Volume 2010, Issue 15
| June 11, 2010 |
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Delta Stewardship Council Meeting:
June 24-25
Bay Planning Coalition Dredging Workshop:
June 29
Water Education Foundation Delta Tour:
July 14-18
Delta Science Conference: Sept. 27-29 |
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Photo by FISHBIO.
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Key Highlights
Calaveras
River Juvenile Migration Monitoring. A total of 141 O. mykiss were captured at Shelton Road (RM 28), increasing the
season total to 2,723.
Mokelumne
River Juvenile Migration Monitoring. A total of 50
Chinook salmon were captured at Vino Farms (RM 54), increasing the season total
to 8,386. 177 Chinook salmon were captured at Golf (RM 38), increasing the
season total to 380, and 113 Chinook salmon were captured at Woodbridge (RM 38),
increasing the season total to 227.
San Joaquin River
Juvenile Migration Monitoring. A total of 88 juvenile Chinook salmon were captured at Mossdale during
the reporting period, increasing the season total to 289.
Stanislaus
River Juvenile Migration Monitoring. Stanislaus River
seining surveys were concluded for the season on May 14. During the ten days
of surveys 285 Chinook salmon were captured at various locations between
Oakdale (RM 40) and the confluence with the San Joaquin River.
A
total of 209 Chinook salmon were captured in the Oakdale rotary screw trap (RM
40), increasing the season total to 36,465.
A
total of 116 Chinook salmon were captured at the Caswell State Park rotary
screw trap (RM 8), increasing the season total to 1,104.
Tuolumne
River Juvenile Migration Monitoring. A total of 360
Chinook salmon were captured at Waterford (RM 30), increasing the season total
to 2,239. Twenty Chinook salmon were captured at Grayson (RM 5), increasing the
season total to 48.
Weir
Monitoring. Seven Chinook salmon were detected as they passed upstream
of the Stanislaus River Weir.
San Joaquin River
Conditions. San Joaquin River flows at Vernalis
ranged from 3,760 cfs to 5,068 cfs. Water temperatures in the San Joaquin River
ranged between 58.9�F and
68.7�F and average daily
dissolved oxygen (DO) ranged between 8.9 mg/L and 9.7 mg/L.
Delta Exports. Combined
total exports (state and federal pumps) increased during the reporting
period ranging from 823 cfs to 7,306 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 May 17 and June 6. A total of 141 O. mykiss were captured, increasing the
season total to 2,723. Daily catch ranged between 2 and 20 O. mykiss (Figure 1). Most of the O. mykiss captured, (n=135) were YOY (<100 mm) and were rated as
fry (n=2), parr (n=125), and silvery parr (n=4). Five Age 1+ (100-299 mm) fish
were captured and rated as silvery parr (n=4) and smolt (n=1). Average
forklengths and weights are provided in Table 1 for 140 of O. mykiss measured.
No Chinook salmon have been captured this
season.
Instantaneous
temperatures recorded at the trap ranged from 57�F to 62�F (Figure 2), and
turbidity ranged from 0.07 NTU to 1.00 NTU. Daily average flow fluctuated
between 76 cfs and 188 cfs at New Hogan Dam (NHG), between 0 cfs and 17 cfs at
Cosgrove Creek (COS), and between 24 cfs and 42 cfs at Bellota (MRS).
Table 1.
Biosampling data for O. mykiss captured
and measured at Shelton Road between May 17 and June 6, 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 June
6, 2010.
Figure 2. Daily O. mykiss catch at Shelton Road and Calaveras River temperature
recorded instantaneously at trap location between November 1, 2009 and June 6,
2010.
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2009/10 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued to sample
intermittently between May 17 and June 6 and a total of 50 Chinook salmon were
captured, increasing the season total to 8,386.
Average
daily flows from Camanche Reservoir (CMN) fluctuated between 799 cfs and 1,397
cfs (Figure 3). Instantaneous temperature ranged between 54.3�F and 56.8�F and instantaneous turbidity ranged between
1.43 NTU and 4.90 NTU.
Three O. mykiss were captured
at Vino Farms during the report period increasing the season total to 50.
