Figure 3. — Containers used to culture shrimp larvae for experimental studies. 



-Nutrients which sustained the highest growth of diatoms each 

 month, 1966-67 



y NP 



3/ 



'3- 

 no data. 



Fe = FeNH3(S04)2. 



Light response was an individual matter in 

 all stages. At a given intensity, some larvae 

 were attracted toward the light and others 

 were not. As intensity increased, the larvae 

 did not move away en masse; a few responded 

 to each increase until finally all were repelled. 



During this experiment, we recorded the 

 rate of movement of selected larval stages 

 toward a low-intensity light source (table 5). 

 The rate of movement of myses wasnotnneas- 

 ured because they did not swim directly to- 

 ward the light source as did the nauplii and 

 protozoeae. 



Harry L. Cook, Project Leader 



CULTIVATION OF SHRIMP IN 

 ARTIFICIAL PONDS 



We used white shrimp in our brackish- 

 water, pond culture studies during the summer 

 of 1966. Postlarval shrimp were obtained from 

 stock spawned and reared through the larval 



