Maximum levels of DDTs in whole carp and carp muscle were 161 and 87 ng/g, respectively therefore, the levels of DDTs observed in carp in this study were insufficient to constitute a health concern if present in fish for human consumption. The largest mass distribution of DDTs was also in gill, followed by muscle and gastrointestinal tract. The carp organ with the highest concentrations of DDTs (DDT, DDD and DDE) was the gill. Unimodal or bimodal distributions were observed, and the concentrations of DDT metabolites (DDD and p,p’-DDE) increased over time. The bioaccumulation and elimination of DDT differed in T.

Tissue/organ distributions of DDTs were also investigated in carp.

The accumulation, elimination and toxic effects of DDT (p,p’-DDT, o,p’-DDT), and its metabolites DDD (p,p’-DDD, o,p’-DDD) and DDE (p,p’-DDE, o,p’-DDE) were studied in T. Microcosms containing DDT spiked-sediment, Tubifex tubifex and carp ( Cyprinus carpio) were constructed to simulate a freshwater system.

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