Redial growth and cercarial productivity of Fasciola hepatica in three species of young lymnaeid snails

2002 ◽  
Vol 76 (3) ◽  
pp. 269-272 ◽  
Author(s):  
P. Vignoles ◽  
G. Dreyfuss ◽  
D. Rondelaud
Keyword(s):  
Body Length ◽  
Significant Influence ◽  
Fasciola Hepatica ◽  
Snail Species ◽  
Post Exposure ◽  
Experimental Infections ◽  
Laboratory Conditions ◽  
The Mean ◽  
Cattle Strain

AbstractExperimental infections of 1-mm high snails using three populations of Lymnaea (L. glabra, L. ovata and L. truncatula) and a cattle strain of Fasciola hepatica miracidia were carried out under laboratory conditions to determine if the snail species had an effect on the number of free rediae, their growth, and cercarial productivity in relation to each redial category (R1a, R1b, R2a, or R2b/R3a). The total number of rediae ranged from 6.4 to 7.5 per snail. The mean body length of rediae varied from 1–1.2 mm (R1a) to 0.3–0.4 mm (R2b/R3a). The width of the intrapharyngeal lumen also varied from 26.0–38.8 μm to 3.0–4.2 μm, respectively. The redial category had a significant effect on both measurements, whereas snail species only had a significant influence on body length. The mean number of cercariae produced by all living rediae at day 49 post-exposure ranged from 63.0 in L. glabra to 87.2 in L. truncatula. In L. ovata and L. truncatula, 55.8% and 58.6% of cercariae, respectively, were produced by R2a rediae, whereas 53.9% of cercariae in L. glabra were formed by the R1b rediae. When young snails were infected with F. hepatica, the species of snail had an effect on the number of living rediae, their length and their cercarial productivity.

Cercarial productivity of redial generations in single-miracidium infections of Lymnaea truncatula with Paramphistomum daubneyi or Fasciola hepatica

2000 ◽  
Vol 74 (1) ◽  
pp. 1-5 ◽  
Author(s):  
M. Abrous ◽  
D. Rondelaud ◽  
G. Dreyfuss
Keyword(s):  
Fasciola Hepatica ◽  
The Other ◽  
Redial Generation ◽  
Post Exposure ◽  
Laboratory Conditions ◽  
Lymnaea Truncatula

AbstractSingle-miracidium infections of Lymnaea truncatula with Paramphistomum daubneyi or with Fasciola hepatica were carried out under laboratory conditions to count free rediae, their germinal embryos, and to determine the cercarial productivity of each redial generation. In snails infected by P. daubneyi, the cercariae were produced by the first (8.7 cercariae per redia) and second (8.9 per redia) generations. At day 63 post-exposure, they corresponded, respectively, to 53.9% and 46.1% of cercariae produced by all rediae. In snails infected by F. hepatica, the majority of cercariae were produced by the R2a group (18.2 cercariae per redia) and corresponded to 66.0% of cercariae produced all rediae. The cercariae produced by the other redial groups were more limited in number: 17.5 per redia in the R1b group (28.7%) and 2.0 per redia in the R2b/R3a group (5.3%). Cercarial productivity of P. daubneyi until day 63 post-exposure was more limited in number than that of F. hepatica: a total of 145 cercariae per snail versus 427 per snail.

scholarly journals Differences in the compatibility of infection between the liver flukes Fascioloides magna and Fasciola hepatica in a Colombian population of the snail Galba sp.

2014 ◽  
Vol 89 (6) ◽  
pp. 720-726 ◽  
Author(s):  
G. Dreyfuss ◽  
A.C. Correa ◽  
F.F. Djuikwo-Teukeng ◽  
A. Novobilský ◽  
J. Höglund ◽  
...  
Keyword(s):  
Czech Republic ◽  
Larval Development ◽  
Fasciola Hepatica ◽  
Intermediate Hosts ◽  
The Czech Republic ◽  
Galba Truncatula ◽  
Fascioloides Magna ◽  
Post Exposure ◽  
Experimental Infections ◽  
Liver Flukes

AbstractExperimental infections of Galba sp. (origin, Colombia) with allopatric isolates of Fasciola hepatica from France or Fascioloides magna from the Czech Republic were carried out during five successive snail generations to determine if this lymnaeid might sustain complete larval development of either parasite. In snails exposed to F. hepatica, 7 of 400 snails harboured several rediae and only two snails contained a small number of free cercariae on day 50 post-exposure. In contrast, the intensity of F. magna infection in Galba sp. progressively increased from the F1 to F5 generations. Spontaneous cercarial shedding of F. magna occurred in 7 of 100 Galba sp. belonging to the F5 generation and the number of shed cercariae did not differ significantly from that noted in control Galba truncatula of French origin. Galba sp. from Colombia can be added to the list of potential intermediate hosts for F. magna.

