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Bandar-e Būshehr, Iran

Pazir M.K.,Iranian Shrimp Research Center | Afsharnasa M.,Iranian Shrimp Research Center | Niamaymandi N.,Iranian Shrimp Research Center | Khadem H.,Iranian Fisheries Research Organization | And 2 more authors.
Asian Journal of Animal Sciences

This study was conducted to identify White Spot Syndrome Virus (WSSV) and Infections Hypodermal and Hematopoietic Necrosis Virus (IHHNV) by using clinical and histopathological sings of cultured shrimp, Litopenaeus vannamei in Bushehr farms, from December 2009 to April 2010. Samples were collected from Bushehr shrimp farms and hatcheries. Based on histopathological and gross signs, two viral diseases, WSSV and IHHNV have been detected. The gross signs of WSSV in the moribund samples showed reduced feeding, lethargy, difference in size, reddish coloration of appendages and white plaque on the carapace, while the gross sign of IHHNV exhibited abdominal dorsal changes of the muscles, opaque or milky spot on the cuticles, rostrum deformity syndrome and abdominal segmental abnormalities. The histopathological observations of WSSV showed basophilic Cowdry type A inclusion bodies in all tissues such as gills, haematopoietic tissue, cuticle epithelium, lymphoid organ and connective tissue. However, histologically, the hepatopancreas tissue showed vacuolization of B cells, without inclusion bodies. The histopathological signs observed such as hypertrophy, cellular degeneration and eosinophilic Cowdry type A inclusion bodies in the cells nucleus hepatopancreas, gills, haematopoietic, cuticle epithelium, digestive epithelium, lymphoid organ and connective tissue. Also, histopathological change of the striated muscles of the affected abdominal segmental abnormality showed severe Zenker's necrosis. © 2012 Knowledgia Review, Malaysia. Source

Kakoolaki S.,Iranian Fisheries Research Organization | Sharifpour I.,Iranian Fisheries Research Organization | Sharifrohani M.,Iranian Fisheries Research Organization | Ebrahimzadeh Mousavi H.A.,University of Tehran | And 4 more authors.
Iranian Journal of Fisheries Sciences

Certain parasites can cause severe diseases in shrimp. Among these, protozoa are very important. The objective of our study was to describe the signs, prevalence, and intensity of hemocytosis, a new disease in shrimp, Fenneropenaeus indicus. The experimental design included three groups, one treatment as infected shrimp or group B and 2 controls with non-infected but exposure to White Spot Syndrom Virus (WSSV) shrimp as group A and non-infected non-exposure to WSSV shrimp as group C in triplicate. The results revealed that Hemocytosis associated with a decrease in hyalinocytes and large-granulocytes (less than 8%) and a considerable increase in semi-granulocytes in group A and B in contrast to group C that Hyalinocyte increased. This infection made the shrimp susceptible to WSSV disease. It is believed that Hemocytosis causes a condition which can result in a rapid mortality among susceptible species, F. indicus when exposure to WSSV is occurred. Source

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