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Volume 2010, Issue 16
July 6, 2010
In This Issue
Calaveras River Juvenile Migration Monitoring
Mokelumne River Juvenile Migration Monitoring
San Joaquin River Juvenile Migration Monitoring
Stanislaus River Juvenile Migration Monitoring
Tuolumne River Juvenile Migration Monitoring
Stanislaus River Weir Monitoring
San Joaquin Conditions
Delta Exports
events
Water Education Foundation Delta Tour:
July 14-18

Ecological Society of America:
Aug. 1-6

American Fisheries Society Meeting:
Sept. 12-16

Delta Science Conference:

Sept. 27-29

links

FISHBIO

 
 
Pacific Northwest Aquatic Monitoring Partnership

signup
field notes
Largemouth Bass
  Photo by FISHBIO.
 
Key Highlights
 
Calaveras River Juvenile Migration Monitoring. A total of 73 O. mykiss were captured at Shelton Road (RM 28), increasing the season total to 2,797.

Mokelumne River Juvenile Migration Monitoring. A total of 11 Chinook salmon were captured at Vino Farms (RM 54), increasing the season total to 8,397. Fifty-two Chinook salmon were captured at Golf (RM 38), increasing the season total to 432, and 148 Chinook salmon were captured at Woodbridge (RM 38), increasing the season total to 375.

San Joaquin River Juvenile Migration Monitoring. A total of five juvenile Chinook salmon were captured at Mossdale during the reporting period, increasing the season total to 302.

Stanislaus River Juvenile Migration Monitoring.
The 2010 Oakdale rotary screw trap (RM 40) sampling season ended on June 25. A total of 11 Chinook salmon were captured, increasing the season total to 36,823.
The 2010 Caswell State Park rotary screw trap (RM 8) sampling season ended on June 17. No Chinook salmon were captured during the reporting period. The season total remains at 1,104.

Tuolumne River Juvenile Migration Monitoring. The Tuolumne River rotary screw trap sampling at Waterford (RM 30) ended on June 11.A total of eighteen Chinook salmon were captured, increasing the season total to 2,347. The Tuolumne River rotary screw trap sampling at Grayson (RM 5) ended on June 17. Four Chinook salmon were captured, increasing the season total to 52.

Weir Monitoring. The Stanislaus River Weir sampling season ended on June 23. One Chinook salmon was detected passing upstream of the weir.

San Joaquin River Conditions. San Joaquin River flows at Vernalis ranged from 2,563 cfs to 6,109 cfs. Water temperatures in the San Joaquin River ranged between 62.5F and 68.7F and average daily dissolved oxygen (DO) ranged between 8.8 mg/L and 10.7 mg/L.

Delta Exports. Combined total exports (state and federal pumps) decreased during the reporting period ranging from 7,531 cfs to 4,798 cfs.


 
We encourage subscribers to contribute any relevant information for future issues of the newsletter (e.g., additional monitoring studies, announcements of upcoming meetings and events, etc). If you would like to contribute, please contact Chrissy Sonke.
 


2009/10 Calaveras River Juvenile Migration Monitoring
 
The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled twelve days between June 7 and June 27. A total of 73 O. mykiss were captured, increasing the season total to 2,797. Daily catch ranged between 1 and 12 O. mykiss (Figure 1). Most of the O. mykiss captured, (n=69) were YOY (<100 mm) and were rated as fry (n=1), parr (n=55), silvery parr (n=7), and smolt (n=1). Four Age 1+ (100-299 mm) fish were captured and rated as parr (n=1) and silvery parr (n=2). Average forklengths and weights are provided in Table 1 for the 72 O. mykiss measured.

No Chinook salmon have been captured this season.
 
Instantaneous temperatures recorded at the trap ranged from 59F to 64F (Figure 2), and turbidity ranged from 0.05 NTU to 1.77 NTU. Daily average flow fluctuated between 121 cfs and 210 cfs at New Hogan Dam (NHG), between 28 cfs and 40 cfs at Bellota (MRS), and no flow was recorded at Cosgrove Creek (COS).
 
 
Table 1. Biosampling data for O. mykiss captured and measured at Shelton Road between June 7 and June 27, 2010. Parentheses indicate range.

Catch Table

Flow and Catch

Figure 1. Daily O. mykiss catch at Shelton Road and Calaveras River flow recorded by New Hogan Dam (NHG) and Cosgrove Creek (COS) combined, between November 1, 2009 and June 27, 2010.

