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

Record Type:	Language materials, manuscript : 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.
Description:	1 online resource (96 pages)
Notes:	Source: Masters Abstracts International, Volume: 85-03.
Contained By:	Masters Abstracts International85-03.
Subject:	Ecology. -
Online resource:	click for full text (PQDT)
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. - 1 online resource (96 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380340922Subjects--Topical Terms:

575279
Ecology.
Subjects--Index Terms:

Oyster dredgesIndex Terms--Genre/Form:

554714
Electronic books.

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