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As large numbers of metacercariae of  Fasciola hepatica  are necessary for research, experimental infections of  Galba truncatula  and  Pseudosuccinea columella  with this digenean were carried out to determine the better intermediate host for metacercarial production and, consequently, the most profitable snail for decreasing the cost price of these larvae. Pre-adult snails (4 mm in shell height) originating from two populations per lymnaeid species were individually exposed to two or five miracidia, raised at 23 °C and followed for cercarial shedding up to their death. Compared to values noted in  G. truncatula , the survival of  P. columella  on day 30 post-exposure was significantly greater, while the prevalence of  F. hepatica  infection was significantly lower. In the four  P. columella  groups, metacercarial production was significantly greater than that noted in the four groups of  G. truncatula  (347–453 per cercariae-shedding snail versus 163–275, respectively). Apart from one population of  G. truncatula , the use of five miracidia per snail at exposure significantly increased the prevalence of  F. hepatica  in  P. columella  and the other population of  G. truncatula , whereas it did not have any clear effect on the mean number of metacercariae. The use of  P. columella  for experimental infections with  F. hepatica  resulted in significantly higher metacercarial production than that noted with  G. truncatula , in spite of a lower prevalence for the former lymnaeid. This finding allows for a significant decrease in the cost price of these larvae for commercial production.

Fasciola hepatica: comparative metacercarial productions in experimentally-infectedGalba truncatulaandPseudosuccinea columella