الوصف

This current study was applied for investigating the presence of Pseudomonas species bacteria from cultured marine shrimp (Litopenaeus vannamei) collected from the Suez Governorate randomly and seasonally during the period from March 2020 to November 2020. Our results revealed that the suspected isolated bacteria, was identified as Pseudomonas fluorescence depending on both morphological and biochemical characters using traditional as well as API20E commercial tests. The clinical signs appeared on the infected shrimp were melanization on the body surface and darkening of appendages tips, inflamed tail, rostrum deformity, darkened gills and paleness of hepatopancreas. The total prevalence of Pseudomonas infection was 17.33%, while the highest seasonal prevalence was recorded in the summer season (20%) followed by autumn season (18%) and the lowest percent was the spring season (14%). The histopathological examination revealed the presence of haemocytic filtration, sloughing hepatopancreas cells, necrotic inflammation, haemocytic plug, broken musculature and epithelial edema. We concluded that higher temperature is the predisposing factors for Pseudomonas infection.

URL

DOI

https://doi.org/10.21608/scvmj.2022.258072

الملخص

الكلمات الدالة

API20E, Litopenaeus vannamei, Pseudomonas fluorescens