| Volume 2008/09, Issue 8 |
March 4, 2009 | |
March 10-11: CALFED Science Program Public Workshop - Effects of Ammonia on Delta
March 12: TRTAC
March 30: SWRCB Bay-Delta Plan Scoping Meeting - Focused on Delta Salinity and San Joaquin River Flows
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Key Highlights
2008/09 Calaveras River Juvenile Migration Monitoring. A total of 55 O. mykiss were captured during the reporting period, increasing the season total to 212.
2009 Stanislaus River Juvenile Migration Monitoring. Seining surveys were conducted on February 3 and February 19 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. A total of 208 juvenile Chinook were captured between Oakdale and Riverbank (RM 33).
The Stanislaus River rotary screw trap at Oakdale sampled continuously between February 2 and February 22. A total of 12,094 juvenile Chinook salmon were captured during the reporting period increasing the season total to 41,369. One adult (≥300 mm) and 11 Age 1+ (100-299 mm) O. mykiss smolts were also captured.
The rotary screw trap at Caswell State Park (RM 8) sampled continuously between January 13 and February 13. A total of 16 juvenile Chinook salmon and two Age 1+ O. mykiss smolts were captured.
2009 Tuolumne River Juvenile Migration Monitoring. The third TID seining survey was conducted February 9 on the Tuolumne and San Joaquin rivers. A total of 162 juvenile Chinook salmon were captured in the Tuolumne River between Old La Grange Bridge (RM 50.5) and Hickman Bridge (RM 31.6) and none were captured on the San Joaquin River.
The rotary screw traps at Waterford (RM 30) and Grayson (RM 5) sampled continuously between February 2 and February 22. A total of 280 juvenile Chinook salmon were captured at Waterford during the reporting period increasing the season total to 656. One Age 1+ O. mykiss was captured at Waterford as well. No salmonids were captured at Grayson during the reporting period.
San Joaquin River Conditions. During the reporting period, flows in the San Joaquin River at Vernalis fluctuated between 1,185 cfs and 1,894 cfs.
Delta Exports. Combined total exports (state and federal pumps) ranged between 1,922 cfs and 5,695 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. | |
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2008/09 Calaveras River Juvenile Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled 12 days between February 2 and February 22. A total of 55 O. mykiss were captured during the reporting period, increasing the season total to 212. Daily catch ranged between zero and 21 O. mykiss (Figure 1). Average forklengths and weights of O. mykiss are provided in Table 1. The O. mykiss captured and measured were rated as parr (n=15), silvery parr (n=28), and smolts (n=12).
No Chinook were captured during this reporting period.
Instantaneous temperatures recorded at the trap ranged from 43�F to 49�F, and turbidity ranged from 0.3 NTU to 5.7 NTU. Daily average flow fluctuated between 19 cfs and 48 cfs at New Hogan Dam (NHG), zero cfs to 125 cfs at Cosgrove Creek (COS), and zero cfs to 350 cfs at Bellota (MRS).
Table 1. Biosampling data for O. mykiss captured at Shelton Road between February 2 and February 22, 2009. Parentheses indicate range.
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.
Figure 2. Individual O. mykiss forklengths at Shelton Road, 2008/09.
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2009 Stanislaus River Juvenile Migration Monitoring
Stanislaus River seining surveys were conducted on February 3 and February 19 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River.
On February 3, a total of 107 Chinook salmon were captured at Oakdale (RM 40) and 16 at Riverbank (RM 33). Forklengths ranged from 31 to 51 mm (avg: 38.6 mm). No salmon were captured downstream of Riverbank. Average daily flow at Ripon was 210 cfs.
On February 19, 55 Chinook salmon were captured at Oakdale (RM 40) and 30 at Riverbank (RM 33). Forklengths ranged from 33 to 65 mm (avg: 40.3 mm). No salmon were captured downstream of Riverbank. Average daily flow at Ripon was 346 cfs.
 The rotary screw trap at Oakdale (RM 40) sampled continuously between February 2 and February 22. A total of 12,094 juvenile Chinook salmon were captured during the reporting period increasing the season total to 41,369. Daily catch ranged between four and 2,104 Chinook (Figure 4). Average forklengths and weights of Chinook salmon are provided in Table 2 for 1,489 fish that were measured.
Figure 3. Chinook smolt in viewing box.Most of the measured Chinook were fry (n=1,141) but parr (n=314) and smolts (n=34) were also observed (Figure 3).
One adult (≥300 mm) and 11 Age 1+ (100-299 mm) O. mykiss smolts were captured during this reporting period, increasing the season total to 18 (Table 2).
