Date of Award

Fall 1981

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Phillip R. Mundy

Committee Member

David F. Felgenbaum

Committee Member

Chester E. Grosch

Call Number for Print

Special Collections LD4331.O35 B31


A quantitative description of the migratory behavior of the brown shrimp, Penaeus aztecus, was established using the density approach. A theoretical time density was estimated by the proportion of catch and catch per boat hour NOAA-NMFS fisheries statistics collected in Pamlico Sound, the Neuse River, and Core Sound. A clear quantitative description of brown shrimp migratory timing is found in the time densities. The impact of various physical tactors on the progress of the fishery in time and space can be objectively evaluated by using the time density statistics as dependent variables in modeling efforts. The distributions also enable one to compare characteristics of each weekly catch or catch/bhr between years and between areas to reveal the progress of the fishery in time and space. Time density distributions based on CPUL could be used to bring the fishery closer to "optimum utilization" by providing a quantitative measure of catch/bhc through time. Comparisons of distributions of a single species to distributions of all species combined provided a useful method for measuring the impact of exploitation the of one species on the other species. The time density approach also functions to demonstrate the relative practical utility of information from monthly, weekly, or daily averages of Catch or catch/bhr. Finally, the time density technique has been shown to be an improved method of predicting total yield even during years of apparently aberrant environmental factors. This analysis has provided a number of insights into migratory timing of bro n shrimp which could be of importance to fisheries management.


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