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Fasciola hepatica: cercarial productivity of redial generations in long-surviving Galba truncatula

Published online by Cambridge University Press:  12 April 2024

M. Belfaiza ,
D. Rondelaud ,
M. Moncef  and
G. Dreyfuss
M. Belfaiza
Affiliation:
Laboratoire d'Hydrobiologie, Département de Biologie, Faculté des Sciences, BP 20, 24000 El Jadida, Morocco
D. Rondelaud*
Affiliation:
Laboratoire d'Hydrobiologie, Département de Biologie, Faculté des Sciences, BP 20, 24000 El Jadida, Morocco
M. Moncef
Affiliation:
Laboratoire d'Hydrobiologie, Département de Biologie, Faculté des Sciences, BP 20, 24000 El Jadida, Morocco
G. Dreyfuss
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Raymond Marcland, 87025 Limoges, France
*
*Author for correspondence Fax: 33 555 435893 Email: [email protected]
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Abstract

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Bimiracidial infections of Galba truncatula with Fasciola hepatica were carried out to determine the effect of food quality on the frequency of 1- and 2-sporocyst infections, to analyse its impact on the developmental patterns (normal, or abnormal) of redial generations, and to verify its consequences on cercarial production. These investigations were performed in snails reared at 20°C and provided with cos lettuce and commercial fish food (Tetraphyll®) as a food source until their death. Double-sporocyst infections with normal development of redial generations were recorded in 43.9% of infected snails (out of 296). Single-sporocyst infections were noted in the other snails, with normal development of generations in 53.7% and abnormal development (the first mother redia early degenerated) in 2.4%. Four successive redial generations were found in long-surviving snails (more than 90 days). In both 1- and 2-sporocyst infections, showing normal development of generations, the daughter rediae, which exited from the first mother redia (R2a rediae), constituted the greater group of free rediae and produced the highest percentages of cercariae (46.2–48.2%). However, the development of these rediae inside the snail body was slower in 2-sporocyst infections than in 1-sporocyst infections. The numbers of rediae noted in subsequent generations (R2b/R3a and R3b/R4a rediae) were similar, whatever the number of full-grown sporocysts. The number of shed cercariae recorded in the 1- and 2-sporocyst infections did not significantly differ. When long-surviving snails died, 19.8–20.7% of cercariae produced by free rediae (essentially by R2b/R3a and R3b/R4a rediae) were still present in their bodies. The increased frequency of 2-sporocyst infections demonstrated that food quality had a significant effect on the redial burden of F. hepatica developing inside G. truncatula.

Type
Review Article
Information
Journal of Helminthology , Volume 78 , Issue 2 , June 2004 , pp. 115 - 120
Copyright
Copyright © Cambridge University Press 2004

References

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