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.
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Pallid Sturgeon Release
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.
Female Pallid Sturgeon
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.
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.
Montana Ultrasound
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.
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.
Net Drift
USGS biologists drift trammel nets on the Yellowstone River, near Fairview, Montana to capture male pallid sturgeon.
USGS biologists drift trammel nets on the Yellowstone River, near Fairview, Montana to capture male pallid sturgeon.
Sunset at Intake
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.
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.
Female pallid sturgeon, PLS11-007, is released back into the Missouri
Female pallid sturgeon, PLS11-007, is released back into the Missouri River after an ultrasound evaluation
Female pallid sturgeon, PLS11-007, is released back into the Missouri River after an ultrasound evaluation
The R/V Slim Funk
The Columbia Environmental Research Center's R/V Slim Funk is shown.
The Columbia Environmental Research Center's R/V Slim Funk is shown.
Silver and Bighead Carp
These silver and bighead carp were collected on the Illinois River to learn more about the anatomy and physiology of Asian carp. This information will guide the development of potential biological or chemical controls as part of an integrated pest management approach for natural resource managers.
These silver and bighead carp were collected on the Illinois River to learn more about the anatomy and physiology of Asian carp. This information will guide the development of potential biological or chemical controls as part of an integrated pest management approach for natural resource managers.
Pallid Sturgeon In Water
The sharp scutes along the back of the pallid sturgeon can be seen above the murky water it lives in.
The sharp scutes along the back of the pallid sturgeon can be seen above the murky water it lives in.
Pallid Sturgeon Release
Following surgery and transmitter implantation, pallid sturgeon PLS11-002 was released at her capture location in the Lower Missouri River.
Following surgery and transmitter implantation, pallid sturgeon PLS11-002 was released at her capture location in the Lower Missouri River.
Pallid Sturgeon Release
Following surgery and transmitter implantation, pallid sturgeon PLS11-002 was released at her capture location in the Lower Missouri River.
Following surgery and transmitter implantation, pallid sturgeon PLS11-002 was released at her capture location in the Lower Missouri River.
Pallid Sturgeon Surgery
An incision just big enough to fit the transmitter is made in the belly of the sturgeon and a few stitches close it up. The stitches eventually dissolve but a small scar remains visible.
An incision just big enough to fit the transmitter is made in the belly of the sturgeon and a few stitches close it up. The stitches eventually dissolve but a small scar remains visible.
Sampling for Acipenseriformes
USGS scientist retrieves the sampling net from the Missouri River.
USGS scientist retrieves the sampling net from the Missouri River.
Sampling for Acipenseriformes
USGS scientist records data from the flowmeter measuring the volume of water sampled by the ichthyoplankton sampling net.
USGS scientist records data from the flowmeter measuring the volume of water sampled by the ichthyoplankton sampling net.
Jumping Silver Carp
Silver carp are a large a troublesome invasive species from Asia found in the great rivers of the central United States. Silver carp have been observed to jump in response to rocks thrown in the water, passing trains, geese taking off from the water, or just when they unexpectedly find themselves in a tight place.
Silver carp are a large a troublesome invasive species from Asia found in the great rivers of the central United States. Silver carp have been observed to jump in response to rocks thrown in the water, passing trains, geese taking off from the water, or just when they unexpectedly find themselves in a tight place.
Winter Boating at Cougar
Two employees install equipment at Cougar Dam on a cold and wintery day.
Two employees install equipment at Cougar Dam on a cold and wintery day.
The View From Above
The view of Cougar Dam and the fish facility from the upper cliff side.
The view of Cougar Dam and the fish facility from the upper cliff side.
Larvae Sampling Net
An ichthyoplankton sampling net being deployed in the Missouri River.
An ichthyoplankton sampling net being deployed in the Missouri River.
Sorting Larvae Samples
Hallie Ladd, Beau Griffith and Jeff Beasley, Five Rivers Services, LLC biologists sorting through larvae samples collected from the Missouri River.
Hallie Ladd, Beau Griffith and Jeff Beasley, Five Rivers Services, LLC biologists sorting through larvae samples collected from the Missouri River.
Alder Creek
The USGS had a antenna sight set up at Alder Creek to monitor fish movements through this dead forest killed by the eruption of Mt. Saint Helens
The USGS had a antenna sight set up at Alder Creek to monitor fish movements through this dead forest killed by the eruption of Mt. Saint Helens
Sunset on the River
Looking out over the Georgiana Slough near our floating houseboat used for fish tagging.
Looking out over the Georgiana Slough near our floating houseboat used for fish tagging.