Aspects of the Life History of the Shovelnose Sturgeon, Scaphirhynchus Platorynchus (Rafinesque) in the Missouri River PDF Download
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Author: Paul L. Zweiacker
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 92
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Author: Paul L. Zweiacker
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 92
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Author: Wisconsin. Department of Natural Resources. Bureau of Research
Publisher:
ISBN:
Category : Chippewa River Watershed (Wis.)
Languages : en
Pages :
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Book Description
To prove that basic life history information, now entirely lacking, most essential to development of management strategy for the shovelnose sturgeon, including extent of movement, fecundity, time of spawning, extent of natural reproduction, and rate of growth.
Author: Mark Lee Wildhaber
Publisher: Geological Survey (USGS)
ISBN: 9781411319059
Category : Shovelnose sturgeon
Languages : en
Pages : 18
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Author: Richard E. Moos
Publisher:
ISBN:
Category : Shovelnose sturgeon
Languages : en
Pages : 426
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Author: Vincent J. Burke
Publisher:
ISBN:
Category : Natural resources
Languages : en
Pages : 168
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Author: Vadim J. Birstein
Publisher: Springer Science & Business Media
ISBN: 0306468549
Category : Science
Languages : en
Pages : 444
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Book Description
Selected, reviewed and revised papers from the International Conference on Sturgeon Biodiversity and Conservation held at The American Museum of Natural History in New York on 28-30 July 1994
Author: John W. Held
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 25
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Author: Sara Joy Tripp
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Shovelnose sturgeon Scaphirhynchus platorynchus in the Middle Mississippi River is one of the last commercially viable sturgeon populations in the world. To determine whether commercial harvest of the black-egg (sexually mature) females is impacting this population, information regarding sex-specific demographics and the reproductive life history is required. Adult shovelnose sturgeon were sampled using gill nets (5-cm bar mesh) monthly during February 2005 through July 2006 at three sites on the Middle Mississippi River between Cairo, IL and St. Louis, MO; (RKM: 201-198; 191-188, and RKM 127-124). Of all shovelnose sturgeon sampled, 363 were females and 416 were males, deviating from 1:1 (p=0.06). Sex-specific length frequency distributions differed (p=0.03) with females having a larger median fork length (614 mm). Compared to historical data, the population shifted towards longer fish, and somatic growth declined. The population also shifted towards older fish with reduced recruitment. Age at maturity was later than previously reported, with females maturing at a mean age of 10.5 years and males at 9 years of age. Total egg count was slightly lower than previously reported with a mean of 29,573/female. However, the spawning cycle had not changed with most males and females spawning every 2 and 3 years, respectively. Larval sturgeon were also sampled to link age at maturation, timing and periodicity of spawning, and larval growth rates. Larval sturgeon occurred during June and July of 2005 and May and June of 2006, confirming successful spawning. Larval sturgeon grew between 0.69 to 1.69 mm total length per day among four distinct cohorts produced each year. For the first time for this population, sturgeon were found to spawn during the fall. Fall sturgeon contained ripe eggs with polarization indexes (PIs)
Author: Timothy Charles Modde
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 218
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Author:
Publisher:
ISBN:
Category : Administrative law
Languages : en
Pages : 1040
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