| Volume 2008/09, Issue 7 |
February 13, 2009 | |
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Key Highlights
2008/09 Calaveras River Juvenile Migration Monitoring. A total of 102 O. mykiss were captured at Shelton Rd (RM 28) during the reporting period, increasing the season total to 157.
2009 Stanislaus River Juvenile Migration Monitoring. Seining surveys were conducted on January 9 and January 21 at various locations between Oakdale and the Confluence with the San Joaquin River. During the surveys a white sturgeon was observed swimming in shallow waters around the Highway 99 Bridge.
The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between January 19 and February 1. A total of 23,241 juvenile Chinook salmon were captured during the reporting period increasing the season total to 29,275.
2009 Tuolumne River Juvenile Migration Monitoring. The second TID seining survey was conducted January 27 on the Tuolumne and San Joaquin rivers. A total of 39 juvenile Chinook salmon were captured in the Tuolumne River.
The rotary screw traps at Waterford (RM 30) and Grayson (RM 5) sampled continuously between January 19 and February 1. A total of 368 juvenile Chinook salmon were captured at Waterford during the reporting period increasing the season total to 376. No salmonids were captured at Grayson during the reporting period.
2009 Tuolumne River Juvenile Migration Monitoring. The second TID seining survey was conducted January 27 on the Tuolumne and San Joaquin rivers. A total of 39 juvenile Chinook salmon were captured in the Tuolumne River.
The rotary screw traps at Waterford (RM 30) and Grayson (RM 5) sampled continuously between January 19 and February 1. A total of 368 juvenile Chinook salmon were captured at Waterford during the reporting period increasing the season total to 376. 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 1,034 cfs and 1,433 cfs.
Delta Exports. Combined total exports (state and federal pumps) ranged between 2,012 cfs and 5,195 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 10 days between January 19 and February 1. A total of 102 O. mykiss (Figure 1) were captured during the reporting period, increasing the season total to 157. Daily catch ranged between one and 27 O. mykiss (Figure 2). Average forklengths and weights of O. mykiss are provided in Table 1. The O. mykiss captured and measured were rated as parr (n=32), silvery parr (n=50), and smolts (n=18).
No Chinook were captured during this reporting period.
Instantaneous temperatures recorded at the trap ranged from 44�F to 50�F, and turbidity ranged from 0.2 NTU to 10.9 NTU. Daily average flow fluctuated between 37 cfs and 51 cfs at New Hogan Dam (NHG), zero cfs to 89 cfs at Cosgrove Creek (COS), and zero cfs to 80 cfs at Bellota (MRS).
Table 1. Biosampling data for O. mykiss captured at Shelton Road between January 19 and February 1, 2009. Parentheses indicate range.
Figure 2. 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 3. Individual O. mykiss forklengths at Shelton Road, 2008/09. |
2009 Stanislaus River Juvenile Migration Monitoring
Stanislaus River seining surveys were conducted on January 9 and January 21 at various locations between Oakdale (RM 40) and the Confluence with the San Joaquin River.
During the January 9 survey, a total of 4 Chinook salmon were captured at Oakdale (RM 40). Forklengths ranged from 33 to 38 mm (avg: 35 mm). No salmon were captured downstream of Oakdale. Average daily flow at Ripon was 228 cfs.
 During the January 21 survey, 26 Chinook salmon were captured at Oakdale (RM 40) and 6 at Riverbank (RM 33). Forklengths ranged from 33 to 37 mm (avg: 35.7 mm). No salmon were captured downstream of Riverbank. Average daily flow at Ripon was 218 cfs. During the surveys, a white sturgeon was observed swimming in shallow waters around the Highway 99 Bridge (Figure 4).
Figure 4. White sturgeon viewed from above.
The rotary screw trap at Oakdale (RM 40) sampled continuously between January 19 and February 1. A total of 23,241 juvenile Chinook salmon were captured during the reporting period increasing the season total to 29,275. Daily catch ranged between 52 and 12,355 Chinook (Figure 6). Average forklengths and weights of Chinook salmon are provided in Table 2 for 827 fish that were measured. Most of the measured Chinook were fry (n=783) but parr (n=33) and smolts (n=11) were also observed.
