Date of Award

Summer 1979

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Ray S. Birdsong

Committee Member

Ronald E. Johnson

Committee Member

Harold G. Marshall

Committee Member

Herbert M. Austin

Call Number for Print

Special Collections LD4331.O35L466


The ichthyoplankton of Hempstead Bay estuary was sampled from December 1972 to mid March 1974. Eleven stations were sampled by towing a 0.5 meter diameter plankton net. Eggs were most abundant during June and July with an average concentration calculated to be above 5,500/100m3. Egg densities were the lowest during the fall and winter. Larvae were most frequently taken from March through July with densities varying greatly among the samples. The eggs of Brevoortia tyrannus, Anchoa mitchilli, Tautoga onitis, Tautogolabrus adspersus, and Scophthalmus aguosus and the larvae of Menidia menidia, Ammodvtes hexapterus and Pseudopleuronectes americanus constituted most of the ichthyoplankton. Most species were found within a wide temperature range, while the salinity range found in the estuary was relatively narrow and restricted spawning to those species tolerating near coastal salinities. Zooplankton densities (excluding ctenophores and ”jellyfish”) were high except during the summer months. During the late summer ctenophore- "jellyfish" bloom) densities of ichthyoplankton and zooplankton were low.


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