Cercariae of trematodes in freshwater snails were studied in 1694 snails collected from rivers and streams in three climatic zones of Sri Lanka during 2005 to 2008. Four snail species; Thiara scabra, T. tuberculata, Paludomous sphearica and Gyraulus saigonensis were collected from nine sites in four districts; Matale, Kandy, Kegalle, and Kurunegala. Snails were allowed to release cercariae unde...

The prevalence of cercarial infection in freshwater snails and their evolutionary trends were studied in Nakhon Nayok province, Thailand. A total of 2,869 individual snails were examined for parasitic infections. The results showed that 12 snail species were found to host larval stages of trematodes with an overall prevalence of 4.7%. The infected specimens included 7 types at the cercarial sta...

Cercarial behavior patterns were examined in 4 species of frog lung flukes (Haematoloechus spp.). Cercariae of Haematoloechus complexus, Haematoloechus medioplexus, Haematoloechus longiplexus, and Haematoloechus varioplexus were exposed to 3 species of experimental arthropods and an inanimate control. The number of cercariae attached to an experimental host at 5 min postexposure was recorded. H...

Helisoma trivolvis snails collected from a lake in Warren County, New Jersey, in June 2007 possessed the ectosymbiont Chaetogaster limnaei (Annelida). Some of these snails were also infected with larval stages of Zygocotyle lunata and Echinostoma trivolvis. Chaetogaster limnaei associated with the infected snails fed on the cercariae of both digeneans. Zygocotylae lunata cercariae were observed...

Twenty mice were exposed to cercariae from mollusks treated with hydrocortisone and another 20 mice received cercariae from non-treated mollusks. The behavior of the parasites from the two groups of mollusks was compared based on the ability of cercariae to penetrate mice, on the total number of worms recovered after eight weeks of infection, on the relationship between the number of penetratin...

The pathogenicity of Diplostomum cercariae shed from two different snail species (Lymnaea. stagnalis and Radix auricularia) to rainbow trout fry (5-6 cm body length) was investigated. Thus, 1000 cercariae per fish elicited 100 % mortality within 24 h. Cercariae shed from L. stagnalis (Diplostomum pseudospathaceum) elicited higher mortality in rainbow trout compared to cercariae (Diplostomum par...

background: trematodes are a diverse group of endoparasites which require molluscan and vertebrate animals as intermediate and definitive hosts in their life cycle. the present study was carried out to determine the diversity and geographic distribution of infection with trematodes’cercariae in the snail lymnaea gedrosiana from north-west iran. methods: a total number of 6759 lymnaeidae snails ...

The transmission dynamics of the cercariae of Diplostomum spathaceum were investigated under laboratory conditions using cercariae collected from naturally infected Lymnaea stagnalis. Cercariae were kept in a constant temperature of 20 degrees C and the survival and infectivity to naïve young rainbow trout recorded at 3-h intervals until few cercariae were alive. Mortality initially remained co...

The cercarial density in natural water and number of infected Bulinus globosus were monitored over a one-year period to identify the transmission foci in an endemic area of schistosomiasis haematobia in Kenya. Overall prevalence and intensity of infection of the study community were 59.2% and 10.9 eggs/10 ml of urine. Cercariometry was carried out on 456 occasions at 20 study sites while snail ...

Trematode cercariae are commonly found in many freshwater gastropods. These cercariae can serve to identify the occurrence of such trematodes as Centrocestus formosanus, Haplorchis taichui, Haplorchoides sp, and Stellantchasmus falcatus, which are important parasites in Chiang Mai Province, Thailand. As the species of these cercariae cannot be identified accurately based on morphology, this stu...