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Volume 2010/11, Issue 16July 26, 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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 September 20-21

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Key Highlights
June 20 - July 18, 2011

Calaveras River Juvenile Migration Monitoring ended at Shelton Road (RM 28) on July 15. A total of 8 O. mykiss were captured during the reporting period, bringing the season total to 734.

Stanislaus River Juvenile Migration Monitoring ended at Oakdale (RM 40) on June 30. A total of 5 Chinook salmon were captured during the reporting period, bringing the season total to 42,472.

There is no new data to report for the rotary screw trap monitoring at Caswell State Park (RM 8).

Tuolumne River Juvenile Migration Monitoring ended at Waterford (RM 30) on June 30. A total of 17 Chinook salmon were captured during the reporting period, bringing the season total to 4,394.

Monitoring at Grayson (RM 5) ended on June 30. A total of six Chinook salmon were captured, bringing the season total to 1,645.

Mokelumne River Juvenile Migration Monitoring at Vino Farms (RM 54) season ended on June 27. A total of 5 Chinook salmon and 3 O. mykiss were captured during the reporting period, bringing the season totals to 29,806 and 111, respectively.

Monitoring at Golf (RM 38) continued, and a total of 115 Chinook salmon and 92 O. mykiss were captured during the reporting period, increasing the season total to 3,923 and 188, respectively.

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

San Joaquin River Juvenile Migration Monitoring conducted by CDFG at Mossdale ended July 1. A total of 154 naturally spawned juvenile Chinook salmon were captured during the reporting period, increasing the season total to 3,257.

San Joaquin River Conditions. San Joaquin River flow at Vernalis fluctuated from 8,806 cfs to 12,583 cfs. Water temperature in the San Joaquin River ranged from 64.0F to 71.9F at Vernalis, and from 65.6F to 78.3F at Mossdale. Average daily dissolved oxygen (DO) in the San Joaquin River ranged from 7.3 mg/L to 9.1 mg/L at Mossdale, and from 7.5 mg/L to 9.3 mg/L at Rough 'n Ready.

Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period, ranging from 9,440 cfs to 11,280 cfs.


 
2010/11 Calaveras River Juvenile Migration Monitoring

Monitoring at Shelton Road (RM 28) ended for the season on July 15. The trap was

O. mykiss

Figure 1. O. mykiss captured at the Calaveras River rotary screw trap at Shelton Road.

operated fifteen days during the reporting period, and a total of 8 O. mykiss were captured, increasing the season total to 734 (Figure 1). Of the O. mykiss measured, four were YOY (>100 mm) and were rated as silvery parr (n=4), and four were Age 1+ (100-299 mm), and rated as silvery parr (n=4). Average forklengths and weights are provided for the O. mykiss in Table 1.

No Chinook salmon were captured during the 2010/11 monitoring season.

 

Instantaneous temperature recorded at the trap ranged from 53.4F to 55.4F, and turbidity ranged from 0.70 NTU to 2.47 NTU. Daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 252 cfs and 309 cfs, and at Bellota (MRS) flow fluctuated between 144 cfs and 212 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 June 20 and July 15, 2011. Parentheses indicate range.

Catch Table

 Flow and Catch   

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 July 18, 2011.


 
2011 Stanislaus River Juvenile Migration Monitoring


Removing rotary screw trap

Figure 3. Removing the Stanislaus River rotary screw trap at Oakdale.

Rotary screw trap at Oakdale (RM 40) ended for the season on June 30 (Figure 3). A total of 5 juvenile Chinook salmon were captured during the reporting period, bringing the season total to 42,472. Daily catch of Chinook salmon ranged between zero and one individuals. Average forklengths and weights of Chinook salmon are provided in Table 2. All measured Chinook were smolts (n=5).

 

No O. mykiss were captured during the reporting period, and a total of 21 were captured during the 2011 monitoring season.

 

 

 

Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between June 20 and June 30, 2011. 

Catch Table  

Daily average flow at Goodwin Dam (GDW) increased from 1,501 cfs and 2,548 cfs, and flow at Ripon (RIP) ranged from 1,526 cfs to 2,460 cfs (Figure 4). Instantaneous temperature recorded at the trap ranged from 52.7F to 55.5F, and turbidity ranged from 0.41 NTU to 1.52 NTU (Figure 5).

 

No trap efficiency experiments were conducted during the reporting period.

 

 Flow and Catch

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

 

turbidity and catch

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

 

There is no new data to report for the Stanislaus River rotary screw trap at Caswell State Park (RM 8).

 


 
2010/11 Tuolumne River Juvenile Migration Monitoring

 

  

RST at Waterford

Figure 6. Tuolumne River rotary screw trap at Waterford raised for the season.

Rotary screw trap monitoring at Waterford (RM 30) ended for the season on June 30 (Figure 6). A total of 17 juvenile Chinook salmon were captured, bringing the season total to 4,394. Daily catch ranged between zero and five Chinook. Average forklengths and weights are provided in Table 3. All measured Chinook salmon were smolts (n=16).

