水温对多子小瓜虫孵化及幼虫活力的影响

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Abstract

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.

Key words： Ichthyophthirius multifiliis activity power of theronts water temperature influence

Received: 25 April 2010

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	ZHANG Qi-zhong
	ZHANG Zhan-hui
	CHEN Da-li

Cite this article:

ZHANG Qi-zhong,ZHANG Zhan-hui,CHEN Da-li. Influence of water temperature on hatchability and activity power of theront of Ichthy ophthirius multifiliis[J]. , 2010, 29(2): 116-120.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I2/116

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