island (Figure 16). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.8 mg/L to 8.7 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 8.1 mg/L to 9.3 mg/L at Mossdale (Figure 17).

 

San Joaquin Flow 

Figure 15. San Joaquin River flow at Vernalis from May 1, 2010, through May 22, 2011.

San Joaquin Temps   

Figure 16. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from May 1, 2010, through May 22, 2011.

San Joaquin DO 

Figure 17. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from May 1, 2010, through May 22, 2011.



Delta Exports

Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 959 cfs and 3,672 cfs (Figure 18). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) fluctuated between 0 cfs and 7,001 cfs. Combined total exports (state and federal pumps) during this period ranged from 2,141 cfs to 8,758 cfs.

State and Fed Exports

Figure 18. Daily exports at the state and federal pumping stations from May 1, 2010, through May 22, 2011.

 


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Data Disclaimer:  The data displayed on the FISHBIO website are courtesy of California Department of Fish & Game (CDFG), U.S. Fish & Wildlife Service (USFWS), Tri-dam, Turlock Irrigation District (TID), Modesto Irrigation District (MID), East Bay Municipal Utility District (EBMUD) and FISHBIO.  Data are intended to be current, but are preliminary and are not guaranteed to be accurate.  Source data compiled and provided by FISHBIO, from whom further information can be obtained.  Use or reproduction of this data is prohibited without prior permission.