Abstract
During the period from April to May 1990, 18 swans (Cygnus spp.) and 80 wild geese (Anser albifrons) were found emaciated or dead because of lead-poisoning caused by ingestion of lead shots at Lake Miyajima in Hokkaido. Twenty-seven wild geese, four Whooper Swans (C. cygnus cygnus), and two Bewick's swans (C. cygnus bewickii) were treated using disodium calcium ethylenediaminetetraacetate (CaEDTA). The concentration of blood lead at the time of admission averaged 4.6, ranging from 3.2 to 8.0μg/ml in swans, and averaged 5.6, ranging from 0.4 to 23.0μg/ml in wildgeese. In all of the swans 4 to 40 lead pellets, with an average of 17 were seen on radiographs of their gizzards. In 22 of the geese 1 to 48 lead pellets, with an average of 10.5 per bird, were seen. The blood lead levels decreased to about 1/2 to 1/5 of the initial values one week after the institution of the therapy in all the bird treated. Eleven of 27 birds recovered 3 to 8 weeks after the therapy. These lead shots were rapidly eroded as the birds recovered their appetite in re-sponse to the treatment and disappeared no radiographs during treatment days 17 to 52. Sixteen geese and all the swans failed to recover their apPetite and died within 4 weeks in spite of a decrease in the concentra-tion of blood lead.
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