Figure 3. Daily Chinook catches at Vino
Farms and Mokelumne River flow recorded by Camanche Reservoir (CMN), between
December 1, 2009 and June 6, 2010. The Mokelumne River rotary
screw trap at Golf (RM 38) continued to sample intermittently between May 17 and
June 6. A total of 177 Chinook salmon were captured
increasing the season total to 380 (Figure 4). Average daily flow
recorded at Woodbridge (WBR) fluctuated between 587 cfs and 1,118 cfs. Instantaneous temperature ranged between 56.3�F and 60.1�F and
instantaneous turbidity ranged between 2.01 NTU and 3.36 NTU. Ten O. mykiss were captured at
Golf during this reporting period, increasing the season total to 707 (Note:
One of the O. mykiss had clipped
adipose fins indicating hatchery origin).
Figure 4. Daily Chinook catches at Golf and Mokelumne
River flow recorded at Woodbridge (WBR), between December 1, 2009 and June 6,
2010. The Mokelumne River bypass trap at Woodbridge (RM 38) continued
sampling during the reporting period. One hundred and thirteen Chinook salmon
were captured during the reporting period
increasing the season total to 227 (Figure 5). Average daily flows
recorded at Woodbridge (WBR) fluctuated between 587 cfs and 1,118 cfs. Instantaneous temperature ranged between 56.3�F and 60.4�F and
instantaneous turbidity ranged between 1.91 NTU and 3.03 NTU. Twenty-two O. mykiss were
captured at Woodbridge during this reporting period increasing the season total to
114 (Note: Two of the O. mykiss had
clipped adipose fins suggesting hatchery origin).
Figure 5. Daily Chinook catches at Woodbridge and
Mokelumne River flow recorded at Woodbridge (WBR), between April 14 and June 6,
2010.
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San Joaquin River Juvenile Migration Monitoring
California Department of Fish and Game conducted ten days (ten tows per
day) of Kodiak Trawling (Mossdale Trawl) on the San Joaquin River near Mossdale between May 17
and May 30. A total of 88 juvenile Chinook salmon were captured, and catch
ranged between 0 and 22 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) started sampling Figure 7. O. mykiss observed in the Stanislaus River during snorkel survey.  | intermittently during the reporting period and
sampled thirteen days between May 17 and June 6. A total of 209 juvenile
Chinook salmon were captured during the reportingperiod, increasing the season
total to 36,465. Daily catch ranged between zero and fifty-three Chinook salmon.
Average
forklengths and weights of Chinook salmon are provided in Table 2 for 196 fish
that were measured. All of the measured Chinook were smolts (n=171), including 12
larger fish (i.e., > 100 mm).
Five O. mykiss were captured at Oakdale
during the reporting period, increasing the season total to 14 O. mykiss (Figure 7).
Table
2. Biosampling data for Chinook salmon and O.
mykiss captured and measured at Oakdale between May 17 and June 6, 2010.
Instantaneous temperature recorded
at the trap ranged from 54.1�F to 64.2�F, and turbidity ranged from 0.29 NTU to
1.08 NTU. Daily average flow during the reporting period decreased from 824 cfs
to 202 cfs at Goodwin Dam (GDW) and 924 cfs to 295 cfs at Ripon (RIP) (Figure
8).
One trap efficiency
experiment was conducted with naturally spawned juvenile Chinook salmon marked
caudal fin green (CFG). Preliminary capture efficiency estimate from the
release was 4.3% at flows of 209 cfs (Table 3).
Table
3. Trap efficiency experiments conducted at Oakdale between May 17 and June 6,
2010.
Figure 8. Daily Chinook
salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW)
and Ripon (RIP), 2010.
The
Stanislaus River rotary screw trap at Caswell State Park (RM 8) sampled intermittently
between May 17 and June 6. A total of 116 juvenile Chinook
salmon were captured during the reporting period increasing the season total to
1,104. Daily catch ranged between zero and 16 Chinook salmon.
No O. mykiss
were captured during the sampling period. Season total remains at one.
No trap efficiency
experiments were conducted due to insufficient daily catch.
Instantaneous temperature
recorded at the trap ranged from 57.0�F and 72.5�F, and turbidity ranged from 1.86
NTU to 5.37 NTU. Daily average flow at Ripon (RIP) decreased from 924 cfs and 295
cfs.
