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Diseases of Aquatic Organisms

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DAO 129:63-70 (2018)  -  DOI: https://doi.org/10.3354/dao03223

Grass carp which survive Dactylogyrus ctenopharyngodonid infection also gain partial immunity against Ichthyophthirius multifiliis

Jian-Pei Li1,*, Yao-Wu Fu1,*, Qi-Zhong Zhang1,**, De-Hai Xu2, Yan-Meng Liu1, Sheng-Yu Zhou1, De-Jie Lin1

1Institute of Hydrobiology, Jinan University, Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering Ministry of Education, Guangzhou 510632, PR China
2United States Department of Agriculture, Agricultural Research Service, Aquatic Animal Health Research Unit, 990 Wire Road, Auburn, AL 36832-4352, USA
*These authors contributed equally to this work
**Corresponding author:

ABSTRACT: Dactylogyrus ctenopharyngodonid and Ichthyophthirius multifiliis are 2 important ectoparasites of fish. Both parasites can induce an immune response in fish that leads to a decrease in parasitic infection intensity and the development of resistance against parasitic reinfection. The present study evaluated whether grass carp Ctenopharyngodon idella that survived a D. ctenopharyngodonid infection could develop immunity against infection by D. ctenopharyngodonid and I. multifiliis. The results demonstrated that when grass carp were infected with D. ctenopharyngodonid, the number of red blood cells and the percentages of thrombocytes, monocytes, and neutrophils in the white blood cells increased significantly in the early stage of infection. The percentage of lymphocytes increased over time following parasitic infection. The mean infection intensity of D. ctenopharyngodonid decreased to 0 on Day 28. The activities of serum acid phosphatase, alkaline phosphatase, lysozyme, and superoxide dismutase increased significantly after D. ctenopharyngodonid infection. In addition, the grass carp that survived a previous D. ctenopharyngodonid infection could completely resist D. ctenopharyngodonid reinfection and partially resist I. multifiliis infection.


KEY WORDS: Carp · Fish farming · White spot disease · Monogenean · Ciliate protozoan · Immune response · Reinfection


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Cite this article as: Li JP, Fu YW, Zhang QZ, Xu DH, Liu YM, Zhou SY, Lin DJ (2018) Grass carp which survive Dactylogyrus ctenopharyngodonid infection also gain partial immunity against Ichthyophthirius multifiliis. Dis Aquat Org 129:63-70. https://doi.org/10.3354/dao03223

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