イルカ集団自殺の原因としての寄生虫性聴神経炎 -第2報-

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  • Parasitogenic Octavus Neuropathy as a Possible Cause of Mass Stranding of Cetaceans -Second Report-

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In 1982, we have reported the results of histological examinations of the ear of the mass stranded dolphins in MIYAZAKI and concluded that parasitogenic octavus neuropathy should be a possible cause of the mass stranding of them.<BR>On 22nd May 1983, mass stranding of dolphins (a kind of Globicephalus) had occured again at the same seashore of Aoshima, MIYAZAKI. We have examined 2 heads of them and found a lot of parasites (Nasitrema gondo YAMAGUCHI) in the tympanic cavity.<BR>Histological examination of the periotic and tympanic bone revealed again severe degeneration of octavus nerve, especially in the modiolus of the cochlea. There had been observed patchy distribution of degenerated and almost normal nerve fiver in the modiolus with decrease in the number of the spiral ganglion cells. Furthermore their stomacks were completely empty. From the results obtained we would like to maintain that parasitogenic octavus neuropathy should be the real cause of the mass stranding of teethed whales (Odontoceti).

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