Volume 2010, Issue 13
| May 6, 2010 |
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2010 VAMP Period:
April 23 - May 23
ASLO & NABS Meeting:
June 6-11
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Photo by FISHBIO.
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Key Highlights
Calaveras River Juvenile Migration Monitoring. A total of 1,276 O. mykiss were captured at Shelton Road (RM 28) increasing the season total to 2,100.
Mokelumne River Juvenile Migration Monitoring. A total of 97 Chinook salmon were captured at Vino Farms (RM 54) increasing the season total to 8,264 and 76 Chinook salmon were captured at Golf (RM 38) increasing the season total to 139. During the reporting period, the Woodbridge bypass trap (RM 38) began sampling. 69 Chinook salmon have been captured so far this season.
San Joaquin River Juvenile Migration Monitoring. A total of 113 juvenile Chinook salmon were captured at Mossdale during the reporting period, increasing the season total to 159.
Stanislaus River Juvenile Migration Monitoring. On April 15 and April 28 seining surveys were conducted at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. On April 28 Chinook salmon were captured at Jacob Meyers (RM 33).
A total of 1,218 Chinook salmon were captured in the Oakdale rotary screw trap (RM 40) increasing the season total to 35,792.
At Caswell State Park (RM 8), data is not yet available for the reporting period.
Tuolumne River Juvenile Migration Monitoring. A total of 164 Chinook salmon were captured at Waterford (RM 30) increasing the season total to 1,582. Five Chinook salmon were captured at Grayson (RM 5) increasing the season total to 25.
Weir Monitoring. No Chinook salmon were detected at the Stanislaus or Tuolumne River Weirs.
San Joaquin River Conditions. San Joaquin River flows at Vernalis ranged from 3,874 cfs to 5,635 cfs. Water temperatures in the San Joaquin River ranged between 56.3�F and 63.4�F and average daily dissolved oxygen (DO) ranged between 8.8 mg/L and 9.5 mg/L.
Delta Exports. Combined total exports (state and federal pumps) were stable during the reporting period ranging from 1,409 cfs and 1,526 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 twelve days between April 12 and May 2. A total of 1,276 O. mykiss were captured, increasing the season total to 2,100. Daily catch ranged between 4 and 360 O. mykiss with peak catch periods associated with run-off events (Figure 1). Most of the O. mykiss captured, (n=414) were YOY (<100 mm) and were rated as fry (n=45), parr (n=366), silvery parr (n=2) and smolt (n=1). Seventeen Age 1+ (100-299 mm) were also captured and were all rated as parr (n=1), silvery parr (n=8) and smolt (n=8). Average forklengths and weights are provided in Table 1 for 431 of O. mykiss measured.
No Chinook salmon have been captured this season.
Instantaneous temperatures recorded at the trap ranged from 53�F to 63�F (Figure 2), and turbidity ranged from 0.13 NTU to 8.70 NTU. Daily average flow fluctuated between 18 cfs and 34 cfs at New Hogan Dam (NHG), between 4 cfs and 85 cfs at Cosgrove Creek (COS), and between 4 cfs and 108 cfs at Bellota (MRS).
Table 1. Biosampling data for O. mykiss captured and measured at Shelton Road between April 12 and May 2, 2010. Parentheses indicate range.
Figure 1. 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, 2009 and May 2, 2010.
Figure 2. Daily O. mykiss catch at Shelton Road and Calaveras River temperature recorded instantaneously at trap location between November 1, 2009 and May 2, 2010 |
2009/10 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued to sample intermittently between April 12 and May 2 and a total of 97 Chinook salmon were captured increasing the season total to 8,264. Average daily flows from Camanche Reservoir (CMN) increased from 405 cfs to 1,453 cfs (Figure 3). Instantaneous temperature ranged between 52.0�F and 54.5�F and instantaneous turbidity ranged between 1.59 NTU and 5.23 NTU.
Nine O. mykiss were captured at Vino Farms during the report period increasing the season total to 45.
Figure 3. Daily Chinook catches at Vino Farms and Mokelumne River flow recorded by Camanche Reservoir (CMN), between December 1, 2009 and May 2, 2010.
The Mokelumne River rotary screw trap at Golf (RM 38) continued to sample intermittently between April 12 and May 2 and a total of 76 Chinook salmon were captured increasing the season total to 139 (Figure 4).
Average daily flows recorded at Woodbridge (WBR) increased from 264 cfs to 1,118 cfs. Instantaneous temperature ranged between 54.5�F and 61.0�F and instantaneous turbidity ranged between 1.85 NTU and 4.33 NTU.
48 O. mykiss were captured at Golf during this reporting period increasing the season total to 694 (Note: 46 of the O. mykiss had clipped adipose fins suggesting hatchery origin).
Figure 4. Daily Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge (WBR), between December 1, 2009 and May 2, 2010.
The Woodbrige bypass trap (RM 38) began sampling during the reporting period. 69 Chinook salmon have been captured so far this season (Figure 5).
Average daily flows recorded at Woodbridge (WBR) increased from 264 cfs to 1,118 cfs. Instantaneous temperature ranged between 54.7�F and 61.7�F and instantaneous turbidity ranged between 1.84 NTU and 3.52 NTU.
84 O. mykiss were captured at Bypass during this reporting period (Note: 76 of the O. mykiss had clipped adipose fins indicating hatchery origin).
Figure 5. Daily Chinook catches at Bypass and Mokelumne River flow recorded at Woodbridge (WBR), between April 14 and May 2, 2010.
