Identification of Microsporidian parasites (Plistophora sp.) in sub-adult broodstocks of Litopenaeus vannamei in Boushehr province

The aim of this study was to identify and detection of microsporidian parasite from subadult brood stock culture of Litopenaeus vannamei by histology studies and histopathological lesions examination in various organs caused of parasite. The sub-adult brood stocks (27.81±0.9 gram) were randomly sampled more than 450 pieces from greenhouse ponds of three breeding center of Bushehr province, from January to March 2014. Based on the clinical symptoms, some of shrimps were white and milky cephalothoraxes and dorsal-ventral abdominal muscles. According to wet mount and histology observations, spore of Plistophora sp were separated from infectious shrimps. Histopathological lesions of hepatopancratic infectious shrimp were including nucleus hyperthrophy of epithelial cells, change shape of B-cells, necrosis of E cells and dilation of tubules along with necrosis of muscle cells and decline of ovaries. The results showed that length and weight means of infectious shrimps comparing contamination free of shrimp were significantly deference (P