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Volume 2008/09, Issue 10
April 9, 2009
In This Issue
2008/09 Calaveras 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
 
April 9: SJRRP Fishery Management Group Meeting


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FISHBIO

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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 16 and March 29. A total of 85 O. mykiss were captured during the reporting period, increasing the season total to 426.

2009 Stanislaus River Juvenile Migration Monitoring.  Stanislaus River seining surveys were conducted on March 18 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. A total of 9 Chinook salmon were captured at Oakdale (RM 40) and 6 Chinook were captured at Riverbank (RM 33).

The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between March 16 and March 29. A total of 839 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 57,805. No O. mykiss were captured during the sampling period.

The rotary screw trap at Caswell State Park (RM 8) sampled continuously between February 16 and March 15.  A total of 209 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 515. No O. mykiss were captured during the sampling period.
 
2009 Tuolumne River Juvenile Migration Monitoring. The sixth TID seining survey was conducted March 24 on the Tuolumne and San Joaquin rivers. A total of 103 juvenile Chinook salmon were captured in the Tuolumne River between Riffle 5 (RM 48.0) and Hickman Bridge (RM 31.6) 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 16 and March 29. A total of 156 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 2,502. No juvenile Chinook salmon were captured, 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) is scheduled to begin sampling on March 30.

San Joaquin River Conditions. During the reporting period, flows in the San Joaquin River at Vernalis exhibited and overall decreasing trend from 1,430 cfs to 1,130 cfs.
 
Delta Exports. Combined (state and federal pumps) total exports exhibited and overall decreasing trend ranging between 7,710 cfs and 3,720 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 16 and March 29. A total of 85 O. mykiss were captured during the reporting period, increasing the season total to 426. Daily catch ranged between one and 23 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=63), parr (n=7), silvery parr (n=12), and smolts (n=3).

No Chinook were captured during this reporting period.

Instantaneous temperatures recorded at the trap ranged from 52F to 57F, and turbidity ranged from 1.5 NTU to 2.4 NTU. Daily average flow exhibited an overall increasing trend ranging between 24 cfs and 64 cfs at New Hogan Dam (NHG), and between 25 cfs to 64 cfs at Bellota (MRS). Daily average flow fluctuated between zero cfs and three cfs at Cosgrove Creek (COS).
 
Table 1. Biosampling data for O. mykiss captured at Shelton Road between March 16 and March 29, 2009. Parentheses indicate range.
 
 Calaveras Biosample
 

Calaveras RBT 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 RBT lengths 

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


 
2009 Stanislaus River Juvenile Migration Monitoring
 
Stanislaus River seining surveys were conducted on March 18 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River.

A total of 9 Chinook salmon were captured at Oakdale (RM 40) and 6 Chinook were captured at Riverbank (RM 33).  Forklengths ranged from 36 to 52 mm (avg: 43.5 mm).  No salmon were captured downstream of Riverbank.  Average daily flow at Ripon was 228 cfs.

The rotary screw trap at Oakdale (RM 40) sampled continuously between March 16 and March 29.  A total of 839 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 57,805. Daily catch ranged between 14 and 141 Chinook (Figure 3). Average forklengths and weights of Chinook salmon are provided in Table 2 for 571 fish that were measured. Most measured Chinook were parr (n=318) and smolts (n=163), but some fry (n=90) were also observed.

No O. mykiss were captured during the sampling period.

Two trap efficiency experiments were conducted with releases of 64 and 57 naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). Subsequently after release, 11 and 8 marked Chinook were recaptured; yielding preliminary capture efficiency estimates between 17.2% and 14.0% at flows ranging between 227 cfs and 351 cfs (Table 3).

Instantaneous temperature recorded at the trap ranged from 51F to 56F, and turbidity ranged from 0.4 NTU to 3.5 NTU. Daily average flow on the Stanislaus River increased during the reporting period ranging between 451 cfs and 454 cfs at Goodwin Dam (GDW), and between 367 cfs and 382 cfs at Ripon (RIP).
 
Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between March 16 and March 29, 2009. Parentheses indicate range.
 
 Oakdale Biosample
 
 
Table 3. Trap efficiency tests conducted at Oakdale between March 16 and March 29, 2009.
 
Oakdale TE

 
   
 
Oakdale Catch 

 
Figure 3. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded by Goodwin Dam (GDW) and Ripon (RIP), 2009.
 
 Oakdale forklengths
 
 
Figure 4. Individual Chinook salmon forklengths at Oakdale, 2009.
 
