Date of Award

Summer 1980

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Anthony J. Provenzano

Committee Member

Phillip R. Mundy

Committee Member

John R. Holsinger

Call Number for Print

Special Collections LD4331.O35M63


The effects of elevated CaCl2 , MgCl2 , combination CaCl2 and MgCl2 concentrations and their associated ionic strengths on larval growth and survival of the freshwater prawn, Macrobrachium rosenbergii were investigated in the laboratory. Larvae were reared in diluted seawater of 15 parts per thousand salinity with elevated calcium concentrations of 330 parts per million and elevated magnesium concentrations of 1275 parts per million. Control larvae were also reared with elevated NaCl concentrations to duplicate the ionic strength increases of the combination CaCl2 - MgCl2 test solution which had the highest ionic strength. A constant temperature of 29°C was used for all larval rearing.

There is no correlation between larval growth and the treatments that the larvae were subjected to. No interbrood growth variation was evident in any of the treatments. Larval survival was inversely related to ionic strength except for the CaCl2 - MgCl2 treatments. Significant interbrood variation exists with respect to larval survival times in all treatments.


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