Category Archives: Early life history

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

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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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Stream studies back in action

By Aaron DeLonay, Robert Jacobson, Kim Chojnacki, and Casey Hickcox Final preparations are underway to initiate lake sturgeon laboratory and artificial stream studies at the Columbia Environmental Research Center (CERC).  One 46.5 lb. female and three males have been selected … 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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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

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One Down, Several to Go

On May 7th, the CSRP sampling crew on the Missouri River in Nebraska reported the first free embryo capture of the season. Crews equipped with fine mesh nets have been sampling the Missouri and Platte Rivers for drifting embryos since … Continue reading

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We’ve Only Just Begun

After a long, cold winter, the Redbud and Dogwood trees are blooming and water temperatures are rising (Figure 1).  Spring seems to have finally sprung, and fish, and hopefully the endangered pallid sturgeon among them, will soon be spawning.  In … Continue reading

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