Background:Chaetogaster limnaei is an annelid symbiotically associated with lymnaeid snails as Galba truncatula. This association is considered a preventive mechanism against trematode miracidia infection, including Fasciola hepatica. The objective of this study was to determine the effectiveness of Chaetogaster limnaei as a natural controller of Fasciola hepatica in laboratory conditions.Procedures:Fascsola hepatica miracidia were inoculated in parallel into snails carrying Chaetogaster limnaei and snails without the annelid. The degree of infection was measured after 40 days of exposure. Furthermore, the number of annelids per snail was quantified, as well as the ability of Chaetogaster limnaei to devour miracidia at different times of exposure.Results:An effective 70% natural control of Fasciola hepatica in Galba truncatula was observed. The carrying capacity of the snail was established to be of 10.6 ± 1 annelids. Chaetogaster limnaei is a predator of Fasciola hepatica devouring an average of 3.79 ± 0.21 miracidia. The results of these experiments have a potential value as a control measure against fascioliasis in the environment.
Fasciola hepatica tiene un ciclo biológico complejo, que incluye un caracol limneido como intermediario, donde acontece su multiplicación larval partenogenética. Se realizó por ello un estudio experimental del ciclo de F. hepatica y se estimó su potencial biótico (r) en Galba truncatula. Habiendo seleccionado 215 de estos caracoles para su infección con miracidios obtenidos a 26°C, en presencia de luz; se procedió a la disección de cinco caracoles cada tres días, realizando el seguimiento de la cuantía de estadíos de F. hepatica mediante microscopía de campo claro, observando características externas y tiempo de desarrollo de miracidios, esporocisto, redias y cercarias. Resultando que el modelo de crecimiento exponencial es el que mejor se ajusta a la dinámica de F. hepatica, con un potencial biótico de 6,69%, una media de 203 cercarias por miracidio y 270 cercarias por caracol.
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