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Volume 2008/09, Issue 11
April 20, 2009
In This Issue
2008/09 Calaveras River Juvenile Migration Monitoring
2009 San Joaquin River Juvenile Migration Monitoring
2009 Stanislaus River Juvenile Migration Monitoring
2009 Tuolumne River Juvenile Migration Monitoring
2009 Merced River Juvenile Migration Monitoring
San Joaquin Conditions
Delta Exports
events
 
May 28: SJRRP Fishery Management Group Meeting


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Key Highlights
 
2008/09 Calaveras River Juvenile Migration Monitoring. The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled eight days between March 30 and April 12. A total of 239 O. mykiss were captured during the reporting period, increasing the season total to 665.
 
2009 San Joaquin River Juvenile Migration Monitoring. On March 30, The California Department of Fish and Game (CDFG) initiated Kodiak Trawling on the San Joaquin River near Mossdale. A total of 118 juvenile Chinook salmon were captured during nine days (ten tows per day) of trawling conducted between March 30 and April 12.
 
2009 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 eight Chinook were captured between various locations including three captured for the first time this season downstream of Riverbank.

The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between March 30 and April 12.  A total of 1,185 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 58,990. No O. mykiss were captured during the sampling period.

The rotary screw trap at Caswell State Park (RM 8) sampled continuously between March 30 and April 12.  A total of 20 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 587. No O. mykiss were captured during the sampling period.
 
2009 Tuolumne River Juvenile Migration Monitoring. The seventh TID seining survey was conducted April 7 on the Tuolumne and San Joaquin rivers. A total of 14 juvenile Chinook salmon were captured in the Tuolumne River between Riffle 5 (RM 48.0) and Charles Rd. (RM 24.9) and none were captured in the San Joaquin River.
 
The rotary screw traps at Waterford (RM 30) and Grayson (RM 5) sampled continuously between March 30 and April 12. A total of 107 juvenile Chinook salmon were captured at Waterford during the reporting period, increasing the season total to 2,609. No juvenile Chinook salmon were captured at Grayson; thus, the season total remains at seven. No O. mykiss were captured at either trapping location.
 
2009 Merced River Juvenile Migration Monitoring. The side-by-side rotary screw trap configuration at Hatfield State Park (RM 2) sampled 10 days between March 30 and April 12. No Chinook salmon or O. mykiss were captured.

San Joaquin River Conditions. During the reporting period, flow in the San Joaquin River at Vernalis ranged between 1,050 cfs and 1,367 cfs.
 
Delta Exports. Combined (state and federal pumps) total exports fluctuated during the reporting period ranging between 1,954 cfs and 5,276 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.
 

 
2008/09 Calaveras River Juvenile Migration Monitoring 
 
The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled eight days between March 30 and April 12. A total of 239 O. mykiss were captured during the reporting period, increasing the season total to 665. Daily catch ranged between three and 76 O. mykiss (Figure 1). Average forklengths and weights of O. mykiss are provided in Table 1. Measured O. mykiss (Figure 2) were rated as fry (n=163), parr (n=14), silvery parr (n=6), and smolts (n=12).

No Chinook were captured during this season, thus far.
 
Instantaneous temperatures recorded at the trap ranged from 52F to 53F, and turbidity ranged from 0.3 NTU to 2.2 NTU. Daily average flow exhibited an overall increasing trend ranging between 61 cfs and 206 cfs at New Hogan Dam (NHG), and between three cfs to 97 cfs at Bellota (MRS). Daily average flow fluctuated between zero cfs and four cfs at Cosgrove Creek (COS).
 
Table 1. Biosampling data for O. mykiss captured at Shelton Road between March 30 and April 12, 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
 
On March 30, the California Department of Fish and Game initiated Kodiak Trawling (Mossdale Trawl) on the San Joaquin River near Mossdale. Nine days (ten tows per day) of trawling were conducted between March 30 and April 12. A total of 118 juvenile Chinook salmon were captured during the reporting period. Catch ranged between three and 33 Chinook per ten tows (Figure 3).
 
One O. mykiss was captured on April 8.
 
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
 

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 eight Chinook salmon were captured: four at Oakdale (RM 40), one at Riverbank (RM 33), two at McHenry Recreation Area (RM 28), and one at Caswell (RM 9).  Forklengths ranged from 44 mm to 80 mm (avg: 58 mm).  This was the first survey of the season that Chinook were captured downstream of Riverbank.  Average daily flow at Ripon was 404 cfs.
 
The rotary screw trap at Oakdale (RM 40) sampled continuously between March 30 and April 12.  A total of 1,185 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 58,990. Daily catch ranged between zero and 234 Chinook (Figure 4). Average forklengths and weights of Chinook salmon are provided in Table 2 for 625 fish that were measured. Most measured Chinook were parr (n=267) and smolts (n=323), but some fry (n=35) were also observed.

No O. mykiss were captured during the sampling period.

