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Determination of conversion factors for vessel comparison studies
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2009
[PDF-1.05 MB]
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Alternative Title:Vessel comparison studies
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Description:"NOAA's Northeast Fisheries Science Center has conducted groundfish surveys on the Northeast Continental Shelf of the United States in autumn since 1963. These surveys are used to compute relative abundance indices of fish and selected invertebrates. Since the inception of the survey program, the R/V Albatross IV has been the primary vessel conducting the work, except periodically when the R/V Delaware II has been utilized because the R/V Albatross IV was not available. When the R/V Delaware II was used, differences in vessel characteristics necessitate the development of conversion coefficients to adjust catch rates using the R/V Albatross as the standard. A series of vessel calibration studies between the R/Vs Albatross IV and Delaware II employing a paired tow design were initiated in 1981. In 1997, the R/V Delaware II underwent a major refit. Accordingly, for these two research vessels, there are two variations in the experimental time series that require consideration in development of calibration coefficients. We explored the use of a ratio estimator for the development of a vessel conversion coefficient and compared these with a general linear model (GLM) approach used by Byrne and Forrester (1991)"--Page iv.
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Content Notes:by Henry O. Milliken and Michael J. Fogarty.
"Print publication date April 2009; web version posted May 13, 2009"--Publication's home page.
"April 2009."
Mode of access: World Wide Web.
System requirements: Adobe Acrobat Reader.
Includes bibliographical references.
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Rights Information:Public Domain
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Compliance:Library
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