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Volume 2009/10, Issue 11
April 6, 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
ASLO & NABS Meeting:
June 6-11
 
TRTAC Meeting:
June 10

links

FISHBIO

 
 
Atlantic Salmon Federation

signup
field notes
omykiss
  Photo by FISHBIO.
 
Key Highlights
 
Calaveras River Juvenile Migration Monitoring. A total of 97 O. mykiss were captured at Shelton Road (RM 28), increasing the season total to 546.

Mokelumne River Juvenile Migration Monitoring. A total of 1,043 Chinook salmon were captured at Vino Farms (RM 54) increasing the season total to 8,105 and a total of 36 Chinook salmon were captured at Golf (RM 38) increasing the season total to 56.

Stanislaus River Juvenile Migration Monitoring. On March 1 and March 17 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), McHenry (RM 28), Caswell (RM 9) and at Two Rivers (RM 0).

A total of 3,109 Chinook salmon were captured in the Oakdale rotary screw trap (RM 40), increasing the season total to 33,944.

At Caswell State Park (RM 8), a total of 19 Chinook salmon were captured, increasing the season total to 364.

Tuolumne River Juvenile Migration Monitoring. A total of 363 Chinook salmon were captured at Waterford (RM 30), increasing the season total to 1,351. Three Chinook salmon were captured at Grayson (RM 5), increasing the season total to 18.

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

San Joaquin River Conditions. San Joaquin River flows at Vernalis generally decreased, ranging from 4,926 cfs and 2,172 cfs. Water temperatures in the San Joaquin River ranged between 54.6F and 63.0F and average daily dissolved oxygen (DO) ranged between 8.5 mg/L and 11.7 mg/L.

Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period ranging between 4,646 cfs and 9,395 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 14 days between March 1 and March 28. A total of 97 O. mykiss were captured, increasing the season total to 546. Daily catch ranged between zero and 27 O. mykiss (Figure 1). Most of the O. mykiss captured, (n=70) were YOY (<100 mm) and were rated as fry (n=69) and parr (n=1). Seventeen Age 1+ (100-299 mm) were also captured and were all rated as silvery parr (n=14) and smolt (n=3). Average forklengths and weights are provided in Table 1 for 87 of the O. mykiss measured.

No Chinook salmon have been captured this season.
 
Instantaneous temperatures recorded at the trap ranged from 49.5F to 56.0F (Figure 2), and turbidity ranged from 0.12 NTU to 14.80 NTU. Daily average flow fluctuated between 19 cfs and 51 cfs at New Hogan Dam (NHG), between 2 cfs and 206 cfs at Cosgrove Creek (COS), and between 0 cfs and 1,076 cfs at Bellota (MRS).
 
 
Table 1. Biosampling data for O. mykiss captured and measured at Shelton Road between March 1 and March 28, 2010. Parentheses indicate range.
 
Calaveras biosample
 

 
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 March 28, 2010.

 

 
 Temperature

Figure 2. Daily O. mykiss catch at Shelton Road and Calaveras River temperature recorded instantaneously at trap location between November 1, 2009 and March 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 March 1 and March 28 and a total of 1,043 Chinook salmon were captured, increasing the season total to 8,105.

Average daily flows from Camanche Reservoir (CMN) fluctuated between 330 cfs and 445 cfs (Figure 3). Instantaneous temperature ranged between 49.8F and 52.0F and instantaneous turbidity ranged between 1.82 NTU and 10.10 NTU.
 
Twenty-two O. mykiss were captured at Vino Farms during the report period, increasing the season total to 34 (Note: 18 O. mykiss had clipped adipose fins suggesting hatchery origin).


 

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 March 28, 2010.
 
The Mokelumne River rotary screw trap at Golf (RM 38) continued to sample intermittently between March 1 and March 28 and a total of 36 Chinook salmon were captured increasing the season total to 56 (Figure 4).
 
Average daily flows recorded at Woodbridge (WBR) ranged between 107 cfs and 333 cfs (Figure 4). Instantaneous temperature ranged between 51.6F and 57.7F and instantaneous turbidity ranged between 1.82 NTU and 9.46 NTU.
 
Three hundred and sixty-nine O. mykiss were captured at Golf during this reporting period increasing the season total to 528 (Note: Three hundred and sixty-three O. mykiss had clipped adipose fins suggesting 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 March 28, 2010.




2010 Stanislaus River Juvenile Migration Monitoring

Stanislaus River seining surveys were conducted on March 1 and March 17 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. On March 1 a total of 33 Chinook salmon were captured at McHenry (RM 28), 3 Chinook salmon were captured at Caswell (RM 9), and 2 Chinook salmon were captured at Two Rivers (RM 0).  On March 17 a total of 10 Chinook salmon were captured at Oakdale (RM 40) and 23 Chinook salmon were captured at Jacob Meyers (RM 33). Forklengths ranged from 32 to 62 mm (avg: 41 mm) and 34 to 62 mm (avg: 48 mm), respectively.  Average daily flow at Ripon was 966 cfs and 328 cfs, respectively.

The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between March 1 and March 28. A total of 3,109 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 33,944. Daily catch ranged between 11 and 709 Chinook salmon. Average forklengths and weights of Chinook salmon are provided in Table 2 for 819 fish that were measured. Most of the measured Chinook were parr (n=586) but there were also a considerable number of fry (n=504) and smolts (n=272), including 22 larger fish (i.e., > 100 mm).

