FISHERY BULLETIN: VOL. 76, NO. 2 



FIGURE 4. — Percent cumulative mor- 

 tality of newly hatched Pacific herring 

 larvae continuously exposed to copper 

 (micrograms per liter). Mortality curves 

 shown are the fitted logit curves used to 

 establish median lethal times. 



4-> 



c 



Q) 

 O 



S- 

 0) 

 Q. 





■4-> 



S- 



o 



> 



+-> 



o 



^■a n I n I D u °i — \j^ 



<0^^=^^ 



Control 

 J \ \ I 



30 60 90 120 150 180 210 240 270 300 



_J Yolk sac L 

 absorbtion ^ 



Hours from hatching 



o 





-M 



S- 



o 



o 



o 



E 



240 

 192 



144k 

 96 



24 



10 



T — r 



^--1- Hatching completed -^- 



■1- 



Initiation of 



yolksac 



absorption 





EMBRYOS 

 A=LC5o 



A = LT50 ± 95% confidence limits 



LARVAE 

 D = LC50 



 = LT50 ^ 95% confidence limits 



J L 



10 



20 30 



50 



1000 



100 300 



Copper - pg/£ 



Figure 5. — Toxicity curves for Pacific herring embryos and larvae continuously exposed to copper. 



3000 



352 



