Myxosoma tilapiae as a new species [Myxozoma: Myxosporea] in wild oreochromis niloticus in lower Egypt

ABSTRACT

From examination of 1328 wild 0. nilolieus [Tilapia nilotica], macroscopic and microscopic cysts were detected on the skin, gills, eyes, hepatopancreas and kidneys. Eye affection was in the cornea and splenic affection was either of the ordinary cyst forming type or of the non cyst forming type. The latter was characterized by paleness of the involves splenic part. Impression smears revealed the detection of Myxosoma spores, which were compared and discussed in details with other myxosporideans, and was considered as Myxosoma tilapiae n.sp. The spores obtained from different organs were similar in morphological status. Quantitative data on the prevalence and distribution of Myxosoma cysts was studied