 
 Temp and Catch

Figure 2. Daily O. mykiss catch at Shelton Road and Calaveras River temperature recorded instantaneously at trap location between November 1, 2009 and June 27, 2010.

 
2009/10 Mokelumne River Juvenile Migration Monitoring
 
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued to sample intermittently between June 7 and June 27, and a total of eleven Chinook salmon were captured, increasing the season total to 8,397.

Average daily flows from Camanche Reservoir (CMN) decreased from 1,332 cfs to 799 cfs (Figure 3). Instantaneous temperature ranged between 56.1F and 58.3F and instantaneous turbidity ranged between 1.42 NTU and 2.68 NTU.
 
Two O. mykiss were captured at Vino Farms during the report period increasing the season total to 52.

Flow and Catch

Figure 3. Daily Chinook catches at Vino Farms and Mokelumne River flow recorded by Camanche Reservoir (CMN), between December 1, 2009 and June 27, 2010.
 
The Mokelumne River rotary screw trap at Golf (RM 38) continued to sample intermittently between June 7 and June 27. A total of 52 Chinook salmon were captured, increasing the season total to 432 (Figure 4).
 
Average daily flow recorded at Woodbridge (WBR) decreased from 1,086 cfs to 530 cfs. Instantaneous temperature ranged between 59.4F and 62.6F and instantaneous turbidity ranged between 1.67 NTU and 3.08 NTU.
 
Seven O. mykiss were captured at Golf during this reporting period, increasing the season total to 714 (Note: One of the O. mykiss had clipped adipose fin indicating hatchery origin).

 
 Flow and Catch
Figure 4. Daily Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge (WBR), between December 1, 2009 and June 27, 2010.
 
The Mokelumne River rotary screw trap at Woodbridge (RM 38) continued sampling during the reporting period. A total of 148 Chinook salmon were captured during the reporting period, increasing the season total to 375 (Figure 5).
 
Average daily flows recorded at Woodbridge (WBR) decreased from 1,086 cfs to 530 cfs. Instantaneous temperature ranged between 59.4F and 63.1F and instantaneous turbidity ranged between 2.03 NTU and 3.39 NTU.
 
Twenty-six O. mykiss were captured at Woodbridge during this reporting period, increasing the season total to 140.

Flow and Catch 

Figure 5. Daily Chinook catches at Woodbridge and Mokelumne River flow recorded at Woodbridge (WBR), between April 14 and June 27, 2010.



2010 San Joaquin River Juvenile Migration Monitoring

California Department of Fish and Game conducted nine days (ten tows per day) of Kodiak trawling (Mossdale Trawl) on the San Joaquin River near Mossdale between June 7 and June 27. A total of five juvenile Chinook salmon were captured, and catch ranged between zero and three Chinook per ten tows (Figure 6).
 
Flow and Catch 

Figure 6. Chinook salmon catch (per ten tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2010.


2010 Stanislaus River Juvenile Migration Monitoring

Figure 7. Removing Stanislaus River rotary screw trap at Oakdale.
Removal of trap
The Stanislaus River rotary screw trap at Oakdale (RM 40) discontinued sampling on June 25 (Figure 7). Twelve days were sampled during the reporting period between June 7 and June 25. A total of eleven juvenile Chinook salmon were captured, increasing the season total to 36,823. Daily catch ranged between zero and three Chinook salmon. Average forklengths and weights of Chinook salmon are provided in Table 2 for all eleven fish that were measured. Most of the measured Chinook were smolts (n=10), but a single parr was caught and measured.

No O. mykisswere captured at Oakdale during the reporting period. The season total remains at 14 O. mykiss.


Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between June 7 and June 25, 2010.

Catch Table
   
Instantaneous temperature recorded at the trap ranged from 60.9F to 64.9F, and turbidity ranged from 0.07 NTU to 1.52 NTU. Daily average flow during the reporting period ranged from 253 cfs to 439 cfs at Goodwin Dam (GDW) and 291 cfs to 345 cfs at Ripon (RIP) (Figure 8).

No trap efficiency experiment were conducted during this reporting period.

 
Flow and Catch 

Figure 8. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP), 2010.

The Stanislaus River rotary screw trap at Caswell State Park (RM 8) discontinued sampling on June 17. No Chinook salmon were captured during the reporting period. The season total remains at 1,104.

No O. mykiss  were captured during the sampling period and the season total remains at one.

