Date of Award

Fall 1982

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Phillip R. Mundy

Committee Member

Chester E. Grosch

Committee Member

David E. Tyler

Call Number for Print

Special Collections LD4331.O35M375


Environmental conditions in the nursery areas during times of development affect the migratory behavior of the brown shrimp (Penaeus aztecus) by influencing growth and natural mortality. A linearized logistic model and a multiple linear model are used to relate environmental factors (week number, water temperature, salinity, air temperature, precipitation, net heating degree days, river discharge) to the cumulative proportion of catch and catch-per-unit-effort, respectively. Multiple regression analysis yielded equations containing the week number, the water temperature and an interaction term as the independent variables. Predictions of total annual yield and total annual catch-per-unit-effort are made using the migratory time density approach. The time factor, represented by week number, contributes the most in explaining the variation in the migratory timing. Although the models are not statistically precise, the empirical predictions are an improvement over existing estimators.


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