 

No O. mykiss were captured during the 2010/11 monitoring season.

 

  

  

  

Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between June 20 and June 30, 2011. Parentheses indicate range.

Catch Table  

Instantaneous temperature taken at the trap ranged from 53.0F to 57.8F, and turbidity ranged from 0.51 NTU to 2.30 NTU. Daily average flow at La Grange (LGN) fluctuated from 1,160 cfs to 5,450 cfs (Figure 7).

 

No trap efficiency experiments were conducted during the reporting period.

 

 Flow and Catch

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 June 30, 2011.

 

Rotary screw trap monitoring at Grayson (RM 5) ended for the season on June 30. A total of 6 Chinook salmon were captured, bringing the season total to 1,645. All measured Chinook salmon were smolts (n=6), and average forklengths and weights are provided in Table 4.

 

No O. mykiss were captured during the 2011 monitoring season.

 

Table 4. Biosampling data for Chinook salmon captured and measured at Grayson between June 20 and June 30, 2011. Parentheses indicate range.


Catch Table 

Instantaneous temperature taken at the trap ranged from 56.6F to 60.0F, and turbidity ranged from 1.09 NTU to 4.05 NTU. Daily average flow at Modesto (MOD) fluctuated from 1,380 cfs to 4,890 cfs (Figure 8).

 

No trap efficiency experiments were conducted during the reporting period.


 

 Flow and Catch

Figure 8. Daily Chinook salmon catch at Grayson, and Tuolumne River flow recorded at La Grange (LGN) and Modesto (MOD) between January 1 and June 30, 2011.



2010/11 Mokelumne River Juvenile Migration Monitoring

Rotary screw trap monitoring at Vino Farms (RM 54) ended for the season on June 27. A total of 5 juvenile Chinook salmon were captured during the reporting period, bringing the season total to 29,806.

Average daily flow from Camanche Reservoir (CMN) fluctuated during the reporting period ranging from 1,290 cfs to 4,962 cfs (Figure 9). Instantaneous temperature ranged from 57.2F to 57.4F, and instantaneous turbidity ranged between 2.09 NTU and 3.15 NTU.

 

A total of three O. mykiss were captured during the reporting period, increasing the season total to 111.

 

Flow and Catch

Figure 9. Daily juvenile Chinook catch at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2010, and July 18, 2011.

The Mokelumne River rotary screw trap at Golf (RM 38) continued intermittent monitoring during the reporting period and a total of 115 juvenile Chinook salmon were captured, increasing the season total to 3,923.

Average daily flow at Woodbridge Dam (WBR) fluctuated during the reporting period ranging from 1,041 cfs to 3,935 cfs (Figure 10). Instantaneous temperature ranged between 57.9F and 63.0F, and instantaneous turbidity ranged between 3.13 NTU and 7.86 NTU.

  

A total of 92 O. mykiss were captured during the reporting period increasing the season total to 188.

 

Flow and Catch

Figure 10. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between January 1 and July 18, 2011.


 
Merced River Conditions

Flow in the Merced River at Cressy (CRS; RM 52) fluctuated between 143 cfs and 3,870 cfs during reporting period. Flow at Stevinson (MST; RM 5) fluctuated between 787 cfs and 2,599 cfs (Figure 11). Water temperature in the Merced River ranged from 59.7F to 65.7F at Cressy, and from 62.2F to 69.3F at Stevinson (Figure 12).

Flow  

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

Temperature

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

During the reporting period the California Department of Fish and Game conducted the last Kodiak trawls for the season in the San Joaquin River near Mossdale (i.e. the Mossdale Trawl). Six days of trawling (10 tows per day) were conductedbetween June 20 and July 1. A total of 154 naturally spawned juvenile Chinook salmon were captured during the reporting period, increasing the season total to 3,257. Daily catch ranged between 4 and 76 Chinook (Figure 13).

Trawling Catch

Figure 13. 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 fluctuated from 8,806 cfs to 12,583 cfs (Figure 14). Water temperature in the San Joaquin River ranged from 64.0F to 71.9F at Vernalis, from 65.6F to 78.3F at Mossdale, and from 69.1F to 75.9F at Rough 'n Ready Island (Figure 15). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.5 mg/L to 9.3 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 7.3 mg/L to 9.1 mg/L at Mossdale (Figure 16).

 

Flow 

Figure 14. San Joaquin River flow at Vernalis from July 1, 2010, through July 18, 2011.

  

Temperature   

Figure 15. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from July 1, 2010, through July 18, 2011.


  

Dissolved Oxygen 

 

Figure 16. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from July 1, 2010, through July 18, 2011.


Delta Exports

Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) increased from 2,963 cfs to 4,235 cfs (Figure 17). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 6,279 cfs to 7,096 cfs. Combined total exports (state and federal pumps) during this period ranged from 9,440 cfs to 11,280 cfs.

 

Exports

Figure 17. Daily exports at the state and federal pumping stations from July 1, 2010, through July 18, 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.