Control 



> 



c 

 > 

 > 



E 



3 

 Z 



2 

 DAYS 



Figure 5. Survival (by days) of stone crab larvae in petroleum oil solutions, com- 

 pared with a control. The number on the curves refer to dilutions of oil-stock solution 

 (No. 2 fuel oil. API). 



Louisiana crude is relatively non-toxic, Venezuelan crude more so, 

 whereas No. 2 fuel oil and automotive oils are very toxic. Levels at 

 which toxicities appear in acute experiments with No. 2 fuel are about 

 0.2 to 0.7 ppm. Toxicity increases with concentration and duration of 



34 



