Organochlorine and Mercury Residues in Canvasback Duck Eggs, 1972-73

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Abstract
Eggs of canvasback ducks (Aythya valisineria) from several major breeding areas were analyzed for organochlorine and Hg residues. Polychlorinated biphenyls (PCB) were detected in 96 of 97 eggs, in concentrations up to 29 ppm (wet wt). DDE occurred in 79% of the samples with a maximum residue of 12 ppm (wet wt). DDT, DDD, dieldrin, hexachlorobenzene, cis-chlordane, heptachlor epoxide and oxychlordane were detected less frequently. Hg was detected in only 6 of 34 eggs analyzed. Most of the eggs contained concentrations of organochlorines and Hg below levels known to cause adverse effects on avian survival or reproduction.

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