Tag Archives: Larvae

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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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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Which came first, the sturgeon or the egg?

While the Comprehensive Sturgeon Research Project (CSRP) at the USGS Columbia Environmental Research Center (CERC) is focused on pallid sturgeon (Scaphirhynchus albus) and the closely-related shovelnose sturgeon (S. platorynchus), the CERC also conducts behavioral, physiological and toxicological research on other … Continue reading

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Day old sturgeon caught in Lower Missouri River

Biologists sampled a suspected pallid sturgeon spawning site approximately 4 miles up the James River from its confluence with the Missouri River in South Dakota on May 12 and 13.  Two days of sampling resulted in the collection of 84 larval paddlefish, … Continue reading

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Searching for a needle in a haystack

Female pallid sturgeon with eggs are very rare on the Lower Missouri River.  When one spawns she will release as few as 8,000 to 20,000 eggs over a 12 to 36 hour period.  Those eggs are released in swift water … Continue reading

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