Goldfish injected with14C-heptachlor (38.2 μg/44 g fish) eliminated about 18% of the dose in 10 days. Analyses of the fish at the end of 10 days revealed the presence of five compounds of which 91.2% was unchanged heptachlor and the remainder was heptachlor epoxide (5.4%), 1-hydroxychlordene (1.0%), 1-hydroxy-2,3-epoxychlordene (1.1%) and a conjugate (1.2%). The conjugate, on acid hydrolysis, yielded a product more polar than dihydroxyheptachlor, most likely a trihydroxy product. Analyses of feces and water showed the presence of only polar products.