DDT Residues in Benthic Invertebrates and Demersal Fish in St. Margaret’s Bay, Nova Scotia

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Abstract
Organochlorine residues (p,p′-DDT and its metabolites) were measured in samples of benthic invertebrates and demersal fish taken from St. Margaret’s Bay, Nova Scotia. No other organochlorine compounds were present in detectable amounts. ΣDDT levels in whole organisms, excluding lipid-rich tissues, grouped as benthic epifauna, infauna, and demersal fish were not significantly different and thus no accumulation occurs in this food chain. Atmospheric supply is probably the major source of low levels of contamination and a detritus-based food web may equalize residue concentration between various feeding types.

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