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Volume 2010/11, Issue 13 May 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
San Joaquin River Juvenile Migration Monitoring
Merced River Conditions
San Joaquin Conditions
Delta Exports
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Paddle to the Sea
May 6 - June 4

North American Native Fishes Association meeting:
May 19-22

Green on the Stream Festival:
May 21

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FISHBIO

Paddle to the Sea

 

Juvenile Chinook salmon
  Photo by FISHBIO 
Key Highlights
April 4 - April 24, 2011

Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28), and a total of 59 O. mykiss were captured during the reporting period, bringing the season total to 621.

Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40), and a total of 102 Chinook salmon were captured during the reporting period, bringing the season total to 42,340.

Monitoring at Caswell State Park (RM 8) continued, and a total of 28 Chinook salmon were captured during the reporting period, bringing the season total to 471.

Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30), and a total of 29 Chinook salmon were captured during the reporting period, bringing the season total to 4,045.

Monitoring at Grayson (RM 5) continued during the reporting period, and a total of 8 Chinook salmon were captured, bringing the season total to 1,474.

Mokelumne River Juvenile Migration Monitoring at Vino Farms (RM 54) continued, and a total of 113 Chinook salmon fry and 7 O. mykiss were captured during the reporting period, bringing the season totals to 29,550 and 16, respectively.

Monitoring at Golf (RM 38) continued, and a total of 16 Chinook salmon were captured during the reporting period, increasing the season total to 3,258.

San Joaquin River Juvenile Migration Monitoring. On April 5The California Department of Fish and Game (CDFG) initiated Kodiak Trawling on the San Joaquin River near Mossdale.

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

San Joaquin River Conditions. During the reporting period,San Joaquin River flows at Vernalis decreased from 28,075 cfs to 23,067 cfs. Water temperatures in the San Joaquin River ranged from 56.7F to 61.3F at Vernalis, and from 57.4F to 62.1F at Mossdale. Average daily dissolved oxygen (DO) in the San Joaquin River ranged from 7.8 mg/L to 9.4 mg/L at Mossdale, and from 7.2 mg/L to 9.0 mg/L at Rough 'n Ready.

Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period, ranging from 4,933 cfs to 9,056 cfs.


 
2010/11 Calaveras River Juvenile Migration Monitoring


Calaveras River rotarty screw trap

Figure 1. Sunrise at the Calaveras River rotary screw trap.

The Calaveras River rotary screw trap at Shelton Road (RM 28; Figure 1) was operated thirteen days between April 4 and April 24, 2011 and a total of 59 O. mykiss were captured, increasing the season total to 621. Of the O. mykiss captured, 49 were YOY (>100 mm) and rated as fry (n=26) and parr (n=23), and five were Age 1+ (100-299 mm) and were rated as silvery parr (n=1) and smolt (n=4). Average forklengths and weights are provided for 54 of the O. mykiss in Table 1.

No Chinook salmon have been captured this season.

 

Instantaneous temperature recorded at the trap ranged from 49.4F to 61.7F, and turbidity ranged from 0.83 NTU to 3.76 NTU. Daily average combined flows from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 23 cfs and 486 cfs, and at Bellota (MRS) flows fluctuated between 0 cfs and 632 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 4 and April 24, 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 April 24, 2011.


 
2011 Stanislaus River Juvenile Migration Monitoring

The Stanislaus River rotary screw trap at Oakdale (RM 40)sampled continuously during the reporting period. A total of 102 juvenile Chinook salmon were captured, bringing the season total to 42,340. Daily catch of Chinook salmon ranged between 0 and 31 individuals. Average forklengths and weights of Chinook salmon are provided in Table 2 for the 101 Chinook that were measured. Most of the measured Chinook were smolts (n=48), but fry (n=25) and parr (n=28) 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 4 and April 24, 2011.

Catch Table  

Instantaneous temperature recorded at the trap ranged from 49.1F to 51.4F, and turbidity ranged from 0.58 NTU to 7.68 NTU (Figure 4). Daily average flows at Goodwin Dam (GDW) increased from 1,310 cfs and 3,113 cfs, and flows at Ripon (RIP) ranged from 1,254 cfs to 2,883 cfs (Figure 3).

 

No trap efficiency experiments were conducted during the reporting period.

 Flow and Catch

Figure 3. Daily Chinook salmon catch at Oakdale, and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) in 2011.

 

turbidity and catch

Figure 4. 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 28 juvenile Chinook salmon were captured, increasing the season total to 471. Daily catch ranged between zero and seven Chinook salmon (Figure 5).

 

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 52.3F and 55.4F, and turbidity ranged from 4.07 NTU to 10.40 NTU. Daily average flow at Ripon (RIP) ranged from to 1,254 cfs to 2,883 cfs.

Flow and Catch

Figure 5. Daily Chinook salmon catch at Caswell, and Stanislaus River flow recorded at Ripon (RIP) in 2011.


 
2010/11 Tuolumne River Juvenile Migration Monitoring


Juvenile Chinook salmon

Figure 6. Chinook salmon captured in the Tuolumne River rotary screw trap at Waterford.

