Merced River Juvenile Chinook Outmigration E-mail Updates


Merced River Juvenile Chinook Outmigration Update March 15, 2007

Sampling Period: February 26 - March 11, 2007

Hatfield State Park:

Zero Chinook salmon were collected during this sampling period. However, some non-target species were collected including: golden shiner, white catfish, channel catfish, red-ear sunfish, and prickly sculpin (Figure 1).

Figure 1. From left to right: channel catfish (34mm, captured on Mar. 4^th), rotary screw traps at Hatfield State Park (RM 2) and golden shiner (106 mm, captured on Mar. 3^rd). [click buttons to view larger photo]

Zero O. mykiss were collected during this sample period.

No trap efficiency tests were conducted during this sampling period.

Environmental Data:

Instantaneous water temperature measured at the Hatfield rotary screw trap ranged from 52.0°F to 60.0°F. Instantaneous turbidity measured at Hatfield rotary screw trap ranged from 2.0 NTU to 12.2 NTU. During the sampling period flows, at Snelling (MSN; RM 46) ranged from 281 cfs to 323 cfs and at Cressy (CRS; RM 27) from 213 cfs to 336 cfs. Due to a significant rain event hourly flows in Dry Creek (DSN; confluence at RM 31.5), which is a significant tributary to the Merced River, peaked at 524 cfs on February 27^th and at 375 cfs on February 28^th.

If you do not wish to be included in this distribution, please send an e-mail to webmaster@fishsciences.net requesting to be removed. To view the online version of this summary go to www.fishsciences.net/projects/merced/hatcard/hatfieldpostcard3.htm. or please visit our Merced River Projects Home Page at www.fishsciences.net/projects/merced.

Funding provided by Comprehensive Assessment and Monitoring Program (CAMP) and is administered by U.S. Fish and Wildlife Service Anadromous Fish Restoration Program (AFRP). Additional field support provided by U.S. Fish and Wildlife Service (USFWS; Stockton Office).