Date of Award

Fall 1976

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Anthony J. Provenzano

Committee Member

Harold G. Marshall

Committee Member

John C. Ludwick

Committee Member

George C. Grant

Call Number for Print

Special Collections LD4331.O35G69


Planktonic stages or 45 genera and species or decapod larvae were identified and staged from samples taken over a three year period in the lower portion and entrance area or Chesapeake Bay. The distribution of each larval stage of the decapod crustaceans found in the bay was determined and from this, the extent of the respective breeding season was deduced. In 1975, samples were taken monthly from stations along a transect at the baymouth, both at the surface and bottom. Two stations were also occupied over the tidal cycle in daylight and darkness. Evidence is presented that larvae of some typically offshore decapods can be retained in the estuary. Larvae tended to occur in the bottom layers the majority of the times, thereby being retained within the estuary. Results from the overnight stations showed the larvae underwent a greater vertical migration in response to tidal flow than in response to changes in illumination.


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