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Volume 2008/09, Issue 15
July 21, 2009
In This Issue
2008/09 Calaveras River Juvenile Migration Monitoring
2009 San Joaquin River Juvenile Migration Monitoring
2009 Stanislaus River Juvenile Migration Monitoring
San Joaquin Conditions
Delta Exports
events
 
July 21: SJRRP- Restoration Goal Technical Feedback Group

July 27: Calaveras River Fish Group Meeting

Aug 26: SJRRP Fisheries Management Work Group

Sept 10: Tuolumne River Technical Advisory Committee

links

FISHBIO

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field notes
traps
Key Highlights
 
2008/09 Calaveras River Juvenile Migration Monitoring. The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled sixteen days between June 15 and July 10, which was the last day of the sampling season. A total of 52 O. mykiss were captured during the reporting period, increasing the season total to 1,306.
 
2009 San Joaquin River Juvenile Migration Monitoring. One juvenile Chinook salmon was captured at Mossdale during the reporting period, increasing the season total to 639.

2009 Stanislaus River Juvenile Migration Monitoring. The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled seventeen days between June 15 and July 2, which was the last day of the sampling season.  A total of 49 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 59,721. Three YOY (<100mm) and one Age 1+ (100-299 mm) O. mykiss were captured during the sampling period increasing the season total to 42.

The rotary screw trap at Caswell State Park (RM 8) sampled nine days between June 15 and June 25, which was the last day of the sampling season. No juvenile Chinook salmon were captured during the reporting period.  The preliminary total juvenile Chinook salmon catch for the 2009 trapping season at Caswell State Park is 763 fish.

Stanislaus River seining surveys were conducted during the reporting period.   No Chinook were captured at any of the four sites that were sampled; including Riverbank (RM 33), McHenry Recreation Area (RM 28), Caswell (RM 9) and Two Rivers (RM 0).
 
San Joaquin River Conditions. Flow in the San Joaquin River at Vernalis decreased from 1,550 cfs to 734 cfs. Average daily water temperature in the San Joaquin River recorded at Vernalis, Mossdale, and Rough n' Ready Island ranged between 69.4F and 79.0F. Average daily dissolved oxygen in the San Joaquin River recorded at Mossdale and Rough n' Ready Island ranged between 5.5 mg/L and 14.5 mg/L.

Delta Exports. Combined (state and federal pumps) total exports were fairly stable at about 2,400 cfs until July 2 at which time exports increased to about 10,000 cfs for the remainder of the reporting period.
 
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.
 

 
2008/09 Calaveras River Juvenile Migration Monitoring 
 
The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled sixteen days between June 15 and July 10, which was the last day of the sampling season. A total of 52 O. mykiss were captured during the reporting period, increasing the season total to 1,306. Daily catch ranged between zero and ten O. mykiss (Figure 1). Average forklengths and weights of O. mykiss are provided in Table 1 for 51 O. mykiss that were measured. Measured O. mykiss (Figure 2) were rated as parr (n=15), silvery parr (n=31), and smolts (n=1).

Chinook salmon have not been captured this season.
 
Instantaneous temperatures recorded at the trap ranged from 55F to 59F, and turbidity ranged from 0.4 NTU to 3.1 NTU. Daily average flow fluctuated during the reporting period ranging between 168 cfs and 235 cfs at New Hogan Dam (NHG), between 30 cfs and 54 cfs at Bellota (MRS), and no flow was recorded at Cosgrove Creek (COS).
 
Table 1. Biosampling data for O. mykiss captured at Shelton Road between June 15 and July 10, 2009. Parentheses indicate range.

  Calaveras biosample
 
Calaveras catch 
 
Figure 1. Daily O. mykiss catch at Shelton Road and Calaveras River flow recorded by combined New Hogan Dam and Cosgrove Creek (NHG + COS), 2008/09.
 

 
 Calaveras lengths

Figure 2. Individual O. mykiss forklengths at Shelton Road, 2008/09.


