Bioconcentration of 2,3,7,8-Tetrachlorodibenzo-p-dioxin TCDD

Recently, Lassiter and Hallam [189] proposed the survival of fattest model , which means that organisms with higher body fat/lipid content will survive longer, since they are more resistant to toxic effects of lipophiHc chemicals than organisms with lower lipid content. Our results confirm and corroborate this hypothesis of the fattest model proposed by Lassiter and Hallam [189]. 

Different research groups have determined the bioconcentration of OCDD in various fish species. Wet weight bioconcentration factors (BCF ) of OCDD in various fish species were compiled by Geyer et al. [201,202] from recent papers. Only steady-state BCF data obtained in flow-through systems were considered. For comparison, BCF values were transformed in BCFl values. Table 10 contains body weights, lipid contents, BCFl values, and corresponding ambient OCDD concentrations. In order to assess the most likely BCFl (ambient OCDD concentrations water solubility), experimental BCFl data of OCDD were plot- 

Eish species Mean body weight (g) Lipid content (%) Ambient OCDD cone. C v (Pg 1 ) Bio concentration Eactor References 

Source Taken with modifications from Geyer et al. [201,202], 

Assumed average lipid content (% on a wet weight basis) of fish. Water solubility of OCDD. 

---