Three trap efficiency experiments were conducted with releases of 114, 67, and 117 naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). Subsequently after each release, there were 26, 16, and three marked Chinook recaptured, respectively; yielding preliminary capture efficiency estimates of 22.8%, 23.9%, and 2.6%, respectively, at flows ranging between 453 cfs and 707 cfs (Table 3).

Instantaneous temperature recorded at the trap ranged from 52F to 55F, and turbidity ranged from 0.7 NTU to 3.2 NTU. Daily average flow on the Stanislaus River increased during the reporting period ranging between 451 cfs and 708 cfs at Goodwin Dam (GDW), and between 404 cfs and 632 cfs at Ripon (RIP).
 
Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between March 30 and April 12, 2009. Parentheses indicate range.
 
 Oakdale biosample
 

Table 3. Trap efficiency tests conducted at Oakdale between March 30 and April 12, 2009.
 
 Oakdale TE  
 
 
 Oakdale catch

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

 
 Oakdale forklength
 
Figure 5. Individual Chinook salmon forklengths at Oakdale, 2009.
 
The rotary screw trap at Caswell State Park (RM 8) sampled continuously between March 30 and April 12.  A total of 20 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 587. All measured Chinook were rated as smolts (n=19) and average forklength was 85 mm.

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 55F and 61F, and turbidity ranged from 2.0 NTU to 5.2 NTU. Daily average flow at Ripon (RIP) fluctuated between 404 cfs and 632 cfs.

 
2009 Tuolumne River Juvenile Migration Monitoring
 
The seventh TID seining survey was conducted April 7 on the Tuolumne and San Joaquin rivers. A total of 14 juvenile Chinook salmon were captured in the Tuolumne River between Riffle 5 (RM 48.0) and Charles Rd. (RM 24.9) and none were captured in the San Joaquin River. More detailed survey results are available at www.tuolumnerivertac.com/data.htm.
 
The rotary screw trap at Waterford (RM 30) operated continuously between March 30 and April 12. A total of 107 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 2,609. Daily catch ranged between zero and 18 Chinook (Figure 6). Average forklengths and weights of Chinook salmon are provided in Table 4. Most of the measured Chinook were smolts (n=84), but there were also fry (n=11) and parr (n=10).
 
No O. mykiss were captured during the sampling period.
 
Instantaneous temperature recorded at the trap ranged from 58.0F to 64.2F, and turbidity ranged from 0.9 NTU to 3.8 NTU. Daily average flow at La Grange (LGN) was relatively stable ranging between 164 cfs and 166 cfs.
 
No trap efficiency experiments were conducted due to insufficient daily catch.
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between March 30 and April 12, 2009. Parentheses indicate range.
 
Waterford biosample
 

 
Waterford catch 
 
 
Figure 6. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2009.

Waterford lengths
 
 
Figure 7. Individual Chinook salmon forklengths at Waterford, 2009.

The side by side rotary screw trap configuration at Grayson (RM 5) operated continuously between March 30 and April 12. No juvenile Chinook salmon were captured; thus, the season total remains at seven (Figure 8).

No O. mykiss were captured during the sampling period.

Instantaneous temperature recorded at the trap ranged from 61.4F to 66.5F, and turbidity ranged from 2.2 NTU to 7.4 NTU. Daily average flow at Modesto (MOD) was relatively stable during this reporting period ranging between 225 cfs and 284 cfs.

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

 

 
2009 Merced River Juvenile Migration Monitoring
 
The side by side rotary screw trap configuration at Hatfield State Park (RM 2) sampled 10 days between March 30 and April 12. The traps are currently operated on a five days on two days off schedule unless catch or environmental conditions change.

No Chinook salmon or O. mykiss were captured during the reporting period.

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

Instantaneous temperature recorded at the trap ranged from 60F to 64F, and turbidity ranged from 1.9 NTU to 6.4 NTU. Daily average flow at Cressy (CRS) was relatively stable during this reporting period ranging between 221 cfs and 258 cfs.

 

 
San Joaquin Conditions
 
During the reporting period, flow in the San Joaquin River at Vernalis ranged between 1,050 cfs and 1,367 cfs (Figure 9). Average daily water temperatures in the San Joaquin River ranged between 59.5F and 63.0F at Vernalis, between 60.6F and 64.1F at Mossdale; and between 58.7F and 62.8F at Rough 'n Ready Island (Figure 10). Average daily dissolved oxygen (DO) in the San Joaquin River ranged between 7.9 mg/L and 10.0 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 10.5 mg/L and 13.6 mg/L at Mossdale (Figure 11).

SJR Flow

Figure 9. San Joaquin River flow at Vernalis, 2008/09.

SJR Temperature
 
Figure 10. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, 2008/09.

SJR Dissolved Oxygen

Figure 11. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, 2008/09.

 
Delta Exports 
 
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 859 cfs and 2,747 cfs (Figure 12). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 1,094 cfs and 2,529 cfs. Combined (state and federal pumps) total exports fluctuated during the reporting period ranging between 1,954 cfs and 5,276 cfs.
 

 
Exports 

 
Figure 12. Daily exports at the C.W. Jones Pumping Plant (federal) and Harvey O. Banks Pumping Plant (state), 2008/09.

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