KEY 



Sewage discharged direclly 

 into coastal waters 



O less than 4 MGD 

 (J 15-41 MGD 

 # 100-400 MGD 



Figure 4 . 



Prevalences of two diseases — black gill disease 

 and shell disease -- in Massachusetts lobsters - 

 1983 and 1984. Locations of major sewage 

 discharges are also indicated. (From Estrella, 

 1984) . 



15 