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San Joaquin River Juvenile Migration Monitoring
California Department of Fish and Game conducted fifteen days (ten tows per day) of Kodiak Trawling (Mossdale Trawl) on the San Joaquin River near Mossdale between April 12 and May 2. A total of 113 juvenile Chinook salmon were captured. Catch ranged between one and 41 Chinook per ten tows (Figure 6).
Figure 6. Chinook salmon catch (per ten tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2010. |
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2010 Stanislaus River Juvenile Migration Monitoring
The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuouslyFigure 7. Stanislaus River rotary screw trap at Oakdale.  | between April 12 and May 2 (Figure 7). A total of 1,218 juvenile Chinook salmon were captured during the reporting period increasing the season total to 35,792. Daily catch ranged between 3 and 174 Chinook salmon. Average forklengths and weights of Chinook salmon are provided in Table 2 for 883 fish that were measured. Most of the measured Chinook were smolts (n=685), but there were also fry (n=1) and parr (n=72).
No O. mykiss were captured at Oakdale during the reporting period. Nine O. mykiss have been captured so far this season.
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between March 29 and May 2, 2010.
Instantaneous temperature recorded at the trap ranged from 50.5�F to 53.9�F, and turbidity ranged from 0.18 NTU to 14.40 NTU. Daily average flow was stable during the reporting period between 999 cfs and 1,022 cfs at Goodwin Dam (GDW) and 970 cfs to 1,120 cfs at Ripon (RIP) (Figure 8).
No trap efficiency experiments were conducted during the reporting period due to insufficient daily catch.
Figure 8. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP), 2010.
Data is not yet available for the Stanislaus River rotary screw trap at Caswell State Park (RM 8) during the reporting period.
Stanislaus River seining surveys were conducted on April 15 and April 28 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. A total of 2 Chinook salmon were captured at Jacob Meyer (RM 33). Forklengths were 80 mm and 87 mm (avg: 84 mm). Average daily flow at Ripon was 1,025 cfs. |
2010 Tuolumne River Juvenile Migration Monitoring
Figure 9. Tuolumne River rotary screw trap at Waterford.  | The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously between April 12 and May 2 (Figure 9). A total of 164 juvenile Chinook salmon were captured during the reporting period increasing the season total to 1,582. Daily catch ranged between one and fourteen Chinook salmon. Average forklengths and weights of Chinook salmon are provided in Table 3 for 152 fish that were measured. Most of the measured fish were smolts (n=143), but there were also fry (n=9).
No O. mykiss have been captured so far this season.
Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between March 29 and May 2, 2010. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 50.1�F to 54.2�F, and turbidity ranged from 0.55 NTU to 5.37 NTU. Daily average flow records from La Grange (LGN) increased from 1,080 cfs to 2,350 cfs (Figure 10).
Due to insufficient daily catch, no trap efficiency experiments were conducted during the reporting period.
Figure 10. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2010.
The Tuolumne River rotary screw traps at Grayson (RM 5) sampled continuously between April 12 and May 2. Five Chinook salmon were captured during the reportingFigure 11. Tuolumne River rotary screw trap at Grayson.  | period increasing the season total to 25 (Figure 11).
No O. mykiss have been captured yet this season.
Trap efficiency releases have not yet been conducted this season due to insufficient daily catch.
Instantaneous temperature taken at the trap ranged from 51.0�F to 59.1�F, and turbidity ranged from 1.95 NTU to 6.11 NTU. Daily average flow at Modesto (MOD) increased from 820 cfs to 1,930 cfs between April 12 and April 21, and data has not been available since April 21 (Figure 12).
Figure 12. Daily Chinook salmon catch at Grayson and Tuolumne River flow at La Grange (LGN) and Modesto (MOD), 2010.
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2009/10 Stanislaus River Weir Monitoring
Between April 12 and May 2 no Chinook salmon were detected passing upstream of the Stanislaus River Weir. Season total remains at 1,281.
No O. mykiss (170 mm) were detected passing upstream during this reporting period. Nine O. mykiss have been detected so far this season.
Several non-salmonid species were observed with passage dominated by Sacramento sucker and Sacramento pikeminnow (Table 4).
. Table 4. Net passage counts for all species between April 12 and May 2, 2010 at the Stanislaus River Weir.
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2009/10 Tuolumne River Weir Monitoring
Figure 13. Tuolumne Weir at high flows.  | Between April 12 and April 16 no Chinook salmon were detected passing upstream of the Tuolumne River Weir. Season total remains at 301. On April 16 flow exceeded the effective operational capacity of the weir (i.e. >1,500 cfs), thus monitoring has been suspended until further notice (Figure 13).
No O. mykiss were detected during this reporting period. Season total remains at one |
Between April 12 and May 2, flows in the San Joaquin River at Vernalis ranged from 3,874 cfs to 5,635 cfs (Figure 14). Water temperatures in the San Joaquin River fluctuated between 56.3�F and 63.4�F at Vernalis; between 57.3�F and 64.2�F at Mossdale; and between 60.0�F and 64.9�F at Rough 'n Ready Island (Figure 15). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated between 7.4 mg/L and 8.7 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and fluctuated between 8.8 mg/L and 9.5 mg/L at Mossdale (Figure 16).
Figure 14. San Joaquin River flow at Vernalis, May 1, 2009 through May 2, 2010.
Figure 15. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, May 1, 2009 through May 2, 2010.
Figure 16. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, May 1, 2009 through May 2, 2010.
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Delta Exports
Combined total exports (state and federal pumps) were stable during the reporting period ranging from 1,409 cfs to 1,526 cfs. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 638 cfs to 833 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 618 cfs to 862 cfs during the reporting period (Figure 17).
Figure 17. Daily exports at the federal and state pumping stations, May 1, 2009 through May 2, 2010.
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