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Paddlefish Reproductive Ecology in M...

Schwinghamer, Christopher W.

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Paddlefish Reproductive Ecology in Missouri Reservoirs.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Paddlefish Reproductive Ecology in Missouri Reservoirs./
Author:	Schwinghamer, Christopher W.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	39 p.
Notes:	Source: Masters Abstracts International, Volume: 56-04.
Contained By:	Masters Abstracts International56-04(E).
Subject:	Biology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10283877
ISBN:	9781369835984

Paddlefish Reproductive Ecology in Missouri Reservoirs.
Schwinghamer, Christopher W.

Paddlefish Reproductive Ecology in Missouri Reservoirs. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 39 p.

Source: Masters Abstracts International, Volume: 56-04.

Thesis (M.S.)--Southeast Missouri State University, 2017.

The propagation of fish for stocking purposes is a common technique used to supplement species of conservation concern or to improve angling. Many paddlefish populations have declined from historic levels likely due to intense harvest (i.e., commercial and recreational) and habitat degradation (e.g., dams, floodplain loss). To supplement populations, state and federal agencies propagate paddlefish and currently propagation programs exist throughout the Eastern United States, Eastern Europe and China. As propagation programs arose, techniques evolved to maximize efficiency by improving fertilization and hatching rate, growth, and survival. Through propagation programs, several populations have been restored and some support quality recreational fisheries. In the early 1970's, the Missouri Department of Conservation determined that a paddlefish population could be established in Table Rock Lake and supplementation could build harvestable populations in two other reservoirs; Lake of the Ozarks and Harry S. Truman Lake. Stocking began in 1972 to restore populations and maintain recreational harvest opportunities. Currently these three reservoirs support quality paddlefish fisheries and are known for their success throughout the world. Even though paddlefish propagation in Missouri has been fruitful, additional efforts are underway to bolster success, particularly, collaboration with other entities to determine successful approaches that could be adopted. Through collaboration, unique intricacies have surfaced that should be implemented as propagation and restoration programs commence around the world. To this end, paddlefish propagation has been successful and will continue to play a role in restoring or creating paddlefish fisheries. Large river fishes (e.g. sturgeon and paddlefish) that have been sequestered in reservoirs are unable to sense environmental cues that illicit typical life history behaviors. These cues are masked by altered hydrology and temperature regimes. In many reservoirs throughout North America, paddlefish Polyodon spathula populations are potentially affected by these unnatural conditions. To begin to understand and identify the potential mechanisms that limit paddlefish reproduction in reservoir systems, I selected Truman Reservoir, Missouri as my study area of focus. This population is supplemented by stocking and while anecdotal evidence of potential natural reproduction exists, spawning has never been documented. I implanted 113 reproductively mature paddlefish with ultrasonic transmitters and the movements of these fish were tracked over two years. Difference in movement behaviors existed between sexes and spring aggregations were located in tributaries. Embryos and larvae were sampled in 2015 and 2016 near the spring aggregation location. Evidence of natural reproduction, acquired through the use of acoustic telemetry, suggests this technique is viable in freshwater systems and can be applied to determine spawning locations for paddlefish in large reservoir systems.

ISBN: 9781369835984Subjects--Topical Terms:

522710
Biology.

Paddlefish Reproductive Ecology in Missouri Reservoirs.
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520 $a The propagation of fish for stocking purposes is a common technique used to supplement species of conservation concern or to improve angling. Many paddlefish populations have declined from historic levels likely due to intense harvest (i.e., commercial and recreational) and habitat degradation (e.g., dams, floodplain loss). To supplement populations, state and federal agencies propagate paddlefish and currently propagation programs exist throughout the Eastern United States, Eastern Europe and China. As propagation programs arose, techniques evolved to maximize efficiency by improving fertilization and hatching rate, growth, and survival. Through propagation programs, several populations have been restored and some support quality recreational fisheries. In the early 1970's, the Missouri Department of Conservation determined that a paddlefish population could be established in Table Rock Lake and supplementation could build harvestable populations in two other reservoirs; Lake of the Ozarks and Harry S. Truman Lake. Stocking began in 1972 to restore populations and maintain recreational harvest opportunities. Currently these three reservoirs support quality paddlefish fisheries and are known for their success throughout the world. Even though paddlefish propagation in Missouri has been fruitful, additional efforts are underway to bolster success, particularly, collaboration with other entities to determine successful approaches that could be adopted. Through collaboration, unique intricacies have surfaced that should be implemented as propagation and restoration programs commence around the world. To this end, paddlefish propagation has been successful and will continue to play a role in restoring or creating paddlefish fisheries. Large river fishes (e.g. sturgeon and paddlefish) that have been sequestered in reservoirs are unable to sense environmental cues that illicit typical life history behaviors. These cues are masked by altered hydrology and temperature regimes. In many reservoirs throughout North America, paddlefish Polyodon spathula populations are potentially affected by these unnatural conditions. To begin to understand and identify the potential mechanisms that limit paddlefish reproduction in reservoir systems, I selected Truman Reservoir, Missouri as my study area of focus. This population is supplemented by stocking and while anecdotal evidence of potential natural reproduction exists, spawning has never been documented. I implanted 113 reproductively mature paddlefish with ultrasonic transmitters and the movements of these fish were tracked over two years. Difference in movement behaviors existed between sexes and spring aggregations were located in tributaries. Embryos and larvae were sampled in 2015 and 2016 near the spring aggregation location. Evidence of natural reproduction, acquired through the use of acoustic telemetry, suggests this technique is viable in freshwater systems and can be applied to determine spawning locations for paddlefish in large reservoir systems.
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