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Antiprotozoal screening of traditional medicinal plants: evaluation of crude extract of Psoralea corylifolia against Ichthyophthirius multifiliis in goldfish.
MedLine Citation:
PMID:  23559379     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Ichthyophthirius multifiliis (also called "ich") is an external protozoan parasite that may infest almost all freshwater fish species and caused significant economic damage to the aquaculture industry. Since the use of malachite green was banned, there have been relatively few effective alternative strategies for controlling I. multifiliis infections. The present study was designed to screen potential antiparasitic medicinal plants based on our previous studies, and comprehensively evaluate in vitro and in vivo anti-ich activity of selected plant extracts. The screening results showed that the methanol extract of Psoralea corylifolia had the highest activity against I. multifiliis theronts. In vivo theront trials demonstrated that 1.25 mg/L or more concentrations of P. corylifolia methanol extract caused 100 % mortality during the 4-h exposure period, and the subsequent in vitro trials indicated that the minimum concentration of P. corylifolia methanol extract that prevented the initial infestation was 2.50 mg/L. Protomonts and encysted tomonts surviving trials suggested that encysted tomonts were less susceptible to P. corylifolia methanol extract than protomonts, and the methanol extract of P. corylifolia at a concentration of 5.00 mg/L could kill 100 % of protomonts and 88.89 % of encysted tomonts. It was also observed that after 12-h exposure of protomonts or encysted tomonts to 2.50 mg/L of P. corylifolia methanol extract, the theronts emerged from encysted tomonts led to more infection level than the ones in the other groups. The results suggested that whether the protomonts finish encystment is crucial to the survival, reproduction, and theronts infectivity. In addition, our results showed that long duration (24 h) and high concentration (5.00 mg/L) significantly reduced the survival and reproduction of I. multifiliis tomont exited from the fish after in-bath treatment, and it is indicated that P. corylifolia methanol extract had a potential detrimental effect on I. multifiliis trophont in situ.
Authors:
Fei Ling; Cheng Lu; Xiao Tu; Yanglei Yi; Aiguo Huang; Qizhong Zhang; Gaoxue Wang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-4-5
Journal Detail:
Title:  Parasitology research     Volume:  -     ISSN:  1432-1955     ISO Abbreviation:  Parasitol. Res.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-4-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8703571     Medline TA:  Parasitol Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, People's Republic of China.
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