Predicting toxicities of substituted aromatic hydrocarbons to fish by toxicities toDaphnia MagnaorPhotobacterium Phosphoreum1

Relationships between toxicities of substituted aromatic hydrocarbons to Daphnia magna and to Fathead minnows or Photobacterium phosphoreum were studied based on structure‐activity equations we established. Good relationships between toxicities of chemicals to Daphnia magna and to Fathead minnows, Photobacterium phosphoreum were found for a wide range of chemicals. The toxicity data of fish can be predicted by the toxicity data of Daphnia magna or Photobacterium phosphoreum. It is probable that the toxicities of chemicals to the three organisms are similar.