Intestinal disease of scattered mirror carp Cyprinus carpio caused by Thelohanellus kitauei and notes on the morphology and phylogeny of the myxosporean from Sichuan Province, southwest China

文献类型： 外文期刊

第一作者： Ye Lingtong

作者： Ye Lingtong;Wang Jiangyong;Ye Lingtong;Wang Jiangyong;Lu Mingmiao;Li Wenxiang;Zou Hong;Wu Shangong;Wang Guitang;Lu Mingmiao;Li Wenxiang;Zou Hong;Wu Shangong;Wang Guitang;Quan Keyan

作者机构：

关键词： intestinal disease;scattered mirror carp;Thelohanellus kitauei;host-specific tropism;morphology;phylogeny

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2017 年 35 卷 3 期

页码：

收录情况： SCI

摘要： The mass mortality of pond-reared scattered mirror carp, Cyprinus carpio, caused by Thelohanellus kitauei, occurred at fish farms in Sichuan Province, southwest China. Morphological and molecular analyses were supplemented with histological evaluation of infected tissues to better understand the route of infection and the pathological effects of T. kitauei on the fish host. The intestine of the diseased host was full of large cysts of the myxosporean. The cysts range from 2 cm to 3.6 cm in diameter. Histopathology indicated that T. kitauei first invaded the submucosa of the host intestine and then moved into the mucosa layers with the development of their spores, finally entering into the enteric cavity of the hosts after the disruption of mucosa layers. The pyriform spores of T. kitauei were surrounded by the transparent spore sheath, measuring 25.98 mu m +/- 0.95 mu m in body length, 8.72 mu m +/- 0.51 mu m in body width, and 7.86 mu m +/- 0.26 mu m in body thickness. The single polar capsule was pyriform, measuring 14.73 mu m +/- 0.92 mu m in length and 6.82 mu m +/- 0.45 mu m in width, with eight to 10 turns of filament coils winding inside. Phylogenetic analysis based on the 18S small-subunit ribosomal DNA sequences indicated that minimal genetic differences were present between T. kitauei samples from South Korea and from China. Close affinity was found between the genus Thelohanellus and Myxobolus. Additionally, two polar capsule nuclei were found at the anterior end of the single polar capsule in spores of T. kitauei stained with hematoxylin and eosin, which suggested the separation of the genus Thelohanellus from Myxobolus.

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