| Volume 2, Issue 14 |
May 9, 2008 | |
Upcoming Events
June 12: TRTAC
October 22-24: CALFED Science Conference
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Key Highlights
2007/08 Juvenile Migration Monitoring. Catch increased greatly at the Mossdale Trawl starting on May 16, when flows decreased to meet VAMP instream flow requirements. The final Tuolumne River seining survey was conducted by TID on May 27.
San Joaquin River Conditions. San Joaquin River water temperatures fluctuated throughout the reporting period with an overall increasing trend for water temperatures observed at both Mossdale and the deep water ship channel. Dissolved oxygen fluctuated throughout the reporting period with an overall increasing trend observed at Mossdale and an overall decreasing trend observed at the deep water ship channel. Flow conditions decreased as a result of VAMP instream requirements.
Delta Exports. Combined total exports (state and federal pumps) fluctuated throughout the reporting period and ranged between 932 cfs (May 17) and 2,629 cfs (June 1).
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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2007/08 Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 29) sampled 11 out of 21 days between May 12 and June 1.
A total of 186 O. mykiss were captured during the reporting period, increasing the season total to 1,565. Daily catch ranged between three and 29 O. mykiss. A total of 178 young-of-year (YOY; ≤100 mm) and eight Age 1+ (101-299 mm) O. mykiss were captured. Average forklengths and weights of O. mykiss are provided in Table 1. Most of the O. mykiss captured and measured were rated as parr (n=147) however there were also some fry (n=9), silvery parr (n=6), and smolts (n=3).
No Chinook were captured during this reporting period.
Table 1. Biosampling data for O. mykiss captured and measured at Shelton Road between May 12 and June 1, 2008. Parentheses indicate range.
Instantaneous temperatures taken at the trap ranged from 54ºF to 58ºF, and turbidity ranged from 2.3 NTU to 12.7 NTU. Daily average flow fluctuated between 139 cfs and 235 cfs at New Hogan Dam (NHG), between 28 cfs and 40 cfs at Bellota (MRS), and zero cfs at Cosgrove (COS).
The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled 15 out of 21 days between May 12 and June 1.
A total of 206 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 21,142. Daily catch ranged between zero and 33 Chinook. Average forklengths and weights of Chinook salmon are provided in Table 2 for 202 fish that were measured. All measured Chinook were smolts (n=202), including two larger fish (i.e., > 100 mm).
A total of three O. mykiss were captured during this reporting period. Average forklengths and weights of O. mykiss are provided in Table 2.
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between May 12 and June 1, 2008. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 55ºF to 59ºF, and turbidity ranged from 0.3 NTU to 2.2 NTU. Daily average flow fluctuated between 504 cfs and 1,506 cfs at Goodwin Dam (GDW) and fluctuated between 508 cfs and 1,317 cfs at Orange Blossom Bridge (OBB).
No trap efficiency releases were conducted during this reporting period.
The Stanislaus River rotary screw trap at Caswell (RM 8) sampled 18 out of 21 days between May 12 and June 1.
A total of 51 juvenile Chinook salmon smolts were captured during the reporting period, increasing the season total to 222. Average forklengths and weights of Chinook salmon are provided in Table 3.
Table 3. Biosampling data for Chinook salmon captured and measured at Caswell between May 12 and June 1, 2008. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 59ºF to 65ºF, and turbidity ranged from 1.5 NTU to 4.2 NTU. Daily average flow ranged between 551 cfs and 1,359 cfs at Ripon (RIP).
Three trap efficiency releases were conducted during the reporting period which resulted in a range of trap efficiency between 0.2% and 1.2%.
The Tuolumne River rotary screw trap at Waterford (RM 30) sampled continuously between May 12 and June 1.
A total of 377 juvenile Chinook salmon were captured during the reporting period, increasing the season total to 3,333. Daily catch ranged between zero and 55 Chinook. Average forklengths and weights of Chinook salmon are provided in Table 4 for 368 fish that were measured. Most of the measured Chinook were smolts (n=348), including 15 larger fish (i.e. >100 mm), but there were also some fry (n=5).
One O. mykiss parr was captured on May 23, increasing the season total to nine (Table 4).
Table 4. Biosampling data for Chinook salmon and O. mykiss captured and measured at Waterford between May 12 and June 1, 2008. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 58ºF to 68ºF, and turbidity ranged from 0.3 NTU to 4.4 NTU. Daily average flow ranged between 98 cfs and 830 cfs at La Grange (LGN).
