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Levels of infection of gastric nematodes in a flock of great cormorants (Phalacrocorax carbo) from Lake Biwa, Japan

Published online by Cambridge University Press:  22 February 2011

Kh.M. El-Dakhly ,
E. El-Nahass ,
S. Uni ,
H. Tuji ,
H. Sakai  and
T. Yanai
Kh.M. El-Dakhly
Affiliation:
Department of Veterinary Pathology, Gifu University, 1-1 Yanagido, Gifu501-1193, Japan Department of Veterinary Parasitology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef, Egypt
E. El-Nahass
Affiliation:
Department of Veterinary Pathology, Gifu University, 1-1 Yanagido, Gifu501-1193, Japan Department of Veterinary Pathology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef, Egypt
S. Uni
Affiliation:
Department of Medical Zoology, Osaka City University Medical School, 1-4-3 Ashimachi, Abeno-ku, Osaka545-8585, Japan
H. Tuji
Affiliation:
Department of Veterinary Pathology, Gifu University, 1-1 Yanagido, Gifu501-1193, Japan
H. Sakai
Affiliation:
Department of Veterinary Pathology, Gifu University, 1-1 Yanagido, Gifu501-1193, Japan
T. Yanai*
Affiliation:
Department of Veterinary Pathology, Gifu University, 1-1 Yanagido, Gifu501-1193, Japan
*
*Fax: +81-58-293-2943 E-mail: [email protected]
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Abstract

A high prevalence (86.7%) of various species of nematodes was observed in the stomach of great cormorants living in Lake Biwa, Japan. There were varying numbers of adults belonging to two common genera, Eustrongylides Jagerskiold 1909 (Nematoda: Dioctophymatidae) and Contracaecum Railliet & Henry 1912 (Nematoda: Anisakidae). The first included common adenophorean nematodes comprising a single species, Eustrongylides tubifex and the second comprised ascaroid nematodes that contained four named species: Contracaecum rudolphii Hartwich, 1964, Contracaecum microcephalum Yamaguti, 1961, Contracaecum multipapillatum Drasche, 1882 and Contracaecum chubutensis Garbin, 2008. After the prevalence and intensity of the infection had been noted, both types of nematodes were frequently observed to penetrate the mucosa and intrude into the wall of the glandular stomach, where they caused gross haemorrhage and ulceration. The Eustrongylides sp. was predominantly found in a nodular lesion of the proventricular wall, while Contracaecum spp. were observed either free in the lumen of the proventriculus or, on occasion, deeply penetrating its wall. Of the Contracaecum spp., C. rudolphii was the most prevalent. Grossly, large numbers of nematodes were present in infected stomachs (for C. rudolphii intensity was 1–34 and 3–57 nematodes in male birds and 1–21 and 1–32 in females; for C. microcephalum 1–2 and 1 in male birds and 1–2 in females; for C. multipapillatum 2 in male cormorants and no infection in females; for C. chubutensis 1–2 and 1 in male birds and 1–5 and 1 in females and for E. tubifex 1–5 nematodes in male birds and 2–8 in females). Ulcerative inflammation and hyperaemia were the most common pathological presentations, especially in areas that had been invaded by parasites. Microscopically, varying degrees of granulomatous inflammatory reactions were seen, in addition to degenerated nematodes which appeared to have deeply penetrated mucosal surfaces and were surrounded by fibrous connective tissues.

Type
Research Papers
Information
Journal of Helminthology , Volume 86 , Issue 1 , March 2012 , pp. 54 - 63
Copyright
Copyright © Cambridge University Press 2011

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