 Five Age 1+ (100-299 mm) O. mykiss smolts were captured during this reporting period (Table 2 and Figure 5).
Figure 5. O. mykiss in a viewing box.
Instantaneous temperature recorded at the trap ranged from 46�F to 53�F, and turbidity ranged from 0.2 NTU to 2.2 NTU. Daily average flow at Goodwin Dam (GDW) fluctuated between 169 cfs and 194 cfs, and flows at Ripon (RIP) fluctuated between 215 cfs and 257 cfs.
Two trap efficiency experiments were conducted on January 21 and January 29 using 258 and 287 naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). A total of 107 marked Chinook were recaptured during the first release and 141 during the second release, yielding preliminary capture efficiency estimates of 41.5% and 49.6%, respectively, at a flow of 176 cfs (Table 3).
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between January 19 and February 1, 2009. Parentheses indicate range.
Table 3. Trap efficiency tests conducted at Oakdale between January 19 and February 1, 2009.
Figure 6. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded by Goodwin Dam (GDW) and Ripon (RIP), 2009. Note: Daily catch peaked at 12,355 Chinook on January 26, 2009.
Rotary screw trap monitoring at Caswell State Park (RM 8) continued during the reporting period, but data is not yet available.
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2009 Tuolumne River Juvenile Migration Monitoring
The second TID seining survey was conducted January 27 on the Tuolumne and San Joaquin rivers. A total of 39 juvenile Chinook salmon were captured in the Tuolumne River downstream to TRR (RM 42.3) and none were captured in the San Joaquin River.
Survey results are available at www.tuolumnerivertac.com/data.htm.
The rotary screw trap at Waterford (RM 30) operated continuously between January 19 and February 1. A total of 368 juvenile Chinook salmon were captured during the reporting period increasing the season total to 376. Daily catch ranged between one and 73 Chinook (Figure 7) and size ranged from 33-114 mm. Average forklengths and weights of Chinook salmon are provided in Table 4. Most of the measured Chinook were fry (n=359), but five smolts were measured as well.
No O. mykiss were captured during this reporting period.
Instantaneous temperature recorded at the trap ranged from 49.4�F to 55.0�F, and turbidity ranged from 0.6 NTU to 2.8 NTU. Daily average flow at La Grange (LGN) was relatively stable ranging between 164 cfs and 167 cfs.
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between January 19 and February 1, 2009. Parentheses indicate range.
Four trap efficiency experiments were conducted during the reporting period using between 37 and 70 naturally spawned juvenile Chinook salmon marked caudal fin orange (CFO). Between 2 and 7 marked Chinook were recaptured subsequently after release, yielding preliminary capture efficiency estimates between 4.8% and 18.9% (Table 5).
Table 5. Trap efficiency tests conducted at Waterford between January 19 and February 1, 2009.
Figure 7. 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 January 19 and February 1. No salmonids were captured and no trap efficiency experiments could be conducted during this reporting period.
Instantaneous temperature recorded at the trap ranged from 49.2�F to 55.2�F, and turbidity ranged from 0.5 NTU to 62.0 NTU. Daily average flow at Modesto (MOD) fluctuated during this reporting period ranging between 219 cfs and 288 cfs.
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San Joaquin River Conditions
During the reporting period, flows in the San Joaquin River at Vernalis ranged between 1,034 cfs and 1,433 cfs (Figure 8). Average daily water temperatures in the San Joaquin River ranged between 49.5�F and 50.8�F at Vernalis, between 49.7�F and 54.1�F at Mossdale; and between 48.9�F and 51.2�F at Rough 'n Ready Island (Figure 9). Average daily dissolved oxygen (DO) in the San Joaquin River ranged between 10.7 mg/L and 11.6 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 8.8 mg/L and 10.1 mg/L at Mossdale (Figure 10).
Figure 8. San Joaquin River flow at Vernalis, 2008/09.
Figure 9. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, 2008/09.
Figure 10. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, 2008/09. |
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 994 cfs and 2,674 cfs (Figure 11). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 1,017 cfs and 2,601 cfs. Combined total exports (state and federal pumps) ranged between 2,012 cfs and 5,195 cfs.
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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