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Volume 2009/10, Issue 10
March 12, 2010
In This Issue
Calaveras River Juvenile Migration Monitoring
Mokelumne River Juvenile Migration Monitoring
Stanislaus River Juvenile Migration Monitoring
Tuolumne River Juvenile Migration Monitoring
Stanislaus River Weir Monitoring
Tuolumne River Weir Monitoring
San Joaquin Conditions
Delta Exports
events
AFS/SRF Annual Meeting:
March 10-14

VAMP Biology/Hydrology Technical Team Meeting:
March 17

Delta Science Program VAMP Review:
March 2-3

TRTAC Meeting:
March 18

links

FISHBIO

 
 
Wild Salmon

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field notes
Chinook salmon
  Photo by FISHBIO.
 
Key Highlights
 
Calaveras River Juvenile Migration Monitoring. A total of 25 O. mykiss were captured at Shelton Road (RM 28) increasing the season total to 449.

Mokelumne River Juvenile Migration Monitoring. A total of 502 Chinook salmon were captured at Vino Farms (RM 54) increasing the season total to 7,268 and 3 Chinook salmon were captured at Golf (RM 38) increasing the season total to 20.

Stanislaus River Juvenile Migration Monitoring. On February 15 seining surveys were conducted at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River and Chinook salmon were captured at Riverbank (RM 33), McHenry (RM 28), and Caswell (RM 9).

A total of 3,866 Chinook salmon were captured in the Oakdale rotary screw trap (RM 40) increasing the season total to 30,835.

At Caswell State Park (RM 8), a total of 37 Chinook salmon were captured increasing the season total to 345.

Tuolumne River Juvenile Migration Monitoring. A total of 262 Chinook salmon were captured at Waterford (RM 30) increasing the season total to 988. No Chinook salmon were captured at Grayson (RM 5). Season total remains at 15.

Weir Monitoring. A total of 5 Chinook salmon were detected as they passed upstream of the Stanislaus River Weir and 3 Chinook salmon were detected as they passed upstream of the Tuolumne River Weir.

San Joaquin River Conditions. San Joaquin River flows at Vernalis generally increased ranging between 2,340 cfs and 3,729 cfs. Water temperatures in the San Joaquin River ranged between 53.3F and 57.0F and average daily dissolved oxygen (DO) ranged between 9.3 mg/L and 10.7 mg/L.

Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period ranging between 5,910 cfs and 7,627 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

Shelton RST The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled eight days between February 15 and February 28 (Figure 1). A total of 25 O. mykiss were captured, increasing the season total to 449. Daily catch ranged between zero and eight O. mykiss (Figure 2). Most of the O. mykiss captured, (n=18) were Age 1+ (100-299 mm) and were rated as parr (n=1), silvery parr (n=15), and smolt (n=1). Seven YOY (<100 mm) were also captured and were all rated as fry. Average forklengths and weights of O. mykiss are provided in Table.

 
No Chinook salmon have been captured this season.
 
Instantaneous temperatures recorded at the trap ranged from 49.0F to 54.0F (Figure 3), and turbidity ranged from 0.13 NTU to 25.10 NTU. Daily average flow fluctuated between 23 cfs and 49 cfs at New Hogan Dam (NHG), between 3 cfs and 93 cfs at Cosgrove Creek (COS), and between 0 cfs and 430 cfs at Bellota (MRS).
 
 
Table 1. Biosampling data for O. mykiss captured and measured at Shelton Road between February 15 and February 28, 2010. Parentheses indicate range.
 
shelton biosample
 

 
Flow and Catch


Figure 2. 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 February 28, 2010.

 

 
 Temp and Catch

Figure 3. Daily O. mykiss catch at Shelton Road and Calaveras River temperature recorded instantaneously at trap location between November 1, 2009 and February 28, 2010.


 
2009/10 Mokelumne River Juvenile Migration Monitoring
 
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued to sample intermittently between February 14 and February 28 and a total of 502 Chinook salmon were captured increasing the season total to 7,268.

