文献类型： 外文期刊

作者： Jiang, B. ¹ ; Li, Y. W. ³ ; Abdullahi, A. Y. ¹ ; Dan, X. M. ³ ; Gong, H. ⁴ ; Ke, Q. Z. ⁵ ; Li, A. X. ² ; Li, G. Q. ¹ ;

作者机构： 1.South China Agr Univ, Coll Vet Med, Guangzhou 510642, Guangdong, Peoples R China

2.Sun Yat Sen Univ, State Key Lab Biocontrol, Key Lab Aquat Prod Safety, Minist Educ, Guangzhou 510275, Guangdong, Peoples R China

3.South China Agr Univ, Coll Anim Sci, Guangzhou 510642, Guangdong, Peoples R China

4.Fujian Acad Agr Sci, Inst Biotechnol, Fuzhou 350003, Fujian Province, Peoples R China

5.Ningde Fufa Fisheries Co Ltd, Ningde 352002, Peoples R China

关键词： Marine fish;Plectorhinchus cinctus;Cryptocaryon irritans;Tomonts;Control

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

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收录情况： SCI

摘要： Cryptocaryoniasis is a severe parasitic disease caused by ciliate Cryptocaryon irritans in farmed marine fish. To control this disease, we established a method to interrupt the life cycle of C. irritans via the removal of its tomonts. Marine fish Plectorhinchus cinctus were divided randomly into four groups, including placemat removal group (Group I), rotational culturing group (Group II), infection control group (IF group) and blank control group (Control); the former three groups were infected with C. irritans at low dose. A daily food consumption (DFC), relative infection intensity (RII) and survival rate of each group were observed. At 4-week post infection, some fish were challenged with C. irritans theronts at a lethal dose. Results showed that the fish' DFC in IF Group, Group I and II decreased significantly on 2nd day post infection, and gradually restored food intake when the trophonts exited the fish on the 5th day. However, their DFC in IF Group decreased significantly on 7th day, and eventually stopped feeding. Trophonts on fish' body of the three groups began to reduce from the 4th day and those of Group I and II almost disappeared on the 7th day, conversely the trophonts of IF group increased ten times. At 2-week post infection, the survival rates of Group I, II, IF and Control were 97%, 98%, 0%, and 100%, respectively. The survival rates of Group I, II and Control were 88.3%, 93.3%, 66.7%, respectively after challenge. Results demonstrate that placemat and rotational culturing method to remove tomonts can effectively control C. irritans infection.