Table 6. Maximum acceptable toxicant concentration (MATC) values for Aroclor 

 PCBs and selected species of aquatic organisms, based on exposure for life 

 cycle, partial life cycle, or early life stage (from EPA 1980). 



Ecosystem, organism, MATC 



Aroclor PCB (ug/1 ) 



Freshwater 



Cladoceran, Daphnia magna 



1248 1.2-3.5 



1254 2.5-7.5 

 Amphipod, Gammarus pseudol imnaeus 



1242 2.8-8.7 



1248 2.5-5.1 



Insect (midge), Tanytarsus dissimilis 



1254 0.5-1.2 

 Brook trout, Salvelinus fontinalis 



1254 0.7-1.5 



Fathead minnow, Pimephales promelas 



1242 5.4-15.0 



1248 0.1-0.4 



1254 1.8-4.6 



1260 1.3-4.0 



Marine 



Sheepshead minnow, Cyprinodon variegatus 

 Early life stage 



1016 3.4-15.0 



1254 0.06-0.16 



^Lower value in each pair indicates highest concentration tested producing 

 no measurable effect on growth, reproduction, survival, and metabolic upset 

 during chronic exposure; higher value indicates lowest concentration 

 tested producing a measurable effect. 



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