CEPAVE   05420
CENTRO DE ESTUDIOS PARASITOLOGICOS Y DE VECTORES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Effect of temperature-photoperiod and flooding-desiccation factors on hatching pattern of the eggs of Strelkovimermis spiculatus (Nematoda: Memithidae) under culture conditions.
Autor/es:
MICIELI, M. V.; RISSO, P.; ACHINELLY, M. F; VILLAR, M. DE LOS M.; TARQUINI, J.
Lugar:
Halifax
Reunión:
Congreso; International Congress on Invertebrate Pathology and Microbial Control, OECD Symposium on Disease in Aquatic Crustaceans & 44th Annual Meeting of the Society for Invertebrate Pathology.; 2011
Institución organizadora:
Society of Invertebrate Pathology
Resumen:
We assessed the number of Strelkovimermis spiculatus preparasites obtained from an initial known number of nematode eggs and how some abiotic factors (temperature- photoperiod, flooding-diseccation) could affect the number of emerged preparasites. Two groups of eggs, one maintained flooded and other under different number of flooding-diseccation events (each 15, 30 and 60 days), were performed. Each group of eggs was also studied under two conditions:  25º C and 14:12 (L:D) photoperiod, and at 16º C and 12:12 (L:D) photoperiod. When eggs were maintained flooded a higher total percentage of S. spiculatus preparasites was reported compared to treatments subject to drying-flooding cycles. The maximun percent of J2s emerged was found in the treatments maintained flooded at 16º C and 12:12 (L:D) photoperiod (30 ±  15.04 %). Preparasites were observed from 7 (25º C) and 14 (16º C) days suggesting this period as the minimun time for embryonic development. The period of time over which preparasites coming from the same batch of eggs were observed in flooded assays (98 and 112 days at 25ºC and 16ºC, respectively) suggested a nonsychronous hatching of nematode eggs possibly due to non uniform embryonation of eggs.  The time of exposure of the assays todrought conditions no affected significantly the total average percentage of J2s obtained at 25º C and 14:12 (L:D) photoperiod, although at 16 ºC floods every 15 days showed the highest percent of emerged J2s. A schedule of flooding to optimize the mass rearing method for S. spiculatus is proposed.