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Volume 2010, Issue 12
April 21, 2010
In This Issue
Calaveras River Juvenile Migration Monitoring
Mokelumne River Juvenile Migration Monitoring
ARTICLE HEADLINE
Stanislaus River Juvenile Migration Monitoring
Tuolumne River Juvenile Migration Monitoring
Stanislaus River Weir Monitoring
Tuolumne River Weir Monitoring
San Joaquin Conditions
Delta Exports
events
Delta Stewardship Council Meeting:
April 22-23

2010 VAMP Period:

April 23 - May 23

ASLO & NABS Meeting:

June 6-11
 
TRTAC Meeting:
June 10

links

FISHBIO

 
 
Hydroacoustic Technology Inc.

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field notes
Fishbio Boat
  Photo by FISHBIO.
 
Key Highlights
 
Calaveras River Juvenile Migration Monitoring. A total of 278 O. mykiss were captured at Shelton Road (RM 28) increasing the season total to 824.

Mokelumne River Juvenile Migration Monitoring. A total of 62 Chinook salmon were captured at Vino Farms (RM 54) increasing the season total to 8,167, and 7 Chinook salmon were captured at Golf (RM 38) increasing the season total to 63.

San Joaquin River Juvenile Migration Monitoring.  On March 29, the California Department of Fish and Game (CDFG) initiated Kodiak Trawling on the San Joaquin River near Mossdale.

Stanislaus River Juvenile Migration Monitoring. On March 31, seining surveys were conducted at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. Chinook salmon were captured at Oakdale (RM 40), Jacob Meyers (RM 33) and McHenry (RM 28). 

A total of 630 Chinook salmon were captured in the Oakdale rotary screw trap (RM 40) increasing the season total to 34,574.

At Caswell State Park (RM 8), data is not yet available for the reporting period.

Tuolumne River Juvenile Migration Monitoring. A total of 89 Chinook salmon were captured at Waterford (RM 30) increasing the season total to 1,440. Two Chinook salmon were captured at Grayson (RM 5) increasing the season total to 20.

Weir Monitoring.  One Chinook salmon was detected as it passed upstream of the Stanislaus River Weir and zero Chinook salmon were detected passing upstream of the Tuolumne River Weir.

San Joaquin River Conditions. San Joaquin River flows at Vernalis generally increased ranging from 1,910 cfs to 3,861 cfs. Water temperatures in the San Joaquin River ranged between 54.9F and 64.3F and average daily dissolved oxygen (DO) ranged between 9.3 mg/L and 11.6 mg/L.

Delta Exports. Combined total exports (state and federal pumps) generally decreased during the reporting period ranging from 6,322 cfs and 1,441 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 eight days
Figure 1. Calaveras River rotary screw trap at Shelton road.
Rotary Screw Trap
between March 29 and April 11 (Figure 1). A total of 278 O. mykiss were captured, increasing the season total to 824. Daily catch ranged between five and 126 O. mykiss  (Figure 2). Most of the O. mykiss captured, (n=165) were YOY (<100 mm) and were rated as fry (n=130) and parr (n=35). Eleven Age 1+ (100-299 mm) were also captured and were all rated as silvery parr (n=6) and smolt (n=5). Average forklengths and weights are provided in Table 1 for 176 of O. mykiss measured.



No Chinook salmon have been captured this season.
 
Instantaneous temperatures recorded at the trap ranged from 52.5F to 60.0F (Figure 3), and turbidity ranged from 0.21 NTU to 3.52 NTU. Daily average flow fluctuated between 18 cfs and 25 cfs at New Hogan Dam (NHG), between 2 cfs and 47 cfs at Cosgrove Creek (COS), and between 0 cfs and 62 cfs at Bellota (MRS).
 
Table 1. Biosampling data for O. mykiss captured and measured at Shelton Road between March 29 and April 11, 2010. Parentheses indicate range.

O. mykiss data
 
 
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 April 11, 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 April 11, 2010.



 
2009/10 Mokelumne River Juvenile Migration Monitoring
 
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued to sample intermittently between March 29 and April 11 and a total of 62 Chinook salmon were captured increasing the season total to 8,167.

Average daily flows from Camanche Reservoir (CMN) fluctuated between 331 cfs and 407 cfs (Figure 4). Instantaneous temperature ranged between 50.9F and 52.9F and instantaneous turbidity ranged between 1.95 NTU and 2.64 NTU.
 
Two O. mykiss were captured at Vino Farms during the report period increasing the season total to 36.


Flow and Catch

Figure 4. Daily Chinook catches at Vino Farms and Mokelumne River flow recorded by Camanche Reservoir (CMN), between December 1, 2009 and April 11, 2010.
 
The Mokelumne River rotary screw trap at Golf (RM 38) continued to sample intermittently between March 29 and April 11 and a total of seven Chinook salmon were captured increasing the season total to 63 (Figure 5).
 
Average daily flows recorded at Woodbridge (WBR) ranged between 230 cfs and 327 cfs (Figure 5). Instantaneous temperature ranged between 52.5F and 58.1F and instantaneous turbidity ranged between 1.81 NTU and 2.44 NTU.
 
A total of 118 O. mykiss  were captured at Golf during this reporting period increasing the season total to 646 (Note: All 118 O. mykiss had clipped adipose fins suggesting hatchery origin).



Flow and Catch

Figure 5. Daily Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge (WBR), between December 1, 2009 and April 11, 2010.





