Volume 2009/10, Issue 6
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January 19, 2010 | |
Jan 19-20: DWR/HTI Hydroacoustic Workshop
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Photo by FISHBIO.
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Key Highlights
2009/10 Calaveras River Migration Monitoring continued during the reporting period and a total of 111 O. mykiss were captured increasing the season total to 145.
2009/10 Mokelumne River Juvenile Migration Monitoring was initiated during the reporting period. Rotary Screw Traps were installed at RM 54 and RM 38 on November 30 and December 10, respectively. 33 Chinook salmon have been captured at RM 54 and no Chinook salmon have been captured at RM 38 thus far.
2009/10 Stanislaus River Weir Monitoring continued during the reporting period. A total of 48 fall-run Chinook salmon were detected as they passed upstream of the Stanislaus River Weir increasing the season total to 1,248.
2009/10 Tuolumne River Weir Monitoring continued during the reporting period. A total of 49 Chinook salmon were detected as they passed upstream of the Tuolumne River Weir increasing the season total to 269.
2009 San Joaquin Basin Escapement Surveys. Annual carcass surveys conducted by CDFG were concluded during the reporting period.
San Joaquin River Conditions. San Joaquin River flows at Vernalis remained relatively stable ranging between 1,244 cfs and 1,456 cfs. Water temperatures in the San Joaquin River ranged between 44.4�F and 52.4�F and average daily dissolved oxygen (DO) remained stable ranging between 9.2 mg/L and 9.5 mg/L.
Delta Exports. Combined total exports (state and federal pumps) increased during the reporting period ranging between 3,934 cfs and 7,788 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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2009/10 Calaveras River Juvenile Migration Monitoring
 The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled 14 days between December 7, 2009 and January 3, 2010 (Figure 1). A total of 111 O. mykiss were captured during the reporting period increasing the season total to 145 which is similar to 2008 (Table 2). Daily catch ranged between two and 29 O. mykiss (Figure 2). All 111 O. mykiss that were captured were Age 1+ (100-299 mm) and were rated as parr (n=8), silvery parr (n=96), and smolt (n=7). Average forklengths and weights of O. mykiss are provided in Table 1.
No Chinook salmon were captured during this reporting period.
Instantaneous temperatures recorded at the trap ranged from 40.0�F to 49.5�F (Figure 3), and turbidity ranged from 0.07 NTU to 1.56 NTU. Daily average flow fluctuated between 29 cfs and 61 cfs at New Hogan Dam (NHG), between 0 cfs and 6 cfs at Bellota (MRS), and between 0 cfs and 13 cfs at Cosgrove Creek (COS).
Table 1. Biosampling data for O. mykiss captured at Shelton Road between December 7 and January 3, 2010. Parentheses indicate range.
Figure 2. Daily O. mykiss catch at Shelton Road and Calaveras River flow recorded by New Hogan Dam (NHG) and Cosgrove Creek (COS) combined, between November 1 and January 3, 2010.
Figure 3. Daily O. mykiss catch at Shelton Road and Calaveras River temperature recorded instantaneously at trap location between November 1, 2009 and January 3, 2010.
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2009/10 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw traps at Vino Farms (RM 54) and at Golf (RM 38) were installed on November 30 and December 10, respectively. Intermittent monitoring began shortly after installation.
Thus far, 33 Chinook salmon have been captured at Vino Farms and no Chinook salmon have been captured at Golf. |
2009/10 Stanislaus River Weir Monitoring
Between December 7, 2009 and January 3, 2010 a total of 48 fall-run Chinook salmon were detected as they passed upstream of the Stanislaus River Weir increasing the season total to 1,248. Daily passage ranged between zero and 10 Chinook salmon. In comparison to previous years, returns to the Stanislaus River during 2009 represent a three-fold increase over the low of 408 salmon observed during 2007 (Table 2; Figure 4).
Zero O. mykiss were detected passing the weir during the reporting period. Net upstream count remains at five O. mykiss this season.
Table 2. Annual Fall-run Chinook passage prior to January 3, 2003-2009.
Figure 4. Cumulative Chinook salmon upstream passage recorded at the Stanislaus River Weir, 2003 to 2009.
Daily average flow in the Stanislaus River at Goodwin Dam (GDW; RM 58) slightly decreased during the reporting period ranging between 202 cfs and 280 cfs. Flows at Ripon (RIP; RM 15) ranged between 215 cfs and 268 cfs (Figure 5). Note: flows downstream of Goodwin Dam may be higher than dam releases due to irrigation returns and other factors.
Instantaneous water temperatures measured at the weir fluctuated during the reporting period ranging between 44.6˚F and 51.6˚F and daily average water temperatures at Ripon (RPN; RM 15) ranged between 44.9˚F and 52.8˚F (Figure 6). Instantaneous turbidity ranged between 0.25 NTU and 1.99 NTU (Figure 7). Instantaneous dissolved oxygen ranged between 10.58 mg/L and 13.76 mg/L and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged between 10.4 mg/L and 11.9 mg/L (Figure 8).
