Biological Magnification and Degradation of DDT and Aldrin by Freshwater Invertebrates

Magnification of persistent pesticides by invertebrates occurred rapidly in fresh water. Invertebrates accumulated residues many thousands of times that of surrounding water after exposure to 14 C-labeled aldrin or DDT at levels < 100 pptr (ng/liter). In addition, evidence of marked degradation of these pesticides within specific trophic levels was found. Our studies suggest that aquatic invertebrates influence both the quantity and quality of insecticide residue passed via the fish food chain.