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Investigation of Channel Catfish and...

Harty, Cole R.

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Investigation of Channel Catfish and Blue Catfish Population Dynamics in Three Tennessee River Reservoirs.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigation of Channel Catfish and Blue Catfish Population Dynamics in Three Tennessee River Reservoirs./
Author:	Harty, Cole R.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	69 p.
Notes:	Source: Masters Abstracts International, Volume: 57-05.
Contained By:	Masters Abstracts International57-05(E).
Subject:	Biology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10621329
ISBN:	9780355702026

Investigation of Channel Catfish and Blue Catfish Population Dynamics in Three Tennessee River Reservoirs.
Harty, Cole R.

Investigation of Channel Catfish and Blue Catfish Population Dynamics in Three Tennessee River Reservoirs. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 69 p.

Source: Masters Abstracts International, Volume: 57-05.

Thesis (M.S.)--Tennessee Technological University, 2017.

Catfish are important components of commercial and recreational fisheries in several Tennessee reservoirs. However, catfish have received scant attention because they were not classified as sport fish in Tennessee until 2007. The lack of knowledge regarding catfish populations and how to effectively sample them presents many research opportunities. The objectives of this study were to evaluate catfish sampling protocols in three Tennessee reservoirs, estimate growth and longevity, mathematically model yields and the potential for growth overfishing of Channel Catfish, and mathematically model the abundance of trophy Blue Catfish under different maximum size limits. A variety of gears were deployed seasonally in 2015 and subsamples of each species were aged using lapilli otoliths. Ages were assigned to unaged fish using an age-length key. In 2015, tandem hoop nets collected more than 3,700 Channel Catfish across spring, summer, and fall seasons in three Tennessee reservoirs. Catch per unit effort was consistently high (27.5-38.6 fish/series) in all study reservoirs during spring sampling. Channel Catfish grew faster in Kentucky Lake and Chickamauga Lake, which both support substantial catfish fisheries; whereas, fish in Ft. Loudoun Lake, a system with a commercial harvest ban and little recreational harvest, grew slower, but lived much longer (age 21 versus ages 12-15). Annual mortality (A) ranged from 61.1% in Kentucky Lake to 26.9% in Chickamauga Lake and 17.7% in Ft. Loudoun Lake. Yield modeling showed potential for growth overfishing at high levels of exploitation, but suggested minimum length limits could ameliorate such problems. Low-frequency electrofishing was less effective at capturing Blue Catfish than what has been observed in other studies. Because the number of Blue Catfish collected with low-frequency electrofishing was small (n=230), several other gears were used to supplement samples (trotlines, n = 210; hoop nets, n = 126; gill nets, n = 9; angling, n = 5). Blue Catfish exhibited trends similar to Channel Catfish. Growth was faster in Kentucky Lake and Chickamauga Lake; whereas, fish lived much longer (age 37 versus ages 17-18) in Ft. Loudoun Lake. The number of trophy fish (> 914 mm total length [TL]) in the population was modeled under two scenarios: (1) the current regulation allowing harvest of one Blue Catfish over 864 mm TL per day; and (2) the proposed regulation allowing for no harvest of Blue Catfish over 914 mm TL. Modeling suggested that changing the current regulation to the proposed regulation could significantly reduce the number of trophy Blue Catfish in those populations.

ISBN: 9780355702026Subjects--Topical Terms:

522710
Biology.

Investigation of Channel Catfish and Blue Catfish Population Dynamics in Three Tennessee River Reservoirs.
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520 $a Catfish are important components of commercial and recreational fisheries in several Tennessee reservoirs. However, catfish have received scant attention because they were not classified as sport fish in Tennessee until 2007. The lack of knowledge regarding catfish populations and how to effectively sample them presents many research opportunities. The objectives of this study were to evaluate catfish sampling protocols in three Tennessee reservoirs, estimate growth and longevity, mathematically model yields and the potential for growth overfishing of Channel Catfish, and mathematically model the abundance of trophy Blue Catfish under different maximum size limits. A variety of gears were deployed seasonally in 2015 and subsamples of each species were aged using lapilli otoliths. Ages were assigned to unaged fish using an age-length key. In 2015, tandem hoop nets collected more than 3,700 Channel Catfish across spring, summer, and fall seasons in three Tennessee reservoirs. Catch per unit effort was consistently high (27.5-38.6 fish/series) in all study reservoirs during spring sampling. Channel Catfish grew faster in Kentucky Lake and Chickamauga Lake, which both support substantial catfish fisheries; whereas, fish in Ft. Loudoun Lake, a system with a commercial harvest ban and little recreational harvest, grew slower, but lived much longer (age 21 versus ages 12-15). Annual mortality (A) ranged from 61.1% in Kentucky Lake to 26.9% in Chickamauga Lake and 17.7% in Ft. Loudoun Lake. Yield modeling showed potential for growth overfishing at high levels of exploitation, but suggested minimum length limits could ameliorate such problems. Low-frequency electrofishing was less effective at capturing Blue Catfish than what has been observed in other studies. Because the number of Blue Catfish collected with low-frequency electrofishing was small (n=230), several other gears were used to supplement samples (trotlines, n = 210; hoop nets, n = 126; gill nets, n = 9; angling, n = 5). Blue Catfish exhibited trends similar to Channel Catfish. Growth was faster in Kentucky Lake and Chickamauga Lake; whereas, fish lived much longer (age 37 versus ages 17-18) in Ft. Loudoun Lake. The number of trophy fish (> 914 mm total length [TL]) in the population was modeled under two scenarios: (1) the current regulation allowing harvest of one Blue Catfish over 864 mm TL per day; and (2) the proposed regulation allowing for no harvest of Blue Catfish over 914 mm TL. Modeling suggested that changing the current regulation to the proposed regulation could significantly reduce the number of trophy Blue Catfish in those populations.
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