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Growth, spawning and habitat use of catfishes in the Delaware River Estuary
Descriptive
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Text
TitleInfo
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Title
Growth, spawning and habitat use of catfishes in the Delaware River Estuary
SubTitle
PartName
PartNumber
NonSort
Identifier
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ETD_2372
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10005600001.ETD.000052179
Language
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eng
Genre
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theses
Subject
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(authority = RUETD)
Topic
Biology
Subject
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(authority = ETD-LCSH)
Topic
Catfishes--Habitat--Delaware River Estuary
Abstract
In the Delaware River estuary, native white catfish (Ameiurus catus Linnaeus 1758) have appeared to decline as the introduced channel catfish (Ictalurus punctatus Rafinesque 1818) has become more abundant. To determine the current status of these populations and the habitats they use, we surveyed four zones of the Delaware River estuary from April to November, 2007. Hoop nets (N=497) were set in mainstem river, lower tributary, and middle tributary habitats. Upper tributary habitats near the head-of-tide were angled. Our findings indicated that the ratio of channel catfish to white catfish was much less than documented in the early 1990’s. Channel catfish and white catfish were found throughout the study area, during all seasons. Channel catfish and white catfish catch-per-net-night (CPNN) increased significantly from spring to fall. ANOVA of white catfish CPNN revealed a significant two-way interaction indicating movement downstream and into the lower estuary during the fall. Both species had unstable age structures indicating variable recruitment. Variable recruitment may account for past differences in ratios of channel catfish to white catfish. Channel catfish in this study lived longer (22 years) when compared to channel catfish collected in other nearby river systems. This difference may be a function of comparing otolith ages (in this study) with age maxima determined by spines and other techniques known to underestimate the age of old catfishes. Few brown bullhead and no yellow bullhead or flathead catfish were collected.
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electronic resource
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x, 118 p. : ill.
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Note
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M.S.
Note
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Includes bibliographical references (p. 113-118)
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by David H. Keller
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Keller
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David H.
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1980-
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David H. Keller
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Dighton
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John
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chair
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Advisory Committee
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John Dighton
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Morgan
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Mark
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internal member
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Advisory Committee
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Mark Morgan
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Horwitz
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Richard
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Advisory Committee
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Richard Horwitz
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Rutgers University
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degree grantor
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Camden Graduate School
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school
OriginInfo
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2010
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2010-01
Place
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xx
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Title
Rutgers University Electronic Theses and Dissertations
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ETD
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Title
Camden Graduate School Electronic Theses and Dissertations
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rucore10005600001
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doi:10.7282/T3RX9C7B
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ETD graduate
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Rights
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The author owns the copyright to this work.
Copyright
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Copyright protected
Notice
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Open
Reason
Permission or license
Note
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Name
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Keller
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David
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DateTime
2010-01-03 20:44:09
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David Keller
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Rutgers University. Camden Graduate School
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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1628160
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