The development of rediae ofFasciola hepaticainRadix natalensissubjected twice to bimiracidial exposures

2010 ◽  
Vol 85 (2) ◽  
pp. 210-214 ◽  
Author(s):  
Y. Dar ◽  
P. Vignoles ◽  
G. Dreyfuss ◽  
D. Rondelaud
Keyword(s):  
High Frequency ◽  
Fasciola Hepatica ◽  
Snail Population ◽  
Developmental Patterns ◽  
Post Exposure ◽  
Experimental Infections ◽  
French Isolate ◽  
Over Time

AbstractExperimental infections of EgyptianRadix natalensiswith a French isolate ofFasciola hepatica(each snail was subjected twice to a bimiracidial exposure) were carried out to determine how many sporocysts grew in these snails and to study the developmental patterns of redial generations. Single-sporocyst infections were found in 69.3% (34/49) of infected snails, with equivalent numbers of normal and abnormal patterns. Snails with two- and three-sporocyst infections were 24.4% and 6.1%, respectively. In single- and two-sporocyst infections at days 42 and 56 post-exposure, the total redial burden was significantly higher in snails with a normal redial development. In two- and three-sporocyst infections, the overall maturity of rediae was delayed at days 42 and 56. The high frequency of abnormal patterns inR. natalensis(53.1% of all infected snails showed degeneration of a first mother redia) might be due to incomplete adaptation between the snail population and the parasite. The delayed redial maturity in two- and three-sporocyst infections can mainly be explained by the volume of the snail body, which would be insufficient to allow the simultaneous differentiation of most rediae over time.

The presence of predators modifies the larval development of Fasciola hepatica in surviving Lymnaea truncatula

2002 ◽  
Vol 76 (2) ◽  
pp. 175-178 ◽  
Author(s):  
D. Rondelaud ◽  
P. Vignoles ◽  
G. Dreyfuss
Keyword(s):  
Survival Rate ◽  
Larval Development ◽  
Significant Variation ◽  
Fasciola Hepatica ◽  
Stress Reaction ◽  
Experimental Exposure ◽  
Post Exposure ◽  
Progressive Development ◽  
Experimental Infections ◽  
Lymnaea Truncatula

AbstractExperimental infections of Lymnaea truncatula with Fasciola hepatica were performed to study the consequences of the presence of predators (sciomyzid larvae or zonitid snails) on the characteristics of larval F. hepatica development in surviving snails. Controls consisted of infected snails that were not subjected to predators. Compared to controls, the survival rate at day 30 post-exposure, the duration of cercarial shedding, and the number of cercariae shed by surviving snails were significantly lower when predators were present in snail breeding boxes, whatever the type of predator used. In contrast, the prevalences of Fasciola infections in snails, and the length of time between exposure and the onset of cercarial shedding showed no significant variation. The progressive development of a stress reaction in surviving snails against predators during the first 30 days of experimental exposure to F. hepatica would influence snail survival during the cercarial shedding period and, consequently, the number of cercariae shed by the snails.

Total cercarial output in two populations of Galba truncatula experimentally infected with Fasciola hepatica

2009 ◽  
Vol 84 (1) ◽  
pp. 77-80
Author(s):  
P. Vignoles ◽  
F. Aimeur ◽  
A. Titi ◽  
D. Rondelaud ◽  
A. Mekroud ◽  
...  
Keyword(s):  
Fasciola Hepatica ◽  
Snail Host ◽  
The Other ◽  
Galba Truncatula ◽  
Post Exposure ◽  
Complete Development ◽  
Experimental Infections ◽  
Two Populations

AbstractExperimental infections of pre-adult Galba truncatula (two populations) using one, two, three or five miracidia of Fasciola hepatica per snail were carried out to determine the total number of cercariae produced by snails when they were sacrificed at day 70 post-exposure (at 24°C). When the number of miracidia used for each snail increased at exposure, significant numerical augmentations of live rediae and of intraredial differentiating cercariae were noted. In contrast, only insignificant differences between mean numbers of free cercariae were found. The number of metacercariae produced by each snail (after shedding and/or after dissection) increased in infections with up to three miracidia per snail in each population and strongly decreased in infections with five miracidia per snail. Compared to the other types of infections, the delay of cercarial differentiation noted in the five-miracidia groups was probably due to the volume of the snail host, which would be too small to assure the complete development of five sporocysts.