 

The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously during the reporting period. A total of 29 juvenile Chinook salmon fry were captured bringing the season total to 4,045. Daily catch ranged between zero and five Chinook (Figure 6). Average forklengths and weights are provided in Table 3 for 26 of the Chinook salmon. The majority of the measured Chinook were smolts (n=18), but fry (n=8) 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 4 and April 24, 2011. Parentheses indicate range.

Catch Table     

 

Instantaneous temperature taken at the trap ranged from 48.9F to 52.3F, and turbidity ranged from 1.71 NTU to 4.51 NTU. Daily average flow at La Grange (LGN) decreased from 8,340 cfs to 6,120 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 April 24, 2011.

 

Juvenile Chinook salmon

Figure 8. Chinook salmon captured in the Tuolumne River rotary screws trap at Grayson.

 

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 8 Chinook salmon were captured, bringing the season total to 1,474 (Figure 8). Average forklengths and weights of all Chinook salmon are provided in Table 4. Half the Chinook captured were rated as smolts (n=4), but fry (n=3) and parr (n=1) were 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 4 and April 24, 2011. Parentheses indicate range.

Catch Table 

Instantaneous temperature taken at the trap ranged from 51.0F to 55.4F, and turbidity ranged from 1.68 NTU to 4.34 NTU. Daily average flows at Modesto (MOD) decreased from 7,950 cfs to 6,230 cfs (Figure 9).

 

No trap efficiency experiments were conducted during the reporting period.

 Flow and Catch

Figure 9. Daily Chinook salmon catch at Grayson, and Tuolumne River flow recorded at La Grange (LGN) and Modesto (MOD) between January 1 and April 24, 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 113 juvenile Chinook salmon were captured during the reporting period, bringing the season total to 29,550.

Average daily flow from Camanche Reservoir (CMN) ranged from 2,990 cfs to 3,440 cfs (Figure 10). Instantaneous temperature ranged from 48.9F to 51.3F, and instantaneous turbidity ranged between 2.41 NTU and 4.35 NTU.

Seven O. mykiss was captured during the reporting period, increasing the season total count to sixteen.

Flow and Catch

Figure 10. Daily juvenile Chinook catch at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2010, and April 24, 2011.

The Mokelumne River rotary screw trap at Golf (RM 38) continued intermittent monitoring during the reporting period and a total of 16 juvenile Chinook salmon were captured, increasing the season total to 3,258.

Average daily flow at Woodbridge Dam (WBR) decreased from 3,081 cfs to 2,600 cfs (Figure 11). Instantaneous temperature ranged between 49.5F and 52.0F, and instantaneous turbidity ranged between 3.99 NTU and 6.82 NTU.

No O. mykiss were captured during the reporting period. Season total remains at 12.

Flow and Catch

Figure 11. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between January 1 and April 24, 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). Fifteen days (ten tows per day) of trawling were conductedbetween April 5 and April 24. A total of 25 juvenile Chinook salmon were captured. Catch ranged between 0 and 10 Chinook per 10 tows (Figure 12).  

Flow and Catch

Figure 12. Chinook salmon catch (per 10 tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2011.


 
Merced River Conditions

Flows in the Merced River at Cressy (CRS; RM 52) fluctuated between 2,980 cfs and 5,620 cfs during reporting period. Flows at Stevinson (MST; RM 5) fluctuated between 2,767 cfs and 5,561 cfs (Figure 13). Water temperatures in the Merced River ranged from 50.9F to 54.9F at Cressy, and from 51.7F to 56.6F at Stevinson (Figure 14). 

Flow  

Figure 13. Daily average flows (cfs) recorded in the Merced River at Cressy (CRS) and Stevinson (MST) in 2010 and 2011.

Temperature

Figure 14. Daily average water temperatures (F) recorded in the Merced River at Cressy (CRS) and Stevinson (MST) in 2010 and 2011. 


 
San Joaquin Conditions



During the reporting period, flow in the San Joaquin River at Vernalis decreased from 28,075 cfs to 23,067 (Figure 15). Water temperature in the San Joaquin River ranged from 56.7F to 61.3F at Vernalis, from 57.4F to 62.1F at Mossdale, and from 58.5F to 63.1F at Rough 'n Ready Island (Figure 16). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.2 mg/L to 9.0 mg/L in the deep water ship channel (measured at Rough 'n Ready Island), and from 7.8 mg/L to 9.4 mg/L at Mossdale (Figure 17).

Flow 

Figure 15. San Joaquin River flows at Vernalis from April 1, 2010, through April 24, 2011.

Temperature   

Figure 16. San Joaquin River daily average water temperatures at Vernalis, Mossdale, and Rough 'n Ready from April 1, 2010, through April 24, 2011.

Dissolved Oxygen 

Figure 17. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from April 1, 2010, through April 24, 2011.



Delta Exports

 

Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 890 cfs and 2,820 cfs (Figure 18). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) fluctuated between 2,230 cfs and 6,312 cfs. Combined total exports (state and federal pumps) during this period ranged from 4,933 cfs to 9,056 cfs.


Exports

Figure 18. Daily exports at the state and federal pumping stations from April 1, 2010, through April 24, 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) 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.