60 



50 



40 



^ 30 



3 20 



O 



^ 10 



25 X 



CONTROL 



40 



80 



1 20 



160 



200 



DAYS OF EXPOSURE TO DDE & PCBs 



Figure 2. Mortality of fry of Lake Michigan lake trout exposed to 



DDE and PCBs at concentrations simulating those found in water 



and plankton of Lake Michigan (Ix) and at concentrations 5 



and 25 times higher. 



81 