Instantaneous temperature recorded at the trap ranged from 48�F to 53�F, and turbidity ranged from 0.3 NTU to 2.7 NTU. Daily average flow at Goodwin Dam (GDW) fluctuated between 165 cfs and 357 cfs, and flows at Ripon (RIP) fluctuated between 206 cfs and 361 cfs.
Three trap efficiency experiments were conducted with releases ranging between 243 and 334 naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). The number of marked Chinook that were recaptured varied from 78 to 137, yielding preliminary capture efficiency estimates between 32.1% and 47.0% at flows ranging between 168 cfs and 322 cfs (Table 3).
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between February 2 and February 22, 2009. Parentheses indicate range.
Table 3. Trap efficiency tests conducted at Oakdale between February 2 and February 22, 2009.
Figure 4. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded by Goodwin Dam (GDW) and Ripon (RIP), 2009.
The rotary screw trap at Caswell State Park (RM 8) sampled continuously between January 13 and February 13. A total of 16 juvenile Chinook salmon were captured. Average forklength was 39 mm for fry; no other lifestages were captured.
Two O. mykiss smolts were captured during the reporting period (245 mm on January 30 and 221 mm on February 5).
No trap efficiency experiments were conducted due to insufficient daily catch.
Instantaneous temperature recorded at the trap ranged from 46.4�F to 53.2�F, and turbidity ranged from 0.7 NTU to 6.0 NTU. Daily average flow at Goodwin Dam (GDW) fluctuated between 165 cfs and 357 cfs, and flows at Ripon (RIP) fluctuated between 206 cfs and 361 cfs.
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2009 Tuolumne River Juvenile Migration Monitoring
The third TID seining survey was conducted February 9 on the Tuolumne and San Joaquin rivers. A total of 162 juvenile Chinook salmon were captured in the Tuolumne River between Old La Grange Bridge (RM 50.5) 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 February 2 and February 22. A total of 280 juvenile Chinook salmon were captured during the reporting period increasing the season total to 656. Daily catch ranged between zero and 58 Chinook (Figure 6) and size ranged from 30-118 mm. Figure 6. Age 1+ O. mykiss in viewing box.
Average forklengths and weights of Chinook salmon are provided in Table 4. Most of the measured Chinook were fry (n=262), but eight parr and 10 smolts were measured as well.
One Age 1+ (100-299 mm) O. mykiss silvery parr was captured during this reporting period (Table 4, Figure 5), which is the only O. mykiss captured this season, thus far.
Instantaneous temperature recorded at the trap ranged from 50.0�F to 56.8�F, and turbidity ranged from 0.5 NTU to 18.9 NTU. Daily average flow at La Grange (LGN) was relatively stable ranging between 165 cfs and 168 cfs.
Three trap efficiency experiments were conducted with releases ranging between 31 and 47 naturally spawned juvenile Chinook salmon marked caudal fin orange (CFO). The number of marked Chinook that were recaptured varied from one to six, yielding preliminary capture efficiency estimates between 2.8% and 16.1% at flows ranging between 167 cfs and 168 cfs (Table 5).
Table 4. Biosampling data for Chinook salmon and O. mykiss captured and measured at Waterford between February 2 and February 22, 2009. Parentheses indicate range.
Table 5. Trap efficiency tests conducted at Waterford between February 2 and February 22, 2009.
Figure 6. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2009.
The rotary screw traps at Grayson (RM 5) operated continuously between February 2 and February 22. No salmonids were captured and no trap efficiency experiments could be conducted during this reporting period.
Instantaneous temperature recorded at the trap ranged from 51.9�F to 58.6�F, and turbidity ranged from 0.4 NTU to 10.6 NTU. Daily average flow at Modesto (MOD) fluctuated during this reporting period ranging between 218 cfs and 353 cfs. |
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San Joaquin Conditions
During the reporting period, flows in the San Joaquin River at Vernalis ranged between 1,185 cfs and 1,894 cfs (Figure 7). Average daily water temperatures in the San Joaquin River ranged between 50.9�F and 55.5�F at Vernalis, between 50.9�F and 55.3�F at Mossdale; and between 48.5�F and 52.8�F at Rough 'n Ready Island (Figure 8). Average daily dissolved oxygen (DO) in the San Joaquin River ranged between 9.2 mg/L and 10.7 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 9.4 mg/L and 10.3 mg/L at Mossdale (Figure 9).
Figure 7. San Joaquin River flow at Vernalis, 2008/09.
Figure 8. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, 2008/09.
Figure 9. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, 2008/09.
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Delta Exports
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 506 cfs and 2,803 cfs (Figure 10). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 919 cfs and 2,907 cfs. Combined total exports (state and federal pumps) ranged between 1,922 cfs and 5,695 cfs.  Figure 10. Daily exports at the C.W. Jones Pumping Plant (federal) and Harvey O. Banks Pumping Plant (state), 2008/09.
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