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Walleye stocking in Wisconsin lakes:...

Fayram, Andrew H.

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Walleye stocking in Wisconsin lakes: Species interactions, changes in angler effort, optimal stocking rates, and effects on community maturity.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Walleye stocking in Wisconsin lakes: Species interactions, changes in angler effort, optimal stocking rates, and effects on community maturity./
Author:	Fayram, Andrew H.
Description:	132 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1263.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168206
ISBN:	0542040549

Walleye stocking in Wisconsin lakes: Species interactions, changes in angler effort, optimal stocking rates, and effects on community maturity.
Fayram, Andrew H.

Walleye stocking in Wisconsin lakes: Species interactions, changes in angler effort, optimal stocking rates, and effects on community maturity. - 132 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1263.

Thesis (Ph.D.)--The University of Wisconsin - Milwaukee, 2005.

Fish stocking is common throughout the world. Reasons for stocking vary from preventing species extinction to increasing fishing opportunities for recreational anglers. Each year, many billions of fish are stocked in waters throughout the world; over one billion walleyes are stocked in North America alone. Understanding how stocked fish impact aquatic communities is critical given the large number of fish that are stocked into aquatic systems throughout the world. I used new and historic data sets to examine effects of walleye stocking on angler effort, species interactions, and community maturity. I also determined the stocking rate that maximizes walleye survival in Wisconsin lakes. The act of walleye stocking can alter angler effort independently from changes in population density. For a given density of walleyes, anglers spend a greater amount of time fishing for walleyes in lakes that are stocked than in those that are not. Similarly, walleye stocking can effect the amount of time anglers spend fishing for other fish species. For a given largemouth bass density, anglers spend less time fishing for largemouth bass in lakes that are stocked with walleyes than in those that are not. Largemouth bass prey heavily on stocked walleyes and reduce the overall survival of stocked juvenile walleyes. Increased walleye stocking may also act to increase largemouth bass populations. Walleye stocking also effects the successional status (maturity) of lakes. Increased angler effort acts to decrease maturity and walleye stocking acts to increase maturity. The decrease in maturity of lakes resulting from the expected increase in angler effort seems to outweigh increases due to stocking. Finally, given the tremendous investment in stocking infrastructure and the public's favorable view of stocking, stocking is likely to continue. It is important to determine the most appropriate stocking rate in terms of maximizing survival while minimizing economic expenditures. Using a Ricker stock-recruitment relationship, I demonstrate that the most appropriate stocking rate for small fingerling walleyes is 75 walleyes/ha. Complex changes in species abundance, angling effort, and community maturity result from walleye stocking and should be considered when establishing appropriate management goals and evaluating the necessity of stocking efforts.

ISBN: 0542040549Subjects--Topical Terms:

1017726
Biology, Ecology.

Walleye stocking in Wisconsin lakes: Species interactions, changes in angler effort, optimal stocking rates, and effects on community maturity.
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245 1 0 $a Walleye stocking in Wisconsin lakes: Species interactions, changes in angler effort, optimal stocking rates, and effects on community maturity.
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500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1263.
500 $a Supervisor: Timothy J. Ehlinger.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Milwaukee, 2005.
520 $a Fish stocking is common throughout the world. Reasons for stocking vary from preventing species extinction to increasing fishing opportunities for recreational anglers. Each year, many billions of fish are stocked in waters throughout the world; over one billion walleyes are stocked in North America alone. Understanding how stocked fish impact aquatic communities is critical given the large number of fish that are stocked into aquatic systems throughout the world. I used new and historic data sets to examine effects of walleye stocking on angler effort, species interactions, and community maturity. I also determined the stocking rate that maximizes walleye survival in Wisconsin lakes. The act of walleye stocking can alter angler effort independently from changes in population density. For a given density of walleyes, anglers spend a greater amount of time fishing for walleyes in lakes that are stocked than in those that are not. Similarly, walleye stocking can effect the amount of time anglers spend fishing for other fish species. For a given largemouth bass density, anglers spend less time fishing for largemouth bass in lakes that are stocked with walleyes than in those that are not. Largemouth bass prey heavily on stocked walleyes and reduce the overall survival of stocked juvenile walleyes. Increased walleye stocking may also act to increase largemouth bass populations. Walleye stocking also effects the successional status (maturity) of lakes. Increased angler effort acts to decrease maturity and walleye stocking acts to increase maturity. The decrease in maturity of lakes resulting from the expected increase in angler effort seems to outweigh increases due to stocking. Finally, given the tremendous investment in stocking infrastructure and the public's favorable view of stocking, stocking is likely to continue. It is important to determine the most appropriate stocking rate in terms of maximizing survival while minimizing economic expenditures. Using a Ricker stock-recruitment relationship, I demonstrate that the most appropriate stocking rate for small fingerling walleyes is 75 walleyes/ha. Complex changes in species abundance, angling effort, and community maturity result from walleye stocking and should be considered when establishing appropriate management goals and evaluating the necessity of stocking efforts.
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650 4 $a Biology, Ecology. $3 1017726
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710 2 0 $a The University of Wisconsin - Milwaukee. $3 1019345
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Ehlinger, Timothy J., $e advisor
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791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168206