reared at 18° C. (64.4° F.) and 21° C. (69.8° 

 F,) died during the molt to first protozoeae; 

 first postlarval stage was reached in 15 days 

 at 24° C. (75.2° F.), in 12 days at 27° C. 

 (80.6 F,), and in 11 days at 30° C. (86.0° F.). 

 Six different organisms were tested as food 

 for Trachypeneus similis larvae, with Skele- 

 tonenna species as a control. Gymnodinium 



splendens gave the best survival; the Dunaliella 

 species and Thalas si osira species, and a 

 Euglenoid all gave better survival than 

 Skeletonema ; and two unidentified dinoflagel- 

 lates gave poorer survival. 



Harry L. Cook, Project Leader 



1 METERING PUMP 



2 DIATOM CULTURE 



3 MAGNETIC STIRRER 



4 AIR PUMP 



5 CRUSHED OYSTER SHELL FILTER 



6 PUMP 



7 PLANKTON SCREEN 



8 AIR STONE 



9 LIGHT 



10 lOO-LITER FIBERGLASS AQUARIUM 



Figure 6. — Filtering system for mass culturing of penaeid larvae. 



+ 8 +10 +12 +14 



DAYS AFTER HATCHING 

 Figure 7. — Average larval stage of brown shrimp at a given time. 



13 



H6 



-18 



♦ 20 



