Category Archives: Early life history

Transitioning from One Life Stage to the Next

2016 Pallid Sturgeon Free Embryo Drift Study Continues and is Far from Completion By Pat Braaten July 20, 2016 The release of nearly 700,000 pallid sturgeon free embryos on June 27 (see previous blog entry 700,000 Baby Fish) marked the start … Continue reading

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A Change is Gonna Come

By Kimberly Chojnacki, and Aaron DeLonay With all the discussion of free embryos this summer, some readers may be left wondering what, exactly, is a ‘free embryo’.  A free embryo is a developing fish no longer within a protective chorion … Continue reading

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Steady Flows and Collaborative Science

By Robb Jacobson 7/6/2016 One of the key components to the Upper Missouri River Pallid Sturgeon Drift Experiment (see previous blog entry Pallid Sturgeon Free Embryo Drift Experiment Starts) was steady release of flow from Fort Peck Dam. Usually this … Continue reading

Posted in Early life history, Upper Missouri and Yellowstone Rivers |

Velocity Measurements in Support of the Drift Study

By Robb Jacobson and Susannah Erwin One of the key components of the Upper Missouri River Pallid Sturgeon Drift Study is the collection of detailed water-velocity information. Water velocities are used to calibrate the advection-dispersion model (see previous blog entry … Continue reading

Posted in Early life history, Methods, Upper Missouri and Yellowstone Rivers |

Night sampling for pallid sturgeon free embryos (The Fish Don’t Sleep and Neither Do We)

By Robb Jacobson and Aaron DeLonay The sample design for the Upper Missouri River Pallid Sturgeon Drift Experiment depends on nearly around-the-clock sampling for free-embryos, the life stage from hatch to the initiation of feeding.  It can be a grueling process … Continue reading

Posted in Early life history, Methods, Upper Missouri and Yellowstone Rivers |

Models and baby fish – digits, dye, particles, and biological reality

By Robb Jacobson and Ed Bulliner The Upper Missouri River Pallid Sturgeon Drift Study is ultimately about providing sound scientific information for smart decisions. The decisions relate to how to manage this large river to help recover the endangered pallid … Continue reading

Posted in Early life history, Technology, Upper Missouri and Yellowstone Rivers |

Boating the Upper Missouri River is not for the faint of heart

By Robb Jacobson The Upper Missouri River is mostly left to its own devices, allowed to migrate as it pleases. As a result, the river provides complex habitat that may lead to retention and growth of larval pallid sturgeon. The … Continue reading

Posted in Early life history, Upper Missouri and Yellowstone Rivers |

700,000 Baby Fish

On Monday afternoon, June 27, the collaborating scientists of the Missouri River Pallid Sturgeon Free Embryo Drift Study delivered over 700,000 one-day post hatch (dph) pallid sturgeon to the Upper Missouri River. The drift experiment has been over a year … Continue reading

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Pallid Sturgeon Free Embryo Drift Experiment Starts

By Robb Jacobson, and Casey Hickcox, June 26, 2016 Missouri River scientists started a large-scale collaborative study on June 24 to improve understanding of the fate of pallid sturgeon free embryos (from hatch through first feeding) in the Upper Missouri River (figure 1).  The study … Continue reading

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Sturgeon biology and plumbing

By Robert Jacobson, Aaron DeLonay, Kimberly Chojnacki, and Casey Hickcox This spring, Columbia Environmental Research Center (CERC) scientists are conducting laboratory experiments to better understand how temperature affects early development of sturgeon species.  The emphasis is on quantifying development rates … Continue reading

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