100- 



< 80 



o 



X 



I- 

 cr 



UJ 

 Q. 



60 



(A 



I- 



cc40 



< 



Q. 



20 



6 



DAYS 



8 



10 



12 



Figure 1» -—Effects of increasing concentration of crude oil mixed 

 with oarbonired sand on the survival of toadfish embryos. The 

 survival time in days is plotted against the concentration in parts 

 per thousand. The open circle curve corresponds to the time of the 

 first death, the dark circle to the time required to kill all embryos. 



