Category Archives: Reproductive Female

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

Posted in Early life history, Pallid sturgeon, Reproductive Female, Spawning, Sturgeon culture and propagation, Technology | Tagged , , |

Experiments on Early Sturgeon Development

By Robert Jacobson, Aaron DeLonay, Kimberly Chojnacki, and Casey Hickcox Pallid sturgeon (Scaphirhynchus albus), like most fish, are cold-blooded.  This means that their metabolism is regulated by the temperature of the water in which they live.  As water warms, developmental … Continue reading

Posted in Early life history, Pallid sturgeon, Reproductive Female, Spawning | Tagged , , |

Habitat surveys of 2015 pallid sturgeon spawning patches on the Yellowstone River

By Carrie Elliott, Robb Jacobson, and Casey Hickcox During the last two weeks of June, USGS habitat crews surveyed the pallid sturgeon spawning reach of the Lower Yellowstone River near Fairview, North Dakota.  Using a compact multibeam sonar echosounder system … Continue reading

Posted in Habitat mapping, Methods, Pallid sturgeon, Reproductive Female, Spawning, Telemetry tracking, Upper Missouri and Yellowstone Rivers | Tagged , , |

Repeating Sturgeon Behaviors

By Hallie Ladd and Aaron DeLonay Scientists in the Comprehensive Sturgeon Research Project have learned from long-term telemetry tracking studies that female pallid sturgeon in the Lower Missouri River can spawn as often as every 2 to 3 years and … Continue reading

Posted in Recapture, Reproductive Female, Spawning |

A Spawning Recorded in the Yellowstone River

By Patrick Braaten She was initially captured in September 1993, but at the time, the sex and reproductive status of the 1325 mm, 15.9 kg pallid sturgeon were not determined. She was implanted with a passive integrated transponder (PIT) tag … Continue reading

Posted in Recapture, Reproductive Female, Spawning, Telemetry tracking, Upper Missouri and Yellowstone Rivers | Tagged , , |

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

Posted in Recapture, Reproductive Female, River Sweep | Tagged , , |

Are You Ready For Spring?

It may seem a bit early to ask this question, but the spring spawning season is never far from CSRP biologist’s minds (see previous post Thinking Ahead).  Preparations for the 2014 spring season started early in the fall when crews … Continue reading

Posted in Recapture, Reproductive Female |

The Gang of Eight

While we are far from Washington, DC, we have our own form of the bipartisan Gang of Eight; eight reproductive pallid sturgeon, fitted with radio telemetry tags, and ready to spawn this spring.  Four of these individual are currently located … Continue reading

Posted in Reproductive Female, Telemetry tracking |

Sometimes The Missouri River Is A Lonely Place

In late February and March the Missouri River is a lonely place.  Comprehensive Sturgeon Research Project boats from the USGS and the Nebraska Game and Parks Commission search the cold, still waters for the telltale chirp of a telemetry transmitter … Continue reading

Posted in Reproductive Female |

Where The Girls Are

October proved to be a busy and successful month for USGS Comprehensive Sturgeon Research Project biologists as four reproductive female pallid sturgeon were targeted and recaptured between river miles 359 and 599.  Using a portable ultrasound device, scientists were able … Continue reading

Posted in Reproductive Female, Telemetry tracking |