Author Archives: Kimberly Chojnacki

Evidence of Successful Spawning by Endangered Pallid Sturgeon

By Aaron DeLonay, Kimberly Chojnacki and Robert Jacobson Three free embryos that were collected by Comprehensive Sturgeon Research Project scientists in May 2014 were recently confirmed to be pallid sturgeon.  The three specimens were among several hundred paddlefish and closely-related … Continue reading

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Through the Looking Glass

By Kimberly Chojnacki and Aaron DeLonay Pallid sturgeon eggs are approximately three millimeters, or less than one eight of an inch, in diameter. While the eggs of this endangered sturgeon are small, the changes that happen inside are truly a … Continue reading

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Spawning of Pallid Sturgeon for Crucial Experiments

By Kimberly Chojnacki, Aaron DeLonay, and Robert Jacobson Researchers at the USGS Columbia Environmental Research Center (CERC) have been making preparations to spawn pallid sturgeon to provide eggs and larvae for experiments.  During March and April, the captive population of … Continue reading

Posted in Early life history, Pallid sturgeon, Sturgeon culture and propagation | Tagged , |

Studies of Lake Sturgeon Free Embryo Dispersal Begin

By Aaron DeLonay and Kimberly Chojnacki How much river does a fish need?  For pallid sturgeon on the Missouri River there is a concern that there is not enough river for downstream-dispersing larvae.  Field-based and laboratory work at the Columbia Environmental … Continue reading

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What a Difference a Day Makes

By: Kimberly Chojnacki and Aaron DeLonay Scientists at the USGS, Columbia Environmental Research Center have initiated research that closely examines the differences in early life stages of three sturgeon species; lake sturgeon, pallid sturgeon, and shovelnose sturgeon.  On Wednesday, April … Continue reading

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Still Catching Free Embryo Sturgeon

By Alexandra Laboile, Kimberly Chojnacki, and Aaron DeLonay Previous studies by CSRP scientists and others have indicated that the timing and duration of spawning for paddlefish and sturgeon in the Missouri River are dependent upon water temperature.  Each spring for … Continue reading

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July River Sweep

By Kimberly Chojnacki and Aaron DeLonay The researchers of the Comprehensive Sturgeon Research Project (CSRP) have defined a “river sweep” as an attempt to search for telemetered pallid sturgeon in as much of the Lower Missouri River (from the Gavins … Continue reading

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Yellowstone River Habitat Update

By Carrie Elliott In the Northern Great Plains mid-late June is marked by spectacular thunderstorms, an occasional mosquito swarm, and pallid sturgeon spawning season on the Yellowstone River.  The week of June 16 the U.S. Geological Survey CSRP habitat crew … Continue reading

Posted in Habitat mapping, Upper Missouri and Yellowstone Rivers | Tagged |

Northbound

By Kimberly Chojnacki and Aaron DeLonay In mid-June, 4 USGS research crews from the Lower Missouri River packed up their equipment and headed north to the Upper Missouri and Yellowstone Rivers in Montana (figure 1).  Two boats and crews were … Continue reading

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A Change Will Do You Good

By Aaron DeLonay, Amy George, and Kimberly Chojnacki Rows of hatching jars lined the shelves in the laboratory at USGS this spring and summer.  In each jar, pallid sturgeon and shovelnose sturgeon gently tumbled in the 18 °C water as … Continue reading

Posted in Early life history |