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A Comparison of Hydraulic Patent Ton...

Wheat-Walsh, Margaret.

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A Comparison of Hydraulic Patent Tongs and Oyster Dredges for Monitoring Oyster Reefs in the Mission - Aransas Estuary.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A Comparison of Hydraulic Patent Tongs and Oyster Dredges for Monitoring Oyster Reefs in the Mission - Aransas Estuary./
Author:	Wheat-Walsh, Margaret.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	96 p.
Notes:	Source: Masters Abstracts International, Volume: 85-03.
Contained By:	Masters Abstracts International85-03.
Subject:	Ecology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30571639
ISBN:	9798380340922

A Comparison of Hydraulic Patent Tongs and Oyster Dredges for Monitoring Oyster Reefs in the Mission - Aransas Estuary.
Wheat-Walsh, Margaret.

A Comparison of Hydraulic Patent Tongs and Oyster Dredges for Monitoring Oyster Reefs in the Mission - Aransas Estuary. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 96 p.

Source: Masters Abstracts International, Volume: 85-03.

Thesis (M.Sc.)--Texas A&M University - Corpus Christi, 2023.

This item must not be sold to any third party vendors.

The Texas Parks and Wildlife Department (TPWD) currently uses dredge sampling to monitor oyster reefs open to commercial harvest. However, dredges have been shown to produce biased sampling data with regard to the density and relative sizes of the oysters collected. In this project, we compared the sampling performance of oyster dredges in reference to hydraulic (patent) oyster tongs. The objectives of this project were to: (1) Compare the density (n m-2 ) and size (shell height, mm) of live oysters, articulated shells of dead oysters (boxes), and disarticulated oyster shells collected using dredges and tongs across varying reef structures (assessed with acoustic mapping procedures). (2) Compare dredge vs. tong-generated metrics and evaluate resulting thresholds for opening and closing oyster harvest areas. (3) Compare the logistics of dredge versus tong sampling methods for oyster monitoring (e.g., cost, gear maintenance and operation, impacts on staff-hours). Results indicate that dredges show a size bias toward larger shells and oysters, while tongs sample a smaller area and may not accurately represent density across the entire reef extent, particularly for reefs with patchy oyster distribution and where sample size is not adequate. Although deployment, retrieval, and processing for one tong sample takes less time than for one dredge sample, tong sampling requires one additional staff member and approximately 2-3x more samples to see stabilized estimates of density, compared to dredge sampling. Based on this study, tongs may be better suited for more focused (spatially or temporally) sampling initiatives where a greater number of samples and staff time are more realistic. This is the first tong and dredge comparison in Texas estuaries that focuses on monitoring commercially harvested oyster reefs and understanding the ability of tongs and dredges to provide management metrics across a range of reef types and oyster abundances.

ISBN: 9798380340922Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Oyster dredges

A Comparison of Hydraulic Patent Tongs and Oyster Dredges for Monitoring Oyster Reefs in the Mission - Aransas Estuary.
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245 1 2 $a A Comparison of Hydraulic Patent Tongs and Oyster Dredges for Monitoring Oyster Reefs in the Mission - Aransas Estuary.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 96 p.
500 $a Source: Masters Abstracts International, Volume: 85-03.
500 $a Advisor: Beseres Pollack, Jennifer;Olsen, Zachary.
502 $a Thesis (M.Sc.)--Texas A&M University - Corpus Christi, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a The Texas Parks and Wildlife Department (TPWD) currently uses dredge sampling to monitor oyster reefs open to commercial harvest. However, dredges have been shown to produce biased sampling data with regard to the density and relative sizes of the oysters collected. In this project, we compared the sampling performance of oyster dredges in reference to hydraulic (patent) oyster tongs. The objectives of this project were to: (1) Compare the density (n m-2 ) and size (shell height, mm) of live oysters, articulated shells of dead oysters (boxes), and disarticulated oyster shells collected using dredges and tongs across varying reef structures (assessed with acoustic mapping procedures). (2) Compare dredge vs. tong-generated metrics and evaluate resulting thresholds for opening and closing oyster harvest areas. (3) Compare the logistics of dredge versus tong sampling methods for oyster monitoring (e.g., cost, gear maintenance and operation, impacts on staff-hours). Results indicate that dredges show a size bias toward larger shells and oysters, while tongs sample a smaller area and may not accurately represent density across the entire reef extent, particularly for reefs with patchy oyster distribution and where sample size is not adequate. Although deployment, retrieval, and processing for one tong sample takes less time than for one dredge sample, tong sampling requires one additional staff member and approximately 2-3x more samples to see stabilized estimates of density, compared to dredge sampling. Based on this study, tongs may be better suited for more focused (spatially or temporally) sampling initiatives where a greater number of samples and staff time are more realistic. This is the first tong and dredge comparison in Texas estuaries that focuses on monitoring commercially harvested oyster reefs and understanding the ability of tongs and dredges to provide management metrics across a range of reef types and oyster abundances.
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650 4 $a Ecology. $3 516476
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Marine geology. $3 3173821
653 $a Oyster dredges
653 $a Oyster reefs
653 $a Acoustic mapping
653 $a Management metrics
690 $a 0329
690 $a 0556
690 $a 0792
710 2 $a Texas A&M University - Corpus Christi. $b Marine Biology Program. $3 3546263
773 0 $t Masters Abstracts International $g 85-03.
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791 $a M.Sc.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30571639