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Population growth of Gyrodactylus kobayashii in goldfish (Carassius auratus) associated with host density

Published online by Cambridge University Press:  21 April 2022

Xiao Jin Open the ORCID record for Xiao Jin [Opens in a new window] ,
Hong Zou ,
Ming Li Open the ORCID record for Ming Li [Opens in a new window] ,
Shangong Wu ,
Guitang Wang ,
David J. Marcogliese  and
Wenxiang Li Open the ORCID record for Wenxiang Li [Opens in a new window]
Xiao Jin
Affiliation:
Key Laboratory of Aquaculture Disease Control, Ministry of Agriculture, and State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
Hong Zou
Affiliation:
Key Laboratory of Aquaculture Disease Control, Ministry of Agriculture, and State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China
Ming Li
Affiliation:
Key Laboratory of Aquaculture Disease Control, Ministry of Agriculture, and State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China
Shangong Wu
Affiliation:
Key Laboratory of Aquaculture Disease Control, Ministry of Agriculture, and State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China
Guitang Wang
Affiliation:
Key Laboratory of Aquaculture Disease Control, Ministry of Agriculture, and State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China
David J. Marcogliese
Affiliation:
Aquatic Contaminants Research Division, Water Science and Technology Directorate, Science and Technology Branch, Environment and Climate Change Canada, St. Lawrence Centre, 105 McGill, 7th floor, Montreal, Quebec H2Y 2E7, Canada St. Andrews Biological Station, Fisheries and Oceans Canada, 125 Marine Science Drive, St. Andrews, New Brunswick E5B 0E4, Canada
Wenxiang Li*
Affiliation:
Key Laboratory of Aquaculture Disease Control, Ministry of Agriculture, and State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
*
Author for correspondence: Wenxiang Li, E-mail: liwx@ihb.ac.cn
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Abstract

Host density is a key regulatory factor in parasite transmission. The goldfish (Carassius auratus)-Gyrodactylus kobayashii model was used to investigate effects of host density on population growth of gyrodactylids. A donor fish infected by five gravid gyrodactylids was mixed with 11 parasite-free goldfish at five host densities. There was a significant positive correlation between host density and mean abundance of G. kobayashii throughout the 58-day experiment. During early infection (days 15–24), mean abundance in medium high (0.5 fish L−1) and high host density groups (1 and 2 fish L−1) was significantly higher than that in the low host density groups (0.125 and 0.25 fish L−1). At high host density, prevalence increased more rapidly, and the peak prevalence was higher. Fitting of an exponential growth model showed that the population growth rate of the parasite increased with host density. A hypothesis was proposed that higher host density contributed to increased reinfection of detached gyrodactylids. A reinfection experiment was designed to test this hypothesis. Both mean abundance and prevalence at a host density of 1 fish L−1 were significantly higher than those at 0.25 fish L−1 on days 1 and 3, which suggested that more reinfections of G. kobyashii occurred at the higher host density. Density-dependent transmission during the early infection was an important contributor of population growth of G. kobayashii, as well as density-dependent reinfection of the detached gyrodactylids.

Keywords

Density-dependent transmissiondetachmentgyrodactylidsreinfection
Type
Research Article
Information
Parasitology , Volume 149 , Issue 8 , July 2022 , pp. 1057 - 1064
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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