No trap efficiency experiments were conducted due to insufficient daily catch.

Instantaneous temperature recorded at the trap ranged from 67.1F and 73.8F, and turbidity ranged from 0.42 NTU to 4.57 NTU. Daily average flow at Ripon (RIP) ranged from 291 cfs to 345 cfs.


2010 Tuolumne River Juvenile Migration Monitoring

The 2010 Tuolumne River rotary screw trap sampling at Waterford (RM 30) ended June 11. A total of eighteen juvenile Chinook salmon were captured during the reporting period, increasing the season total to 2,347. Daily catch ranged between zero and seven Chinook salmon. Average forklengths and weights of the salmon are provided in Table 3 for all eighteen fish that were measured, all of which were rated as smolt.

No O. mykiss were captured this season.

Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between June 7 and June 11, 2010. Parentheses indicate range.
 Catch Table

Instantaneous temperature taken at the trap ranged from 52.7F to 56.3F, and turbidity ranged from 0.22 NTU to 1.38 NTU. Daily average flow records from La Grange (LGN) ranged from 1,350 cfs to 5,520 cfs (Figure 9).

Due to insufficient daily catch, no trap efficiency experiments were conducted during the reporting period.
 
Flow and Catch

Figure 9. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2010.
 
Figure 10. Removing Tuolumne River rotary screw trap at Grayson.
Removal of trap
The 2010 Tuolumne River rotary screw trap sampling at Grayson (RM 5) ended June 17 (Figure 10). Four Chinook salmon were captured during the reporting period, increasing the season total to 52 (Table 4).

No O. mykiss were captured this season.

Trap efficiency releases were not conducted this season due to insufficient daily catch.

Instantaneous temperature taken at the trap ranged from 54.6F to 62.4F, and turbidity ranged from 0.92 NTU to 5.56 NTU. Daily average flow at Modesto (MOD) ranged from 1,380 cfs to 5,620 cfs (Figure 11).
 
Table 4. Biosampling data for Chinook salmon captured and measured at Grayson June 7 and June 11, 2010. Parentheses indicate range.

Catch Table 

Flow and Catch
Figure 11. Daily Chinook salmon catch at Grayson and Tuolumne River flow at La Grange (LGN) and Modesto (MOD), 2010.


 
2009/10 Stanislaus River Weir Monitoring 
 
Figure 12. Stanislaus River Weir removal.
Removal of weir
The Stanislaus River Weir sampling season ended on June 23. One Chinook salmon was detected passing upstream, increasing the season total to 1,289 (Table 5; Figure 12).
 
No O. mykiss were detected passing upstream during this reporting period. The season total remains at ten O. mykiss.
 

 


Table 5. Net passage counts for all species between June 7 and June 23, 2010 at the Stanislaus River Weir.

Net Counts

 
San Joaquin Conditions
 
Between June 7 and June 27 flows in the San Joaquin River at Vernalis ranged from 2,563 cfs to 6,109 cfs (Figure 13). Water temperatures in the San Joaquin River fluctuated between 62.5F and 68.7F at Vernalis; between 64.3F and 73.0F at Mossdale; and between 68.3F and 74.6F at Rough 'n Ready Island (Figure 14). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated between 6.5 mg/L and 8.0 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and fluctuated between 8.8 mg/L and 10.7 mg/L at Mossdale (Figure 15).


Flow 

Figure 13. San Joaquin River flow at Vernalis, June 1, 2009 through June 27, 2010.



Temperature 
Figure 14. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, June 1, 2009 through June 27, 2010.

 
D.O.
 
Figure 15. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, June 1, 2009 through June 27, 2010.


Water temperature in the San Joaquin River generally increases between January and June. Comparatively, water temperature during this time period has been relatively similar from 2007 to 2010; however, it appears that some fluctuation occurs during the months of May and June (Figure 16).


Temperature
Temperature
Temperature

Figure 16. San Joaquin River daily average water temperature at Rough n' Ready Island, Mossdale, and Vernalis, January through June, (2007-2010).


 
Delta Exports 
 
Combined total exports (state and federal pumps) decreased during the reporting period ranging from 7,531 cfs to 4,798 cfs. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 2,610 cfs to 3,530 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) decreased from 4,006 cfs to 2,136 cfs during the reporting period (Figure 17).


Exports 

Figure 17. Daily exports at the Federal and State pumping stations, June 1, 2009 through June 27, 2010.

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