San Joaquin River Juvenile Migration Monitoring

On March 29, the California Department of Fish and Game initiated Kodiak trawling (Mossdale Trawl) on the San Joaquin River near Mossdale. Ten days (10 tows per day) of Kodiak trawling (Mossdale Trawl) were conducted between March 29 and April 11. A total of 46 juvenile Chinook salmon were caught. Catch ranged between one and nine Chinook per 10 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), between March 29 and April 11 2010.



2010 Stanislaus River Juvenile Migration Monitoring

Stanislaus River seining surveys were conducted on March 31 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. A total of 19 Chinook salmon were captured at Oakdale (RM 40), 62 Chinook
Figure 7. Chinook salmon photographed in the Stanislaus River.
Chinook salmon
salmon were captured at Jacob Meyer (RM 33), and one Chinook salmon was captured at McHenry (RM 28). Forklengths ranged from 42 mm to 78 mm (avg: 58 mm), 32 mm to 71 mm (avg: 59 mm), and 60 mm, respectively (Figure 7).  Average daily flow at Ripon was 280 cfs.

The Stanislaus River rotary screw trap at Oakdale (RM 40)  sampled continuously between March 29 and April 11. A total of 630 juvenile Chinook salmon were captured during the reporting period increasing the season total to 34,574. Daily catch ranged between 14 and 120 Chinook salmon. Average forklengths and weights of Chinook salmon are provided in Table 2 for 498 fish that were measured. Most of the measured Chinook were smolts (n=334), including five larger fish (i.e., > 100 mm), but there were also fry (n=7) and parr (n=157).

No O. mykiss were captured at Oakdale during the reporting period. Nine O. mykiss have been captured so far this season.
 
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between March 29 and April 11, 2010.

Catch Table   
Instantaneous temperature recorded at the trap ranged from 49.0F to 57.7F, and turbidity ranged from 0.20 NTU to 3.56 NTU. Daily average flow increased during the reporting period from 254 cfs to 1,365 cfs at Goodwin Dam (GDW) and 254 cfs to 1,266 cfs at Ripon (RIP) (Figure 8).

No trap efficiency experiments were conducted during the reporting period due to insufficient daily catch.


Flow and Catch

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

Data is not yet available for the Stanislaus River rotary screw trap at Caswell State Park (RM 8) during the reporting period.


2010 Tuolumne River Juvenile Migration Monitoring

The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously between
Figure 9. Chinook salmon captured at Tuolumne River rotary screw trap at Waterford.
Chinook salmon
March 29 and April 11. A total of 89 juvenile Chinook salmon were captured during the reporting period increasing the season total to 1,435. Daily catch ranged between zero and 15 Chinook salmon (Figure 9). Average forklengths and weights of Chinook salmon are provided in Table 3 for 84 fish that were measured. Most of the measured fish were smolt (n=67), but there were also fry (n=2) and parr (n=15).





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


Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between March 29 and April 11, 2010. Parentheses indicate range.

 
Catch Table

Instantaneous temperature taken at the trap ranged from 50.3F to 60.2F, and turbidity ranged from 0.35 NTU to 2.54 NTU. Daily average flow records from La Grange (LGN) increased from 223 cfs to 760 cfs (Figure 10).

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

Figure 10. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2010.
 
The Tuolumne River rotary screw traps at Grayson (RM 5)  sampled continuously between March 29 and April 11. Two Chinook salmon were captured during the reporting period increasing the season total to 20 (Figure 11).

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 51.5F to 61.8F, and turbidity ranged from 1.29 NTU to 9.39 NTU. Daily average flow at Modesto (MOD) increased from 271 cfs to 813 cfs.


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 
 
Between March 29 and April 11 one Chinook salmon was detected passing upstream of the Stanislaus River Weir increasing the season total to 1,281.
 
No O. mykiss  (170 mm) were detected passing upstream during this reporting period. Nine O. mykiss have been detected so far this season.
 
Table 6. Annual Chinook passage at the Stanislaus River Weir 2003-2009.
Passage Table

 
2009/10 Tuolumne River Weir Monitoring
 
Between March 29 and April 11 zero Chinook salmon were detected passing upstream of the Tuolumne River Weir. The season total remains at 301. Trapping was conducted April 2 through April 5 due to high turbidity (i.e., >3 NTU), which precluded species identification using the Vaki system.
 
Zero O. mykiss were detected during this reporting period. The season total remains at one.

 
San Joaquin Conditions
 
Between March 29 and April 11, flows in the San Joaquin River at Vernalis generally increased from 1,910 cfs to 3,861 cfs (Figure 12). Water temperatures in the San Joaquin River fluctuated between 54.9F and 64.3F at Vernalis; between 55.8F and 64.3F at Mossdale; and between 58.8F and 63.1F at Rough 'n Ready Island (Figure 13). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated between 7.2 mg/L and 8.5 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and fluctuated between 9.3 mg/L and 11.6 mg/L at Mossdale (Figure 14).


Flow 

Figure 12. San Joaquin River flow at Vernalis, April 1, 2009 through April 11, 2010.



Temperature 

 

Figure 13. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, April 1, 2009 through April 11, 2010.



 

D.O.
 
 
Figure 14. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, April 1, 2009 through April 11, 2010.



 
Delta Exports 
 
Combined total exports (state and federal pumps) generally decreased during the reporting period ranging from 6,322 cfs to 1,441 cfs. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) decreased from 4,072 cfs to 615 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) decreased from 2,805 cfs to 796 cfs during the reporting period (Figure 15).


 Exports

Figure 15. Daily exports at the federal and state pumping stations, April 1, 2009 through April 11, 2010.

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