Stanislaus River seining surveys were concluded
for the season on May 14. During the ten days of surveys 285 Chinook salmon
were captured at various locations between Oakdale (RM 40) and the confluence
with the San Joaquin River (Table 4).
Table
4. Biosampling data for
Chinook salmon captured on the Stanislaus River between Oakdale (RM 40) and the
confluence of the San Joaquin River, 2010.
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2010 Tuolumne River Juvenile Migration Monitoring
The Tuolumne River rotary screw trap at Waterford (RM 30) operated
continuously between May 17 and June 6. A total of 360 juvenile Chinook salmon
were captured during the reporting period increasing the season total to 2,239.
Daily catch ranged between zero and fifty Chinook salmon. Average
forklengths and weights of Chinook salmon are provided in Table 5 for 358 fish
that were measured. Most of the measured fish were smolt (n=356) but a fry
(n=1) and a parr (n=1) were also observed.
No O. mykiss have been captured so far this
season.
Table
5. Biosampling data for Chinook salmon captured and measured at Waterford
between May 17 and June 6, 2010. Parentheses indicate range.
Instantaneous temperature
taken at the trap ranged from 51.0�F to 56.3�F, and turbidity ranged from 0.08
NTU to 2.05 NTU. Daily average flow records from La Grange (LGN) ranged from
2,030 cfs to 3,260 cfs (Figure 9).
Due to insufficient daily
catch, no trap efficiency experiments were conducted during the reporting
period.
Figure 9. 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
May 17 and June 6. Twenty Chinook salmon were captured during the Figure 10. Chinook salmon captured at the Tuolumne River rotary screw trap at Grayson.  | reporting
period increasing the season total to 48 (Figure 10; Table 6).
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 51.8�F to 58.3�F, and turbidity
ranged from 0.69 NTU to 9.29 NTU. Daily average flow at Modesto (MOD) has not
been available since April 21 (Figure 11).
Table 6. Biosampling data
for Chinook salmon captured and measured at Grayson between May 17 and June 6,
2010. Parentheses indicate range.
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2009/10 Stanislaus River Weir Monitoring
Between
May 17 and June 6 seven Chinook salmon were detected passing upstream of the Stanislaus River Weir, increasing the
season total to 1,288.
One
O. mykiss (170 mm) was detected
passing upstream during this reporting period, increasing the season total to
ten O. mykiss (Table 7).
Table
7. Net passage counts for all species between May 17 and June 6, 2010 at the
Stanislaus River Weir.
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Between May 17 and June 6 flows in the San Joaquin
River at Vernalis ranged from 3,760 cfs to 5,068 cfs (Figure 12). Water
temperatures in the San Joaquin River fluctuated between 58.9�F and 68.7�F at Vernalis; between 60.0�F and 71.0�F at Mossdale; and between 62.6�F and 73.1�F at Rough 'n Ready Island (Figure 13). Average daily dissolved oxygen
(DO) in the San Joaquin River fluctuated between 7.3 mg/L and 8.6 mg/L in the
deep water ship channel (measured at Rough 'n Ready Island) and fluctuated
between 8.9 mg/L and 9.7 mg/L at Mossdale (Figure 14).
Figure
12. San Joaquin River flow at Vernalis, June 1, 2009 through June 6, 2010.
Figure
13. San Joaquin River daily average water temperature at Vernalis, Mossdale,
and Rough 'n Ready, June 1, 2009 through June 6, 2010.
Figure
14. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n
Ready, June 1, 2009 through June 6, 2010.
Water temperature in the San Joaquin River generally
increased between January and June. Comparatively, water temperature during
this time period was similar (2007 to 2010); however, it
appears that some fluctuation occurred during the months of April and May (Figure
15).
 
Figure
15. San Joaquin River daily average water temperature at Rough n' Ready Island,
Mossdale, and Vernalis, January through June, (2007-2010).
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Delta Exports
Combined total exports (state and federal pumps) increased during the reporting period ranging from 823 cfs to 7,306
cfs. Mean daily
pumping at the Harvey O. Banks Pumping Plant (state pumps) increased from 0 cfs
to 4,273 cfs. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps
previously known as Tracy Pumping Plant) increased from 789 cfs to 3,515 cfs
during the reporting period (Figure 16).
Figure
16. Daily exports at the Federal and State pumping stations, June 1, 2009
through June 6, 2010.
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