Volume 2008/09, Issue 12
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May 6, 2009 | |
May 28: SJRRP Fishery Management Group Meeting
June 11: Tuolumne River Technical Advisory Committee
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Key Highlights
2008/09 Calaveras River Juvenile Migration Monitoring. The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled eight days between April 13 and April 26. A total of 100 O. mykiss were captured during the reporting period, increasing the season total to 765.
2009 San Joaquin River Juvenile Migration Monitoring. A total of 127 juvenile Chinook salmon were captured at Mossdale during the reporting period, increasing the season total to 245.
2009 Stanislaus River Juvenile Migration Monitoring. Stanislaus River seining surveys were conducted on March 14 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River.
The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between April 13 and April 26. A total of 335 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 59,325.
The rotary screw trap at Caswell State Park (RM 8) sampled continuously between April 13 and April 26. A total of 15 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 602.
2009 Tuolumne River Juvenile Migration Monitoring. The eighth TID seining survey was conducted April 21 on the Tuolumne and San Joaquin rivers. A total of 14 juvenile Chinook salmon were captured in the Tuolumne River between Riffle 5 (RM 48.0) and Hickman Bridge (RM 31.6) and none were captured in the San Joaquin River.
The rotary screw traps at Waterford (RM 30) and Grayson (RM 5) sampled continuously between April 13 and April 26. A total of 186 juvenile Chinook salmon were captured at Waterford during the reporting period, increasing the season total to 2,795. A total of seven juvenile Chinook salmon were captured at Grayson during the reporting period, increasing the season total to 14.
2009 Merced River Juvenile Migration Monitoring. The rotary screw trap at Hatfield State Park (RM 2) sampled 12 days between April 13 and April 26. The first juvenile Chinook salmon smolt (103 mm) of the season was captured during the reporting period.
San Joaquin River Conditions. Flow in the San Joaquin River at Vernalis exhibited an overall increasing trend ranging between 1,378 cfs and 2,042 cfs. Average daily water temperature in the San Joaquin River recorded at Vernalis, Mossdale, and Rough n' Ready Island ranged between 58.2�F and 68.5�F. Average daily dissolved oxygen in the San Joaquin River recorded at Mossdale and Rough n' Ready Island ranged between 6.6 mg/L and 10.6 mg/L.
Delta Exports. Combined (state and federal pumps) total exports generally decreased from approximately 4,900 cfs to 1,000 cfs , annual export curtailments during April and May are intended to protect emigrating San Joaquin basin salmon smolts.
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 eight days between April 13 and April 26. A total of 100 O. mykiss were captured during the reporting period, increasing the season total to 765. Daily catch ranged between five and 19 O. mykiss (Figure 1). Average forklengths and weights of O. mykiss are provided in Table 1. Measured O. mykiss (Figure 2) were rated as fry (n=81), parr (n=15), silvery parr (n=2), and smolts (n=2).
Chinook salmon have not been captured this season.
Instantaneous temperatures recorded at the trap ranged from 50�F to 57�F, and turbidity ranged from 0.2 NTU to 2.2 NTU. Daily average flow fluctuated during the reporting period ranging between 107 cfs and 182 cfs at New Hogan Dam (NHG), and between 16 cfs to 36 cfs at Bellota (MRS). Daily average flow was one cfs at Cosgrove Creek (COS).
Table 1. Biosampling data for O. mykiss captured at Shelton Road between April 13 and April 26, 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 San Joaquin River Juvenile Migration Monitoring
Mossdale during the reporting period. Ten days (ten tows per day) of trawling were conducted between April 13 and April 26. A total of 127 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 245. Catch ranged between two and 26 Chinook per ten tows (Figure 3). Three acoustic tagged (VAMP study) Chinook were captured during the reporting period.
Figure 3. Chinook salmon catch (per ten tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2009.
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2009 Stanislaus River Juvenile Migration Monitoring
Stanislaus River seining surveys were conducted on April 14 at various locations between Oakdale (RM 40) and the confluence with the San Joaquin River. Due to high flows the Oakdale (RM 40) and the Highway 99 (RM 16) seine sites were not sampled.
A total of four Chinook salmon were captured at Caswell (RM 9) and salmon were not captured at the other three sites that were sampled. Forklengths ranged from 80 mm to 91 mm (avg: 85 mm). Average daily flow at Ripon was 621 cfs.
The rotary screw trap at Oakdale (RM 40) sampled continuously between April 13 and April 26. A total of 335 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 59,325. Daily catch ranged between zero and 106 Chinook (Figure 4). Average forklengths and weights of Chinook salmon are provided in Table 2 for 240 fish that were measured. Most measured Chinook were parr (n=66) and smolts (n=171), but some fry (n=3) were also observed.
No O. mykiss were captured during the sampling period.
No trap efficiency experiments were conducted due to insufficient daily catch.
Instantaneous temperature recorded at the trap ranged from 51�F to 54�F, and turbidity ranged from 0.6 NTU to 5.0 NTU. Daily average flow on the Stanislaus River increased during the reporting period ranging between 702 cfs and 1,208 cfs at Goodwin Dam (GDW), and between 621 cfs and 999 cfs at Ripon (RIP).
Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between April 13 and April 26, 2009. Parentheses indicate range.
Figure 4. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded by Goodwin Dam (GDW) and Ripon (RIP), 2009.
Figure 5. Individual Chinook salmon forklengths at Oakdale, 2009.
The rotary screw trap at Caswell State Park (RM 8) sampled continuously between April 13 and April 26. A total of 15 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 602. All measured Chinook were rated as smolts (n=15) and average forklength was 87 mm.
No O. mykiss were captured during the sampling period.
No trap efficiency experiments were conducted due to insufficient daily catch.
Instantaneous temperature recorded at the trap ranged from 55�F and 59�F, and turbidity ranged from 1.0 NTU to 4.8 NTU. Daily average flow at Ripon (RIP) fluctuated between 615 cfs and 1,010 cfs. |
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2009 Tuolumne River Juvenile Migration Monitoring
The eighth TID seining survey was conducted April 21 on the Tuolumne and San Joaquin rivers. A total of 14 juvenile Chinook salmon were captured in the Tuolumne River between Riffle 5 (RM 48.0) and Hickman Bridge (RM 31.6) and none were captured in the San Joaquin River. One (70 mm) O. mykiss was captured at Riffle 5 (RM 48.0). More detailed survey results are available at www.tuolumnerivertac.com/data.htm.
The rotary screw trap at Waterford (RM 30) operated continuously between April 13 and April 26. A total of 186 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 2,795. Daily catch ranged between one and 28 Chinook (Figure 6). Average forklengths and weights of Chinook salmon are provided in Table 3. Most of the measured Chinook were smolts (n=123), but there were also fry (n=27) and parr (n=17).
No O. mykiss were captured during the sampling period.
Instantaneous temperature recorded at the trap ranged from 53.6�F to 63.3�F, and turbidity ranged from 1.5 NTU to 4.2 NTU. Daily average flow at La Grange (LGN) exhibited an overall increasing trend ranging between 166 cfs and 681 cfs.
No trap efficiency experiments were conducted due to insufficient daily catch.
Table 3. Biosampling data for Chinook salmon captured and measured at Waterford between April 13 and April 26, 2009. Parentheses indicate range.
Figure 6. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded by La Grange (LGN) and Modesto (MOD), 2009.
Figure 7. Individual Chinook salmon forklengths at Waterford, 2009.
The side by side rotary screw trap configuration at Grayson (RM 5) operated continuously between April 13 and April 26. A total of seven juvenile Chinook salmon were captured during the reporting period, increasing the season total to 14. Daily catch ranged between zero and two Chinook (Figure 8). Average forklengths and weights of Chinook salmon are provided in Table 4. All of the measured Chinook were smolts (n=7).
No O. mykiss were captured during the sampling period.
Instantaneous temperature recorded at the trap ranged from 57.7�F to 67.0�F, and turbidity ranged from 3.1 NTU to 11.2 NTU. Daily average flow at Modesto (MOD) exhibited an overall increasing trend ranging between 236 cfs and 783 cfs.
No trap efficiency experiments were conducted due to insufficient daily catch.
Table 4. Biosampling data for Chinook salmon captured and measured at Grayson between April 13 and April 26, 2009. Parentheses indicate range.
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2009 Merced River Juvenile Migration Monitoring
The rotary screw trap at Hatfield State Park (RM 2) sampled 12 days between April 13 and April 26. The first juvenile Chinook salmon smolt (103 mm) of the season was captured during the reporting period. No O. mykiss were captured during the reporting period.
No trap efficiency experiments were conducted due to insufficient daily catch.
Instantaneous temperature recorded at the trap ranged from 58�F to 72�F, and turbidity ranged from 1.4 NTU to 5.0 NTU. Daily average flow at Cressy (CRS) was relatively stable during this reporting period ranging between 201 cfs and 255 cfs.
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During the reporting period, flow in the San Joaquin River at Vernalis exhibited an overall increasing trend ranging between 1,378 cfs and 2,042 cfs (Figure 9). Average daily water temperatures in the San Joaquin River ranged between 58.2�F and 67.3�F at Vernalis, between 59.2�F and 68.5�F at Mossdale; and between 61.8�F and 68.5�F at Rough 'n Ready Island (Figure 10). Average daily dissolved oxygen (DO) in the San Joaquin River ranged between 6.6 mg/L and 9.1 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 9.3 mg/L and 10.6 mg/L at Mossdale (Figure 11).
Figure 9. San Joaquin River flow at Vernalis, 2008/09.
Figure 10. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready, 2008/09.
Figure 11. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, 2008/09.
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Delta Exports
Combined (state and federal pumps) total exports generally decreased from approximately 4,900 cfs to 1,000 cfs , annual export curtailments during April and May are intended to protect emigrating San Joaquin basin salmon smolts. Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged between 850 cfs and 2,783 cfs (Figure 12). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 135 cfs and 2,201 cfs.
Figure 12. Daily exports at the C.W. Jones Pumping Plant (federal) and Harvey O. Banks Pumping Plant (state), 2008/09.
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