 
2009 San Joaquin River Juvenile Migration Monitoring
 
California Department of Fish and Game conducted seven days (ten tows per day) of Kodiak Trawling (Mossdale Trawl) on the San Joaquin River near Mossdale between June 15 and June 30. One juvenile Chinook salmon was captured during the reporting period, increasing the season total to 639. Catch ranged between zero and one Chinook per ten tows (Figure 3).  This was the last period of trawling for The Department of Fish and Game La Grange office and effort was transferred to the United States Fish and Wildlife Service Bay-Delta Office. Data from the Bay-Delta office will be reported in future issues if available.
 
Mossdale catch
 
Figure 3. Chinook salmon catch (per ten tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2009.
 

 

 
2009 Stanislaus River Juvenile Migration Monitoring
 
The rotary screw trap at Oakdale (RM 40) sampled seventeen days between June 15 and July 2.  A total of 49 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 59,721. Daily catch ranged between zero and 19 Chinook (Figure 4). Average forklengths and weights of Chinook salmon are provided in Table 2 for 47 Chinook that were measured. Measured Chinook were rated as parr (n=3) and smolts (n=44).

Three YOY (<100mm) and one Age 1+ (100-299 mm) O. mykiss were captured during the sampling period increasing the season total to 42 O. mykiss. Average forklengths and weights of O. mykiss are provided in Table 2. The O. mykiss were rated as parr (n=2) and silvery parr (n=2).

No trap efficiency experiments were conducted due to insufficient daily catch.
Instantaneous temperature recorded at the trap ranged from 54F to 62F, and turbidity ranged from 0.9 NTU to 9.0 NTU. Daily average flow on the Stanislaus River ranged between 250 cfs and 1250 cfs at Goodwin Dam (GDW), and between 290 cfs and 1,130 cfs at Ripon (RIP).

 
Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between June 15 and July 2, 2009. Parentheses indicate range.

Oakdale biosample
 
 
 

 
Oakdale catch
 
 

Figure 4. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded by Goodwin Dam (GDW) and Ripon (RIP), 2009.

 

 Oakdale lengths
 
Figure 5. Individual Chinook salmon forklengths at Oakdale, 2009.
 
The rotary screw trap at Caswell State Park (RM 8) sampled nine days between June 15 and June 25, which was the last day of the sampling season.

No juvenile Chinook salmon were captured during the reporting period.  The preliminary total juvenile Chinook salmon catch for the 2009 trapping season at Caswell State Park is 763 fish.

No O. mykiss were captured during the sampling period.

No trap efficiency experiments were conducted due to insufficient daily catch.
Instantaneous temperature recorded at the trap ranged from 63F to 71F, and turbidity ranged from 2.48 NTU to 7.32 NTU. Daily average flow at Ripon (RIP) fluctuated between 382 cfs and 1117 cfs.

Stanislaus River seining surveys were conducted on July 10. One Chinook was captured at McHenry Recreation Area (RM 28), forklength 89 mm. Other sites sampled were Oakdale Recreation Area (RM 40), Riverbank (RM 33), Caswell (RM 9) and Two Rivers (RM 0).


 
San Joaquin Conditions
 
During the reporting period, flow in the San Joaquin River at Vernalis was decreased from 1,550 cfs to 734 cfs (Figure 6). Average daily water temperatures in the San Joaquin River fluctuated during the reporting period ranging between 69.4F and 77.3F at Vernalis, between 72.1F and 78.0F at Mossdale; and between 73.6F and 79.0F at Rough 'n Ready Island (Figure 7). Average daily dissolved oxygen (DO) in the San Joaquin River ranged between 5.5 mg/L and 6.7 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 9.9 mg/L and 14.5 mg/L at Mossdale (Figure 8).
 
 
 SJR flow

Figure 6. San Joaquin River flow at Vernalis, 2008/09.

 

 SJR temperature

 
Figure 7. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, 2008/09.
 

 
 SJR Dissolved oxygen

Figure 8. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, 2008/09.

 
Delta Exports 
 
Combined (state and federal pumps) total exports were fairly stable at about 2,400 cfs until July 2 at which time exports increased to about 10,000 cfs for the remainder of the reporting period. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 999 cfs and 4,070 cfs (Figure 9). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 49 cfs and 7,270 cfs. 
 

Exports 

 
Figure 9. Daily exports at the C.W. Jones Pumping Plant (federal) and Harvey O. Banks Pumping Plant (state), 2008/09.

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