 
The rotary screw trap at Caswell State Park (RM 8) sampled continuously between March 16 and March 29.  A total of 209 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 515. Captured and measured Chinook were rated as parr (n=32) and smolts (176). Average forklength was 77 mm for parr, 85 mm for smolts.
 
No O. mykiss were captured during the sampling period.

One trap efficiency experiment was conducted using 40 naturally spawned juvenile Chinook salmon marked upper caudal fin pink (UCP). Six marked Chinook were recaptured; yielding a preliminary capture efficiency estimate of 15.0% at a flow of 315 cfs (Table 4).

Instantaneous temperature recorded at the trap ranged from 55F to 60F, and turbidity ranged from 1.9 NTU to 5.2 NTU. Daily average flow at Ripon (RIP) fluctuated between 367 cfs and 382 cfs.
 
Table 4. Trap efficiency tests conducted at Caswell between March 16 and March 29, 2009.
 
Caswell TE

 
2009 Tuolumne River Juvenile Migration Monitoring 
 
The sixth TID seining survey was conducted March 24 on the Tuolumne and San Joaquin rivers. A total of 103 juvenile Chinook salmon were captured in the Tuolumne River between Riffle 5 (RM 48.0) and Hickman Bridge (RM 31.6) 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 16 and March 29. A total of 156 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 2,502. Daily catch ranged between zero and 22 Chinook (Figure 5). Average forklengths and weights of Chinook salmon are provided in Table 5. Most of the measured Chinook were fry (n=86), but there were also parr (n=38) and smolts (n=41).

No O. mykiss were captured during the sampling period.

Instantaneous temperature recorded at the trap ranged from 51.8F to 62.6F, and turbidity ranged from 1.3 NTU to 6.6 NTU. Daily average flow at La Grange (LGN) was relatively stable ranging between 163 cfs and 168 cfs.

One trap efficiency experiment was conducted using 35 naturally spawned juvenile Chinook salmon marked caudal fin orange (CFO). One marked Chinook was recaptured; yielding a preliminary capture efficiency estimate of 2.9% at a flow of 168 cfs (Table 6).

Table 5. Biosampling data for Chinook salmon captured and measured at Waterford between March 16 and March 29, 2009. Parentheses indicate range.
 
Waterford TE
 
 
Table 6. Trap efficiency tests conducted at Waterford between March 16 and March 29, 2009.
 
 Waterford Biosample
 
 
 
Waterford catch
 

Figure 5. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2009.
 
 Waterford Forklength
 
Figure 6. Individual Chinook salmon forklengths at Waterford, 2009.
 

The rotary screw traps at Grayson (RM 5) operated continuously between March 16 and March 29. No juvenile Chinook salmon were captured, thus, the season total remains at seven (Figure 7).

No O. mykiss were captured during the sampling period.

Instantaneous temperature recorded at the trap ranged from 60.2F to 69.2F, and turbidity ranged from 2.6 NTU to 9.3 NTU. Daily average flow at Modesto (MOD) was relatively stable during this reporting period ranging between 219 cfs and 249 cfs.

No trap efficiency experiments were conducted due to insufficient daily catch.
 
 
 Grayson Catch
 
Figure 7. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2009.

 
2009 Merced River Juvenile Migration Monitoring
 
The side by side rotary screw trap configuration at Hatfield State Park (RM 2) is scheduled to begin sampling on March 30.

 

 
San Joaquin Conditions
 
During the reporting period, flows in the San Joaquin River at Vernalis exhibited and overall decreasing trend from 1,430 cfs to 1,130 cfs (Figure 8). Average daily water temperatures in the San Joaquin River exhibited and overall increasing trend ranging between 58.8F and 65.4F at Vernalis, between 59.4F and 66.1F at Mossdale; and between 57.8F and 61.6F at Rough 'n Ready Island (Figure 9). Average daily dissolved oxygen (DO) in the San Joaquin River exhibited and overall increasing trend ranging between 8.2 mg/L and 9.9 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 12.3 mg/L and 14.5 mg/L at Mossdale (Figure 10).


SJR Flow


Figure8. San Joaquin River flow at Vernalis, 2008/09.
 


SJR Temperature


Figure 9. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, 2008/09.
 


SJR DO


Figure 10. 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 1,880 cfs and 4,230 cfs (Figure 11). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 1,840 cfs and 3,560 cfs. Combined (state and federal pumps) total exports exhibited and overall decreasing trend ranging between 7,710 cfs and 3,720 cfs.
 
Exports 

 
Figure 11. Daily exports at the C.W. Jones Pumping Plant (federal) and Harvey O. Banks Pumping Plant (state), 2008/09.

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