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

Published online by Cambridge University Press:  12 April 2024

P. Vignoles ,
G. Dreyfuss  and
D. Rondelaud
P. Vignoles
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Marcland, 87025 Limoges Cedex, France.
G. Dreyfuss
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Marcland, 87025 Limoges Cedex, France.
D. Rondelaud*
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Marcland, 87025 Limoges Cedex, France.
*
*Author for correspondence Fax: 33 5 55 43 58 93, E-mail: [email protected]
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Abstract

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Experimental 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.

Type
Research Article
Information
Journal of Helminthology , Volume 76 , Issue 3 , September 2002 , pp. 269 - 272
Copyright
Copyright © Cambridge University Press 2002

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