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Diseases of Aquatic Organisms

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DAO 124:181-191 (2017)  -  DOI:

Hematodinium spp. infections in wild and cultured populations of marine crustaceans along the coast of China

Jin-Feng Wang1,2, Meng Li1, Jie Xiao3,4, Wen-Jun Xu5, Cai-Wen Li1,4,*

1CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China
2Key Laboratory of Science and Engineering for Marine Ecology and Environment, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, PR China
3University of Chinese Academy of Sciences, Beijing 100049, PR China
4Marine and Fisheries Research Institute of Zhejiang Province, Zhoushan 316100, PR China
5Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, PR China
*Corresponding author:

ABSTRACT: The parasitic dinoflagellate Hematodinium spp. infects a broad range of marine crustaceans. Its epidemics have impacted wild populations of various commercial fishery species around the world and the sustainability of mariculture in China. To study the epidemiology of Hematodinium spp. in marine crustaceans along the coast of China, we conducted a broad survey of wild and cultured stocks of major crustacean species in 2013 to 2015. Hematodinium sp. infections were identified in wild stocks of Portunus trituberculatus from Huludao, Laizhou, Qingdao, Yangtze River Estuary and Zhoushan, and Scylla paramamosain from Shantou; and cultured stocks of Portunus trituberculatus and Penaeus monodon from a polyculture pond in Qingdao. In the polyculture pond, Hematodinium sp. infections were observed in Portunus trituberculatus from June until October, with peak prevalence (up to 90%) observed in late July to early August. Furthermore, Hematodinium sp. infection was identified for the first time in the giant tiger prawn Penaeus monodon in the polyculture system during the disease outbreak. Phylogenetic analysis indicated that the Hematodinium isolate infecting Penaeus monodon was identical to the isolate infecting the co-cultured Portunus trituberculatus, and it was grouped into H. perezi genotype II together with the other isolates reported in China. The Hematodinium sp. isolated from Portunus trituberculatus appeared to have similar life stages as the H. perezi genotype III isolated from the American blue crab Callinectes sapidus. Our study indicates that outbreaks of Hematodinium disease can be a significant threat to the widely used polyculture system for decapods in China that may be particularly vulnerable to such generalist pathogens.

KEY WORDS: Crab · Parasite · Epidemics · Prevalence · Life cycle · Transmission · Aquaculture

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Cite this article as: Wang JF, Li M, Xiao J, Xu WJ, Li CW (2017) Hematodinium spp. infections in wild and cultured populations of marine crustaceans along the coast of China. Dis Aquat Org 124:181-191.

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