Influence of water temperature on hatchability and activity power of theront of Ichthy ophthirius multifiliis
ZHANG Qi-zhong1,2, ZHANG Zhan-hui1, CHEN Da-li2, CUI Chao2
1. Institute of Hydrobiology, Jinan University, Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering Ministry of Education, Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institutes, Guangzhou 510632, China; 2. Key Laboratory of Aquatic science of Chongqing, Chongqing 400715, China
Ichthyophthiriasis, commonly known as "white spot disease", is the most important disease of freshwater fishes. The pathogen, Ichthyophthirius multifiliis, is an obligatory parasitic ciliate that parasitizes the epidermis and gills of freshwater fishes, and is greatly affected by water temperature. In order to illuminate the role of water temperature in parasite life cycle, the authors investigated the influence of water temperature on cyst formation, hatchability, and activity power of theront under experimental condition. The results are as follows. The theronts of I. multifiliis were not able to be produced from parasite cysts when the water temperature was about 4℃ or from 28~32℃, but a few cysts could survive in such low or high temperatures. While the water temperature was between 9~27℃, the cyst-formation and hatch period gradually became shorter and the hatch rate rose to 100% with the increasing temperature. Meanwhile, the activity power of theronts was enhanced, but kept in a shorter period of about 4 hours with rising of water temperature. Therefore, it is suggested that I. multifiliis should be cultured under water temperature of about 23℃ for various experiments including artificial infection, and the theronts should be used in 4 hours after hatch.
张其中1,2*, 张占会1, 陈达丽2, 鉏超2. 水温对多子小瓜虫孵化及幼虫活力的影响[J]. , 2010, 29(2): 116-120.
ZHANG Qi-zhong1,2, ZHANG Zhan-hui1, CHEN Da-li2, CUI Chao2. Influence of water temperature on hatchability and activity power of theront of Ichthy ophthirius multifiliis. , 2010, 29(2): 116-120.
[1] Traxler G S, Richard J, and McDonald T E.Ichthyophthirius multifiliis (Ich) epizootics in spawning sockeye salmon in British Columbia, Canada[J].Journal of Aquatic Animal Health, 1998, 10:143-151.
[2] Clark T G, Lin T L, and Dickerson H W.Surface antigen cross-linking triggers forced exit of a protozoan parasite from its host[J].Proceedings of the National Academy of Sciences of the United States of America, 1996, 93:6825-6829.
[3] Dickerson H W, Clark T G, and Findly R C.Ichthyophthirius multifiliis has membrane associated immobilization antigens[J].The Journal of Protozoology, 1989, 36:159-164.
[4] Dickerson H W, Clark T G, and Leff A A.Serotypic variation among isolates of Ichthyophthirius multifiliis based on immobilization[J].The Journal of Eukaryotic Microbiology, 1993, 40:816-820.
[5] Swennes A G, Findly R C, and Dickerson H W.Cross-immunity and antibody responses to different immobilisation serotypes of Ichthyophthirius multlfiliis[J].Fish and Shellfish Immunology, 2007, 22:589-597.
[6] Wang X, Clark T G, Noe J, and Dickerson H W.Immunisation of channel catfish, Ictalurus punctatus, with Ichthyophthirius multifiliis immobilisation antigens elicits serotype-specific protection[J].Fish and Shellfish Immunology, 2002, 13:337-350.
[7] Ekanem A P, Obiekezie A, Kloas W, et al.Effects of crude extracts of Mucuna pruriens (Fabaceae) and Carica papaya(Caricaceae) against the protozoanfish parasite Ichthyophthirius multifiliis[J].Parasitology Research, 2004, 92:361-366.
[8] 倪达书, 李连祥.多子小瓜虫的形态生活史及其防治方法和一新种的描述[J].水生生物学集刊, 1960, 2:197-225.
[9] Ewing M S and Kocan K M.lchthyophthirius multifiliis(Ciliophora) development in gill epithelium[J].Protozoology, 1986, 32:305-310.
[10] 钱龙, 艾涛, 谢恒修.温室培育乌鳢鱼苗对小瓜虫病的防治[J].中国水产, 1999, 10:33.
[11] Price D J and Cloyton G M.Genotype-environment interactions in the susceptibility of the common carp, Cyprinus carpio, to Ichthyophthirius multifiliis infections[J].Aquaculture, 1999, 173:149-160.