Figure 5. Daily upstream Chinook passage recorded at the Stanislaus River Weir in relation to instantaneous water temperature recorded at the weir and daily average water temperature recorded in the Stanislaus River at Ripon (RPN) and in the San Joaquin River at Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI), 2009.
Figure 6. Daily upstream Chinook passage recorded at the Stanislaus River Weir in relation to instantaneous turbidity recorded at the weir, 2009.
Figure 7. Daily upstream Chinook passage recorded at the Stanislaus River Weir in relation to instantaneous dissolved oxygen recorded at the weir and daily average dissolved oxygen recorded in the Stanislaus River at Ripon (RPN) and in the San Joaquin River at Mossdale (MSD) and Rough & Ready (RRI), 2009.
Figure 8. Daily upstream Chinook passage recorded at the Stanislaus River Weir in relation to daily average flows (cfs) recorded in the Stanislaus River at Goodwin (GDW) and Ripon (RIP) and in the San Joaquin River at Vernalis (VNS), 2009.
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2009/10 Tuolumne River Weir Monitoring
Between December 7, 2009 and January 3, 2010 a total of 36 Chinook salmon were detected as they passed upstream of the Tuolumne River Weir increasing the season total to 269. Daily passage ranged between zero and eight Chinook.
Daily average flow in the Tuolumne River at La Grange (LGN; RM 51.8) was stable between 252 cfs and 257 cfs. Flow at Modesto (MOD; RM 17) was stable between 309 cfs and 348 cfs (Figure 9). Note: flows at Modesto may be higher than La Grange due to accretion and Dry Creek inflow. Instantaneous water temperatures measured at the weir ranged between 47.3˚F and 52.5˚F and daily average water temperatures at Modesto (MOD; RM 17) ranged between 46.2˚F and 52.8˚F (Figure 10). Instantaneous turbidity ranged between 0.18 NTU and 1.27 NTU (Figure 11), and instantaneous dissolved oxygen ranged between 9.08 mg/L and 12.81 mg/L (Figure 12).
Figure 9. Daily upstream Chinook passage recorded at the Tuolumne River Weir in relation to instantaneous water temperature recorded at the weir and daily average water temperature recorded in the Tuolumne River at Modesto (MOD) and in the San Joaquin River at Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI), 2009.
Figure 10. Daily upstream Chinook passage recorded at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir, 2009.
Figure 11. Daily upstream Chinook passage recorded at the Tuolumne River Weir in relation to instantaneous dissolved oxygen recorded at the weir and daily average dissolved oxygen recorded in the San Joaquin River at Mossdale (MSD) and Rough & Ready (RRI), 2009.
Figure 12. Daily upstream Chinook passage recorded at the Tuolumne River Weir in relation to daily average flows (cfs) recorded in the Tuolumne River at La Grange (LGN) and Modesto (MOD) and in the San Joaquin River at Vernalis (VNS), 2009.
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2009 San Joaquin Basin Escapement Surveys
Annual carcass surveys conducted by CDFG were concluded during the reporting period and data have been reported through the week of December 14. Similar to 2008, the numbers observed on all tributaries were low with live counts of 27 Chinook on the Stanislaus, 12 on the Tuolumne, and 31 on the Merced Rivers during the week of December 14. During the same week redd counts of 50 on the Stanislaus, 36 on the Tuolumne, and 45 on the Merced Rivers were recorded.
Three female salmon were spawned at the Merced River Fish Facility (MRFF) during the week of December 14 for a total of 42 this season. |
Between December 7, 2009 and January 3, 2010, flows in the San Joaquin River at Vernalis remained relatively stable ranging between 1,229 cfs and 1,456 cfs (Figure 13). Water temperatures in the San Joaquin River ranged between 44.4�F and 52.4�F at Vernalis; between 44.7�F and 52.8�F at Mossdale; and between 49.6�F and 51.2�F at Rough 'n Ready Island (Figure 14). Average daily dissolved oxygen (DO) in the San Joaquin River ranged between 9.2 mg/L and 9.5 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and fluctuated between 9.6 mg/L and 11.0 mg/L at Mossdale (Figure 15).
Figure 13. San Joaquin River flow at Vernalis, January 1, 2009 through January 3, 2010.
Figure 14. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, January 1, 2009 through January 3, 2010.
Figure 15. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, January 1, 2009 through January 3, 2010. |
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Delta Exports
Combined total exports (state and federal pumps) fluctuated during the reporting period ranging between 3,934 cfs and 7,788 cfs. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) fluctuated between 1,961 cfs and 5,095 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) fluctuated between 1,007 cfs and 2,935 cfs during the reporting period (Figure 16).
Figure 16. Daily exports at the C.W. Jones Pumping Plant (federal) and Harvey O. Banks Pumping Plant (state), January 1, 2009 through January 3, 2010.
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