Ascophrys rodor (Campillo and Deroux) parasite of the reared common prawn P. serratus).
1975
Deroux, G. | Campillo, Albert | Bradbury, Ph. C.
A disease whose severity seems directly bound to conditions of cultivation can cause a heavy mortality in the common prawn Palaemon serratus (Pennant) at molting. The causative agent, A. rodor, is a ciliate, a common external parasite whose life cycle is adapted to the molting cycle of the shrimp. The principal factors favorable to the development of the parasite were studied: age of the host, water temp, numbers of shrimps as a function of the quantity of water and its renewal. The sp A. rodor, although related to the Conidophryidae, Kirby, 1941 (1936) has significant differences (1) in its ethology (it feeds on the exoskeleton without penetrating to its hosts' tissues), (2) in its vegetative multiplication (tomitogenesis combines the cortical multiplication of infra-cilliary anlagen by a classic pattern of bipartition and a cellular segmentation intermediate between budding and palintomy). The cytoplasmic and cortical structure of the migratory infective forms (tomites) relate Ascophrys not only to be Conidophryidae but also to the gen Askoella Fenchel, 1965 and probably to the Apostomatida.
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