Hearing organs of the Odontoceti from two mass strandings in 1983 and 1986 were examined histopathologically. In the 1983 stranding, two of three pilot whales (Globicephala macrorhynchus) were necropsied and numerous Nasitrema sp. were found close to the eighth cranial nerve (nervus vistibulo cochlearis) in both animals. Patchy degeneration of the eighth cranial nerve in and out of the modiolus of the cochlea was observed. In the 1986 stranding, five of 125 false killer whales (Pseudorca crassiclens) were examined and numerous trematodes (Nasitrema gondo) were found in the tympanic cavities. Severe degeneration of the eighth cranial nerve was discovered and there were many trematode eggs in the nervous and surrounding tissues. Parasitogenic eighth neuropathy is proposed again as the cause of mass stranding of the Odontoceti.
Articles|
October 01 1987
MASS STRANDING OF ODONTOCETI CAUSED BY PARASITOGENIC EIGHTH CRANIAL NEUROPATHY
T. Morimitsu;
T. Morimitsu
1 Department of Otorhinolaryngology, Miyazaki Medical College, Kiyotake, Miyazaki, 889–16 Japan
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T. Nagai;
T. Nagai
1 Department of Otorhinolaryngology, Miyazaki Medical College, Kiyotake, Miyazaki, 889–16 Japan
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M. Ide;
M. Ide
1 Department of Otorhinolaryngology, Miyazaki Medical College, Kiyotake, Miyazaki, 889–16 Japan
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H. Kawano;
H. Kawano
1 Department of Otorhinolaryngology, Miyazaki Medical College, Kiyotake, Miyazaki, 889–16 Japan
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A. Naichuu;
A. Naichuu
1 Department of Otorhinolaryngology, Miyazaki Medical College, Kiyotake, Miyazaki, 889–16 Japan
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M. Koono;
M. Koono
2 Department of Second Pathology, Miyazaki Medical College, Kiyotake, Miyazaki, 889–16 Japan
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A. Ishii
A. Ishii
3 Department of Parasitology, Okayama University School of Medicine, Shikatachou, Okayama, 700 Japan
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J Wildl Dis (1987) 23 (4): 586–590.
Article history
Received:
November 17 1986
Citation
T. Morimitsu, T. Nagai, M. Ide, H. Kawano, A. Naichuu, M. Koono, A. Ishii; MASS STRANDING OF ODONTOCETI CAUSED BY PARASITOGENIC EIGHTH CRANIAL NEUROPATHY. J Wildl Dis 1 October 1987; 23 (4): 586–590. doi: https://doi.org/10.7589/0090-3558-23.4.586
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