One trap efficiency release was conducted on May 16 which yielded 12.2% efficiency (preliminary result; Table 5).
Table 5. Trap efficiency tests conducted at Waterford between May 12 and June 1, 2008.
The Tuolumne River rotary screw traps at Grayson (RM 5) sampled continuously between May 12 and June 1.
A total of six juvenile Chinook salmon smolts were captured during the reporting period, increasing the season total to 185. Daily catch ranged between zero and two Chinook. Average forklengths and weights of Chinook salmon are provided in Table 6.
No O. mykiss were captured during the reporting period.
Table 6. Biosampling data for Chinook salmon captured at Grayson between May 12 and June 1, 2008. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 62ºF to 69ºF, and turbidity ranged from 1.6 NTU to 6.8 NTU. Daily average flow fluctuated between 284 cfs and 1,040 cfs at Modesto (MOD).
Two trap efficiency releases were conducted on May 14 and May 21. Preliminary efficiency results were 2.5% and 3.7%, respectively (Table 7). .
Table 7. Trap efficiency tests conducted at Grayson between May 12 and June 1, 2008.
The 2008 TID seining study surveys nine and ten were conducted between May 12 and Jun 1 at various locations on the Tuolumne and San Joaquin Rivers.
Survey number nine was conducted on May 13. One 73 mm Chinook salmon smolt was captured in the Tuolumne River at Hickman Bridge (RM 31.6), and none were captured at the San Joaquin seine sites. One 28 mm (forklength) O. mykiss fry was captured in the Tuolumne River at OLGB (RM 50.5).
Survey number ten was conducted on May 27 and is the final survey for this study year. A total of four Chinook salmon fry (36-39 mm forklength) were captured in the Tuolumne River at R5 (RM 48.0). One 85 mm (forklength) Chinook salmon smolt was captured at Hickman Bridge (RM 31.6). No O. mykiss were captured during the survey.
During the ninth survey, flows were about 860 cfs in the Tuolumne River at La Grange (LGN) and about 3,000 cfs in the San Joaquin River at Vernalis (VNS). Flows decreased between the ninth and tenth surveys due to Vernalis Adaptive Management Plan (VAMP) instream flow requirements.
The Merced River rotary screw traps at Hatfield (RM 2) were sampled between May 12 and June 1.
A total of five unmarked Chinook salmon smolts (possible natural origin) were captured, increasing the season total to 61. Average forklengths and weights of Chinook salmon are provided in Table 9.
No O. mykiss were captured during this reporting period.
Table 9. Biosampling data for Chinook salmon captured at Hatfield between May 12 and June 1, 2008. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 59ºF to 69ºF, and turbidity ranged from 1.5 NTU to 7.7 NTU. Daily average flow at Cressy (CRS) ranged between 134 cfs and 1,267 cfs.
The San Joaquin River trawl sampling at Mossdale (RM 54) continued between May 12 and June 1 by the California Department of Fish and Game.
Daily catch ranged from 9-296 Chinook per ten tows. Catch increased greatly starting on May 16, when flows decreased to meet VAMP instream flow requirements. Three O. mykiss were captured during the reporting period.
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San Joaquin River Conditions
 During the reporting period, flows in the San Joaquin River at Vernalis decreased from 3,473 cfs to 1,493 cfs. Water temperatures in the San Joaquin exhibited an overall increasing trend with fluctuations between 63.0 °F and 71.7 °F (avg: 66.9 °F) at Vernalis; between 64.3 °F and 73.8 °F (avg: 68.0 °F) at Mossdale; and between 65.9 °F and 74.3 °F (avg: 70.1 °F) at Rough 'n Ready Island. Dissolved oxygen (DO) in the San Joaquin River exhibited an overall decreasing trend in the deep water ship channel (measured at Rough 'n Ready Island) with fluctuations between 3.9 mg/L and 8.0 mg/L (avg: 6.0 mg/L) and exhibited a general increasing trend at Mossdale with fluctuations between 9.5 mg/L and 14.2 mg/L (avg: 10.7 mg/L).
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Delta Exports
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) fluctuated throughout the reporting period and ranged between 835 cfs and 1,054 cfs. Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) fluctuated throughout the reporting period and ranged between 92 cfs and 1,575 cfs. Combined total exports (state and federal pumps) fluctuated throughout the reporting period and ranged between 932 cfs (May 17) and 2,629 cfs (June 1).
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