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dc.contributor.authorHomer, Michael Daryll
dc.date.accessioned2014-03-04T20:24:16Z
dc.date.available2014-03-04T20:24:16Z
dc.date.issued2011-12
dc.identifier.otherhomer_michael_d_201112_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/homer_michael_d_201112_ms
dc.identifier.urihttp://hdl.handle.net/10724/27733
dc.description.abstractData from annual gillnetting surveys were used to determine sizes, age structure, and relative growth of an introduced population of blue catfish in Lake Oconee, Georgia. Age and back-calculated growth were estimated with three determination-techniques and compared for precision. Blue catfish catch increased from 1997 to 2009; there was a concurrent decline in catch of native white catfish. Blue catfish ages ranged from 1 to 8 years old (mean=3.7 years, SD=1.4 years) and annual relative growth was 86.1 mm (SD=36.1 mm). Age assignment-precision was highest for otoliths (83.5%) and lowest for basal recesses (71.4%). Mean back-calculated total lengths were significantly variable among fish from ages 1-3 for each technique compared. Otoliths produced smaller estimates for mean total length from ages 1-6. The blue catfish population in Lake Oconee is relatively young and individuals are growing rapidly; otoliths and articulating processes of pectoral spines suffice for blue catfish age determination.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectInvasive
dc.subjectGrowth
dc.subjectback-calculation
dc.subjectGillnets
dc.subjectIctaluridae
dc.titleAge and size structure for an introduced population of blue catfish (Ictalurus furcatus) in Lake Oconee, Georgia and a comparison of age determination techniques
dc.typeThesis
dc.description.degreeMS
dc.description.departmentDaniel B. Warnell School of Forestry and Natural Resources
dc.description.majorForest Resources
dc.description.advisorCecil A. Jennings
dc.description.committeeCecil A. Jennings
dc.description.committeeDouglas Peterson
dc.description.committeeBrett Albanese


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