Author Archives: Kimberly Chojnacki

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

Posted in Early life history, Pallid sturgeon | Tagged , , |

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

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

Missouri River Dye Trace Experiment to Support Understanding of Free Embryo Drift

By Robb Jacobson, June 27, 2016 Missouri River scientists started the first phase of the pallid sturgeon free embryo drift study by employing a standard method to understand how hydraulic processes vary the rate of downstream transport of dissolved constituents … Continue reading

Posted in Methods, Upper Missouri and Yellowstone Rivers |

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

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

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

Posted in Early life history, Pallid sturgeon | Tagged , , , , , |