http://gallery.usgs.gov/images/logos/usgs_only.jpg http://gallery.usgs.gov/ en-us OC_Web@usgs.gov (Office of Communications Web Group) http://gallery.usgs.gov/images/USGS.gif http://gallery.usgs.gov/ http://gallery.usgs.gov/photos/04_16_2013_gkb4EQp11X_04_16_2013_0 Missouri River lake sturgeon.

]]> http://gallery.usgs.gov/photos/04_16_2013_gkb4EQp11X_04_16_2013_1 Missouri River lake sturgeon

]]> http://gallery.usgs.gov/photos/04_01_2013_aEuh8KJ876_04_01_2013_0 Ring-billed gulls line a sand bar along the Missouri River to watch USGS boats fish for sturgeon.

]]> http://gallery.usgs.gov/photos/04_01_2013_aEuh8KJ876_04_01_2013_1 A wild turkey perches on a rock dike in the Missouri River to get a closer look at USGS boats fishing for sturgeon.

 

]]> http://gallery.usgs.gov/photos/03_29_2013_xDTf8JIvu5_03_29_2013_0 CSRP Biologist Sabrina Davenport holding reproductive feamle pallid sturgeon, PLS11-020.

]]> http://gallery.usgs.gov/photos/02_22_2013_y17Gxk3WVq_02_22_2013_0 USGS biological science aid, Jeff Beasley, retreives a temperatue logger from the Missouri River near Decatur, NE.

]]> http://gallery.usgs.gov/photos/02_21_2013_fja4DQo10W_02_21_2013_0 Ice on the MO River near Omaha, NE.

]]> http://gallery.usgs.gov/photos/01_18_2013_ch8Jbn4AYu_01_18_2013_0 CRSP biologists travelled along the Missouri and Mississippi rivers in search of usable boat ramps.  Pictured is a ramp located near Cape Girardeau, MO.

]]> http://gallery.usgs.gov/photos/01_18_2013_ch8Jbn4AYu_01_18_2013_1 CRSP biologists travelled along the Missouri and Mississippi rivers in search of usable boat ramps.  Pictured is a ramp Grand Tower, IL.

]]> http://gallery.usgs.gov/photos/12_18_2012_m62Tlx7KJe_12_18_2012_0 Biologists Hallie Ladd and Chad Vishy give a presentation about the comprehensive sturgeon research project to Hickman High School students.

]]> http://gallery.usgs.gov/photos/12_18_2012_m62Tlx7KJe_12_18_2012_1 Students from Hickman High School’s biology club ask questions during an educational tour at the Columbia Environmental Research Center (Columbia, MO).

]]> http://gallery.usgs.gov/photos/11_19_2012_fJAm1QP108_11_19_2012_0 Pre-spawn ultrasound image of reproductive female pallid sturgeon PLS11-016:  the green arrow points to a ripe egg in the side view of the fish's abdominal cavity.

]]> http://gallery.usgs.gov/photos/09_25_2012_pul8OBa44H_09_25_2012_0 A free-drifting sturgeon embryo was captured in the Lower Missouri River in late August.  Most sturgeon in the lower Missouri River spawn in the springtime. 

]]> http://gallery.usgs.gov/photos/08_27_2012_jOFq37Thg0_08_27_2012_0 Eggs collected from pallid sturgeon spawned in hatcheries are placed onto an artificial rock substrate.  Pallid sturgeon eggs are extremely sticky after fertilization and adhere to the artificial substrate, even in a current. 

]]> http://gallery.usgs.gov/photos/08_15_2012_eJAl15Ocb7_08_15_2012_0 Biologists prepare to perform ultrasound and an egg biopsy on female pallid sturgeon, radio code 30, to determine how close to spawning she is or whether spawning may already have occurred.  Biologists from Montana Fish, Wildlife and Parks determined that code 30 eventually spawned in the Yellowstone River on July 19-20, 2012.

]]> http://gallery.usgs.gov/photos/08_13_2012_qULx5CB543_08_13_2012_0 Biologists were able to document the spawning of female pallid sturgeon code 30 as she released during a recapture event in the Yellowstone River near Fairview, MT.

]]> http://gallery.usgs.gov/photos/07_20_2012_cHXj04May7_07_20_2012_0 A large male pallid sturgeon captured by the USGS on the Yellowstone River is scanned with a portable ultrasound device to determine if it is “ripe” and ready to reproduce.

]]> http://gallery.usgs.gov/photos/07_20_2012_cHXj04May7_07_20_2012_1 USGS biologists drift trammel nets on the Yellowstone River, near Fairview, Montana to capture male pallid sturgeon.

]]> http://gallery.usgs.gov/photos/07_13_2012_fJAm15Occ8_07_13_2012_0 The sun sets below the horizon as USGS telemetry-tracking crews follow the upstream migration of male pallid sturgeon, code 52, below Intake Diversion Dam, Montana on June 9, 2012.

]]> http://gallery.usgs.gov/photos/07_09_2012_yDTg83Jvv5_07_09_2012_0 Biologist, Dave Combs prepares a tracking boat (foreground) and a DIDSON survey boat (background) to search the Yellowstone River for tagged pallid sturgeon, Near Fairview, Montana.  Pallid sturgeon in Montana are tagged with radio telemetry transmitters that are detected with large antennas mounted the boats.

]]> http://gallery.usgs.gov/photos/07_09_2012_yDTg83Jvv5_07_09_2012_1 USGS Fishery Biologist, Pat Braaten, and biologists from USGS Columbia Environmental Research Center and the Fort Peck Field Office release a telemetry-tagged, female pallid sturgeon after recapturing her to check her reproductive status.   She was still full of ripe, black eggs, and had not yet spawned when she was netted.

]]> http://gallery.usgs.gov/photos/03_29_2012_rVMy5CBoo3_03_29_2012_0 Biologist Dave Combs, holds female pallid sturgeon PLS11-007 recaptured on March 15, 2012.  This female is in reproductive condition and will spawn in the spring of 2012.

]]> http://gallery.usgs.gov/photos/12_13_2011_fkb4EqpDCW_12_13_2011_0 Mikhail Malin, visiting IBIW scientist, prepares to lowers a hydroacoustic transducer into the water from a CERC research vessel below Bagnell Dam on the Osage River, Missouri.  The CERC and IBIW collaborated with the Missouri Cooperative Fish and Wildlife Research Unit at the University of Missouri to assess the distribution of paddlefish below the dam using telemetry, sidescan sonar, and DIDSON.

]]> http://gallery.usgs.gov/photos/12_13_2011_h40Of66EEy_12_13_2011_0 Nine-year-old pallid sturgeon wait in holding tanks for their turn to be evaluated by biologists at CERC.  More than 100 pallid sturgeon made the trip from Gavins Point National Fish Hatchery to Columbia on a snowy December day.

]]> http://gallery.usgs.gov/photos/12_12_2011_mqh6KWv33E_12_12_2011_0 Sabrina Davenport and Caleb Troutt, Five Rivers Services, LLC biologists performing work on the Missouri River for the CERC, hold pallid sturgeon PLS09-012 recaptured on November 1, 2011 near Nebraska City, Nebraska.  Female pallid sturgeon PLS09-012 is in reproductive condition and will spawn in the spring of 2012.

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