Two 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 the Oakdale rotary screw trap between March 1 and March 28, 2010.

Oakdale Biosample   
 
Instantaneous temperature recorded at the trap ranged from 49.4F to 55.5F, and turbidity ranged from 0.03 NTU to 4.15 NTU. Daily average flow decreased during the reporting period from 838 cfs to 199 cfs at Goodwin Dam (GDW) and 967 cfs to 238 cfs at Ripon (RIP) (Figure 5).

Three trap efficiency experiments were conducted with naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). Preliminary capture efficiency estimates from these releases were 13.1%, 24.4%, and 25.9% at flows of 365 cfs, 203 cfs, and 207 cfs, respectively (Table 3).
 
 
Table 3. Trap efficiency experiments conducted at Oakdale between March 1 and March 28, 2010.
 
Oakdale efficiency



Flow and Catch

Figure 5. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) for 2010.

The Stanislaus River rotary screw trap at Caswell State Park (RM 8) sampled intermittently between March 1 and March 14.  A total of 19 juvenile Chinook salmon were captured during the reporting period increasing the season total to 364. Daily catch ranged between 0 and 8 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 51.3F and 55.9F, and turbidity ranged from 1.41 NTU to 5.86 NTU. Daily average flow at Ripon (RIP) decreased from 967 cfs to 288 cfs.




2010 Tuolumne River Juvenile Migration Monitoring

The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously between March 1 and March 28. A total of 363 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 1,351. Daily catch ranged between zero and 48 Chinook salmon (Figure 6). Average forklengths and weights of Chinook salmon are provided in Table 4 for the 362 fish that were measured. Most of the measured fish were fry (n=279) but there were also, parr (n=49) and smolts (n=34).

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

Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between March 1 and March 28, 2010. Parentheses indicate range.
 
Waterford biosample

Instantaneous temperature taken at the trap ranged from 50.0F to 60.9F, and turbidity ranged from 0.28 NTU to 15.50 NTU. Daily average flow records from La Grange (LGN) fluctuated between 221 cfs and 761 cfs.

Four trap efficiency experiments were conducted using naturally spawned juvenile Chinook salmon marked caudal fin orange (CFO). Preliminary capture efficiency estimates from these releases were 13.9%, 18.2%, 12.5%, and 8.6% at flows between 223 cfs and 227 cfs (Table 5).

Table 5. Trap efficiency tests conducted at Waterford between March 1 and March 28, 2010.
 
 Waterford efficiency

Flow and Catch

Figure 6. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD) for 2010. 
 
The Tuolumne River rotary screw traps at Grayson (RM 5) sampled continuously Grayson trapsbetween March 1 and March 28 (Figure 7). Three Chinook salmon were captured during the reporting period increasing the season total to 18 (Figure 8).

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 51.0F to 62.2F, and turbidity ranged from 0.99 NTU to 50.10 NTU. Daily average flow at Modesto (MOD) has only been available since March 24 and ranged between 292 cfs and 505 cfs.


Flow and Catch

Figure 8. Daily Chinook salmon catch at Grayson and Tuolumne River flow at La Grange (LGN) and Modesto (MOD) for 2010.

 
2009/10 Stanislaus River Weir Monitoring 
 
Between March 1 and March 28 a total of five Chinook salmon were detected as they passed upstream of the Stanislaus River Weir, increasing the season total to 1,280. Daily passage ranged between 0 and 2 Chinook salmon. Trapping was conducted March 5 through March 7 due to high turbidity (e.g. >3 NTU), which precluded species identification using the Vaki system.
 
One O. mykiss (170 mm) was 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.
Chinook passage

 
2009/10 Tuolumne River Weir Monitoring
 
Between March 1 and March 23, three Chinook salmon were detected as they passed upstream of the Tuolumne River Weir, increasing the season total to 301. Due to database software issues, data collected after March 23 are not yet available. Daily passage ranged between 0 and 1 Chinook. Trapping was conducted March 2 through March 4 due to high turbidity (e.g. >3 NTU), which precluded species identification using the Vaki system.
 
No O. mykiss were detected during this reporting period. The season total remains at one.

 
San Joaquin Conditions
 
Between March 1 and March 28, flows in the San Joaquin River at Vernalis generally decreased from 4,926 cfs to 2,172 cfs (Figure 9). Water temperatures in the San Joaquin River fluctuated between 54.6F and 63.0F at Vernalis; between 55.2F and 63.9F at Mossdale; and between 55.3F and 63.1F at Rough 'n Ready Island (Figure 10). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated between 8.2 mg/L and 10.4 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island) and fluctuated between 7.8 mg/L and 11.7 mg/L at Mossdale (Figure 11).


Flow 

Figure 9. San Joaquin River flow at Vernalis, March 1, 2009 through March 28, 2010.


Temperature 

 

Figure 10. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, March 1, 2009 through March 28, 2010.


 

D.O.
 
 
Figure 11. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, March 1, 2009 through March 28, 2010.


 
Delta Exports 
 
Combined total exports (state and federal pumps) fluctuated between 4,646 cfs and 9,395 cfs during the reporting period. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 1,889 cfs and 5,225 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 2,441 cfs to 4,174 cfs during the reporting period (Figure 12).



 Exports


Figure 12. Daily exports at the federal and state pumping stations, March 1, 2009 through March 28, 2010.

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