Average daily flows from Camanche Reservoir (CMN) were stable between 329 cfs and 333 cfs (Figure 4). Instantaneous temperature ranged between 48.9F and 51.1F and instantaneous turbidity ranged between 1.75 NTU and 3.89 NTU.
 
Eleven O. mykiss were captured at Vino Farms during the report period increasing the season total to twelve.

 

Flow and Catch

Figure 4. Daily Chinook catches at Vino Farms and Mokelumne River flow recorded by Camanche Reservior (CMN), between December 1, 2009 and February 28, 2010.
 
The Mokelumne River rotary screw trap at Golf (RM 38) continued to sample intermittently between February 14 and February 28 and a total of 3 Chinook salmon was captured increasing the season total to 20 (Figure 5).
 
Average daily flows recorded at Woodbridge (WBR) ranged between 224 cfs and 315 cfs (Figure 4). Instantaneous temperature ranged between 49.3F and 53.1F and instantaneous turbidity ranged between 3.18 NTU and 13.00 NTU.
 
156 O. mykiss were captured at Golf during this reporting period increasing the season total to 159 (Note: 154 O. mykiss were Ad-clip).



Flow and Catch

Figure 5. Daily Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge (WBR), between December 1, 2009 and February 28, 2010.



2010 Stanislaus River Juvenile Migration Monitoring

Stanislaus River seining surveys were conducted on February 15 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. A total of 3 Chinook were captured at Riverbank (RM 33), 12 Chinook salmon were captured at McHenry (RM 28), and 5 Chinook were captured at Caswell (RM 9).  Forklengths ranged from 31 to 41 mm (avg: 34.8 mm).  Average daily flow at Ripon was 904 cfs.

The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between February 15 and February 28. A total of 3,866 juvenile Chinook salmon were captured during the reporting period increasing the season total to 30,835. Daily catch ranged between 40 and 894 Chinook salmon. Average forklengths and weights of Chinook salmon are provided in Table 2 for 813 fish that were measured. Most of the measured Chinook were fry (n=790) but there were also some parr (n=4) and smolts (n=19), including 14 larger fish (i.e., > 100 mm).

No O. mykiss were captured at Oakdale during the reporting period. Season total remains at seven.
 
Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between February 15 and February 28, 2010.
 
oakdale biosample 
 
Instantaneous temperature recorded at the trap ranged from 49.4F to 51.2F, and turbidity ranged from 0.13 NTU to 5.69 NTU. Daily average flow fluctuated during the reporting period between 938 cfs to 1,009 cfs at Goodwin Dam (GDW) and 901 cfs to 1,216 cfs at Ripon (RIP) (Figure 6).

No trap efficiency experiments were conducted during the reporting period.



Flow and Catch

Figure 6. 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) sampled intermittently between February 15 and February 28.  A total of 37 juvenile Chinook salmon were captured during the reporting period increasing the season total to 345. Daily catch ranged between zero and eleven Chinook salmon.

No O. mykiss have been captured so far this season.

No trap efficiency experiments were conducted during the reporting period.

Instantaneous temperature recorded at the trap ranged from 50.5F and 52.5F, and turbidity ranged from 2.32 NTU to 10.39 NTU. Daily average flow at Ripon (RIP) fluctuated between 901 cfs and 1,216 cfs.




2010 Tuolumne River Juvenile Migration Monitoring

The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously between February 15 and February 28. A total of 262 juvenile Chinook salmon were captured during the reporting period increasing the season total to 988. Daily catch ranged between four and 43 Chinook salmon (Figure 7). Average forklengths and weights of Chinook salmon are provided in Table 3 for 261 fish that were measured. Most of the measured fish were fry (n=258) but there were also parr (n=1) and smolts (n=2).

No O. mykiss have been captured so far this season.

Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between February 15 and February 28, 2010. Parentheses indicate range.
 
waterford biosample

marked fish
 Instantaneous temperature taken at the trap ranged from 51.0F to 56.1F, and turbidity ranged from 0.20 NTU to 9.17 NTU. Daily average flow records from La Grange (LGN) are not complete for the reporting period but flows were estimated to be stable around 225 cfs.

Three trap efficiency experiments were conducted using naturally spawned juvenile Chinook salmon marked caudal fin orange (CFO, Figure 8). Preliminary capture efficiency estimates from these releases were 7.1%,
3.0%, and 6.9% at estimated flows of 225 cfs (Table 4).
 
Table 4. Trap efficiency tests conducted at Waterford between February 15 and February 28, 2010.
 
 Waterford TE

Flow and Catch

Figure 7. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2010. Note: Daily average flow at Modesto has not been available since February 10, flows at La Grange have been estimated since January 20. 
 
grayson rst
 
The Tuolumne River rotary screw trap at Grayson (RM 5) continued sampling during the reporting period (Figure 9). No Chinook salmon were captured during the reporting period. Season total remains at 15 (Figure 10).

No O. mykiss have been captured yet this season.

Trap efficiency releases have not yet been conducted this season due to insufficient daily catch.

 
Instantaneous temperature taken at the trap ranged from 52.3F to 58.1F, and turbidity ranged from 0.51 NTU to 33.80 NTU. Daily average flow at Modesto (MOD) has not been available since February 10.
Flow and Catch

Figure 10. Daily Chinook salmon catch at Grayson and Tuolumne River flow at La Grange (LGN) and Modesto (MOD), 2010. Note: Daily average flow at Modesto has not been available since February 10, flows at La Grange have been estimated since January 20.


 
2009/10 Stanislaus River Weir Monitoring 
 
Between February 15 and February 28 a total of five Chinook salmon were detected as they passed upstream of the Stanislaus River Weir increasing the season total to 1,275. Daily passage ranged between zero and two Chinook salmon. Trapping was conducted February 24 through February 26 due to high turbidity (eg. >3 NTU) which precluded identification to species using the vaki system.
 
No O. mykiss were detected passing upstream during this reporting period. The season total remains at eight O. mykiss.
 
Table 5. Annual Chinook passage at the Stanislaus River Weir 2003-2009. Asterisk denotes an extended no sample period from January 10 to March 23, 2009.
 Passage

 
2009/10 Tuolumne River Weir Monitoring
 
Between February 15 and February 28 a total of 3 Chinook salmon were detected as they passed upstream of the Tuolumne River Weir increasing the season total to 298. Daily passage ranged between zero and one Chinook. 
 
No O. mykiss were detected during this reporting period. Season total remains at one.



 
San Joaquin Conditions
 
Between February 15 and February 28, flows in the San Joaquin River at Vernalis generally increased from 2,340 cfs to 3,729 cfs (Figure 11). Water temperatures in the San Joaquin River fluctuated between 53.3F and 57.0F at Vernalis; between 53.5F and 57.9F at Mossdale; and between 55.2F and 56.9F at Rough 'n Ready Island (Figure 12). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated between 7.5 mg/L and 9.2 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and fluctuated between 9.3 mg/L and 10.7 mg/L at Mossdale (Figure 13).


Flow 

Figure 11. San Joaquin River flow at Vernalis, February 1, 2009 through February 28, 2010.

Temperature 

 

Figure 12. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, February 1, 2009 through February 28, 2010.

 

D.O.
 
 
Figure 13. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, February 1, 2009 through February 28, 2010.

 
Delta Exports 
 
Combined total exports (state and federal pumps) fluctuated between 5,910 cfs and 7,627 cfs during the reporting period. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 2,208 cfs and 3,429 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 3,460 cfs to 4,212 cfs during the reporting period (Figure 14).



 Exports


Figure 14. Daily exports at the Federal and State pumping stations, February 1, 2009 through February 28, 2010.

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