Are Marine Migrations of Striped Bass Genetically Pre-determined? : An investigation of Albemarle Sound-Roanoke River Striped Bass Migratory Patterns

ECU Author/Contributor (non-ECU co-authors, if there are any, appear on document)

Wesley S. Patrick (Creator)

Institution

East Carolina University (ECU )

Web Site: http://www.ecu.edu/lib/

Advisor

Edmund J. Stellwag

Abstract: Striped bass Morone saxatilis is one of the most thoroughly studied anadromous fish species in the United States with records governing the management of the species dating back to the late 1600s. However management of this species has been difficult because of the species' anadromous behavior that takes it between fresh and marine waters crossing numerous geopolitical boundaries. In the 20th century the fishery experienced two dramatic declines in abundance. Studying the fishery after the declines resulted in major advancements in scientific understanding and management for this species and striped bass is now an example of a successfully rebuilt fishery key questions about population dynamics and migration patterns still persist. These unanswered questions reduce confidence in managing the species as a whole and instead encouraging precautionary measures applied to small geographic areas such as a natal river. This dissertation begins with a thorough review of the history of striped bass including the key scientific findings and management measures instrumental in its recent recovery. Chapter 2 explores how scientists have approached the major challenge in striped bass management: defining the management unit so allocations can be made fairly and sustainably. The array of genetic techniques that have been employed their limitations and the populations studied with those techniques is reviewed. Among the studies reviewed is one suggesting North Carolina striped bass migration may be genetically linked; this suggestion forms the basis for this dissertation's hypothesis. Answering this question can help resource managers better understand population dynamics genetic interplay and migration patterns - important for creating effective management and fair allocation between states. Chapter 3 explores the biotic and abiotic factors that can influence the results of an otolith microchemistry analysis and Chapter 4 contains the discussion of the findings about the 112 striped bass examined. With biases accounted for this dissertation concludes that marine migration was not linked to the genes examined. However an interesting post-hoc observation can be made: though the behavior was not found to be genetically linked striped bass in the first year of life proved to be residents stagers or sprinters with different growth rates associated with these behaviors. 

Additional Information

Publication

Dissertation

Date: 2011

Keywords

Natural resource management, Ecology, Genetics

Subjects

Striped bass--North Carolina--Albemarle Sound

Striped bass--Roanoke River (Va. and N.C.)

Fish populations--North Carolina

Fishes--Migration--North Carolina

Fishery management--North Carolina

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