Factors Influencing the Mortality and Distribution of Subadult Red Drum in North Carolina

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dc.contributor.advisor Louis B. Daniel, III, Committee Member en_US
dc.contributor.advisor James F. Gilliam, Committee Member en_US
dc.contributor.advisor Kenneth H. Pollock, Committee Member en_US
dc.contributor.advisor Joseph E. Hightower, Committee Co-Chair en_US
dc.contributor.advisor Jeffrey A. Buckel, Committee Co-Chair en_US
dc.contributor.author Bacheler, Nathan Mitchell en_US
dc.date.accessioned 2010-04-02T19:16:03Z
dc.date.available 2010-04-02T19:16:03Z
dc.date.issued 2008-08-13 en_US
dc.identifier.other etd-07292008-115158 en_US
dc.identifier.uri http://www.lib.ncsu.edu/resolver/1840.16/5573
dc.description.abstract Subadult red drum Sciaenops ocellatus are ecologically and economically important in North Carolina, but little is known about factors influencing their mortality and distribution in estuaries. I first assessed the effect of fishing on red drum abundance using 24 years of tagging data. The tag-return model incorporated all first returns from fish caught-and-released and accounted for age-dependent selectivities that varied by fate of the fish. Estimated fishing mortality rates (F) were high and variable before regulation changes in 1991, but decreased in magnitude and variability after 1991. A dome-shaped selectivity pattern was estimated to account for migration of older fish into coastal waters. To quantify the natural mortality rate and seasonal Fs for red drum, I conducted the first field test of a combined telemetry – tag return approach. Estimated Fs were similar in seasonal pattern and magnitude between tagging and telemetry, but joint estimates were influenced primarily by tagging. Natural mortality rate was low and influenced primarily by telemetry. The combined approach provides a new tool to estimate mortality rates for myriad fish species. Next, habitat use of subadult red drum was quantified with a combination of fishery-independent sampling, telemetry, and generalized additive models. At a large scale, red drum were associated with shallow, nearshore waters, sometimes with seagrass. To determine the influence of prey, I examined red drum stomachs and used generalized additive models to relate physicochemical and prey attributes to telemetered red drum at a small scale. Telemetered red drum were negatively related to salinity and positively related to dissolved oxygen and total prey. Last, I used tagging and telemetry to quantify the large- and small-scale movements of subadult red drum. Movement rates and directions were influenced by age of fish and region and season of tagging, and suggest that the spatial scale of management and regulations currently employed in North Carolina are appropriate. Tagging and fishery-independent surveys have provided valuable information to improve red drum management. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Red drum en_US
dc.subject mortality en_US
dc.subject Sciaenops ocellatus en_US
dc.subject habitat use en_US
dc.subject movement en_US
dc.subject telemetry en_US
dc.subject tagging en_US
dc.subject survival en_US
dc.title Factors Influencing the Mortality and Distribution of Subadult Red Drum in North Carolina en_US
dc.degree.name PhD en_US
dc.degree.level dissertation en_US
dc.degree.discipline Zoology en_US

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