Larval productivity ofFasciola giganticain two lymnaeid snails

2004 ◽  
Vol 78 (3) ◽  
pp. 215-218 ◽  
Author(s):  
Y. Dar ◽  
P. Vignoles ◽  
D. Rondelaud ◽  
G. Dreyfuss
Keyword(s):  
Life Span ◽  
Intermediate Host ◽  
Fasciola Gigantica ◽  
Prepatent Period ◽  
Snail Species ◽  
Galba Truncatula ◽  
Post Exposure ◽  
The Mean ◽  
Lymnaea Natalensis

AbstractTwo groups ofGalba truncatulaand two groups ofLymnaea natalensiswere experimentally infected withFasciola giganticato determine if snail species had an influence on the redial burden and cercarial shedding of this trematode when snails of both species were infected with the same isolate of miracidia. In the two groups used for the study of redial burden, the total number of free rediae was significantly higher at day 49 post-exposure inL. natalensisthan inG. truncatula. In the groups used for cercarial shedding, the life-span of cercaria-shedding snails and those of infected snails which died without cercarial emission, and the duration of the prepatent period were significantly longer inL. natalensisthan those noted inG. truncatula. However, the mean numbers of shed cercariae did not significantly differ and showed no differences in their daily distribution throughout the shedding period. These results demonstrate thatG. truncatulamight be the principal intermediate host ofF. giganticain Egypt, at least in the areas where this lymnaeid species lives.

Paramphistomum daubneyi and Fasciola hepatica: the prevalence of natural or experimental infections in four species of freshwater snails in eastern France

1999 ◽  
Vol 73 (3) ◽  
pp. 197-202 ◽  
Author(s):  
F. Degueurce ◽  
M. Abrous ◽  
G. Dreyfuss ◽  
D. Rondelaud ◽  
J. Gevrey
Keyword(s):  
Fasciola Hepatica ◽  
Freshwater Snails ◽  
Snail Species ◽  
Physa Acuta ◽  
Trematode Infection ◽  
Experimental Infections ◽  
Full Development ◽  
Lymnaea Truncatula

Parasitological investigations were performed in July and September–October 1997 in six farms located in the department of Saône et Loire (eastern France) to determine the prevalence of natural infections with Paramphistomum daubneyi and Fasciola hepatica in four species of freshwater snails. Cercaria-containing rediae of P. daubneyi and/or F. hepatica were found in Lymnaea palustris (one snail only) and Lymnaea truncatula. Some living sporocysts and immature rediae were noted in Lymnaea ovata (P. daubneyi or F. hepatica) and in Physa acuta (P. daubneyi only). The prevalence of each trematode infection was often less than 10%. Experimental infections of juvenile and preadult snails (1 and 4 mm in height, respectively) were also performed to test the susceptibility of these four snail species to P. daubneyi, either singly or in combination with F. hepatica. Both 1 and 4 mm high L. truncatula could sustain the full development of P. daubneyi, whether in single or double infections. In L. palustris dually exposed to both trematodes, cercaria-containing rediae of P. daubneyi were found in one juvenile and one preadult snails, while immature infections were noted in ten juvenile and two preadult snails. The overall prevalence of P. daubneyi infection in L. palustris was 11.1% in juvenile snails and 2.1% in preadults. Larval forms of P. daubneyi and F. hepatica were only noted in dually-exposed juvenile L. ovata and P. acuta. In L. ovata, mature and immature rediae of F. hepatica were detected in 17.6% of snails, while immature rediae of P. daubneyi were noted in 4.4% of snails. In P. acuta, only immature infections were detected (5.1% of snails with P. daubneyi, and 1.2% with F. hepatica). These results demonstrated that Lymnaea species other than L. truncatula could sustain the full development of P. daubneyi and that immature larvae of this trematode might be found in naturally- or experimentally-infected L. ovata and P. acuta.

scholarly journals Use of Two Aquatic Snail Species as Bioindicators of Heavy Metals in Tigris River-Baghdad

2020 ◽  
pp. 1589-1592
Author(s):  
Harith Saeed Al-Warid ◽  
Hayder Z Ali ◽  
Ghassan Nissan ◽  
Abbas Haider ◽  
Ahmed Yosef
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Soft Tissues ◽  
Snail Species ◽  
Tigris River ◽  
The Mean ◽  
Mean Concentration ◽  
Bellamya Bengalensis

     Thirty individuals of Bellamya bengalensis and Physella acuta were collected and identified from the Tigris River in Baghdad during the period between October to November 2017. The efficiency of bioaccumulation of the two species as bioindicators for aquatic heavy metal pollution with Cd, Ni, Pb and Cu was investigated. Both snail species had the ability to accumulate heavy metals. The mean of Ni concentration in soft tissues of both snails was 1.53 ppm while the mean concentration of other heavy metals was significantly lower; they reached 0.51 ppm, 0.36 ppm and 0.29 ppm, respectively. While no significant differences between B. bengalensis and  P.acuta were noticed in the ability to accumulate the heavy metals. It is concluded that both snails shared the features of good bioindicators due to their sensitivity to pollution.:

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