Epidemiology and identification of two species of Chilodonella affecting farmed fishes in China

Li, Ming, Wang, Runqiu, Gomes, Giana Bastos, Zou, Hong, Li, Wen-xiang, Wu, Shan-gong, Wang, Gui-tang, and Ponce-Gordo, Francisco (2018) Epidemiology and identification of two species of Chilodonella affecting farmed fishes in China. Veterinary Parasitology, 264. pp. 8-17.

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Abstract

The genus Chilodonella includes free-living ciliated protozoa as well as pathogenic species for freshwater fish, with Chilodonella hexasticha and Chilodonella piscicola being the most important ones. These parasites cause outbreaks with high mortalities among farmed freshwater fishes with great economic losses. There are few reports of these species in China, and their identification has been based mostly on their morphological characteristics. In the present work, the parasites causing five outbreaks occurring in China between 2014 and 2017 have been identified by morphological and genetic analysis. We provide the first records of Ctenopharingodon idella and Siniperca chuatsi as hosts of C. hexasticha, and of Procypris rabaudi and Schizothorax wangchiachii as hosts of C. piscicola. There are no differences in the gross pathological findings produced by C. hexasticha and C. piscicola, consisting in desquamation and necrosis of epithelial cells in the skin and gills and in severe fusion of gill lamellae. However, both species differ in their geographic distribution: C. piscicola was found in farms located at altitudes over 1500 m above sea level and with a water temperature ≤18 °C, while C. hexasticha was found in farms located at altitudes under 50 m above sea level and with a water temperature ≥21 °C. Present results confirm that C. hexasticha and C. piscicola are two different species that can be differenced by their morphology; however, their biological variability may lead to erroneous identifications and the diagnosis should be preferably based in genetic analysis including nuclear LSU rDNA and mitochondrial SSU rDNA sequences.

Item ID: 56037
Item Type: Article (Research - C1)
ISSN: 1873-2550
Funders: National Natural Science Foundation of China (NNSFC), Youth Innovation Promotion Association (YIPA), China Agriculture Research System (CARS)
Projects and Grants: NNSFC No. 31772429, NNSFC No. 31471978, YIPA No. Y82Z01, CARS-45-15
Date Deposited: 06 Nov 2018 03:37
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0707 Veterinary Sciences > 070708 Veterinary Parasitology @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830102 Aquaculture Fin Fish (excl. Tuna) @ 100%
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