Study on parasitic infestation on Persian sturgeon (Acipenser persicus) larvae and fingerlings in the Shahid Dr. Beheshti Hatchery
Subject Areas : New Technologies in Aquaculture Development
Keywords: Diplostomum spathaceum, Persian sturgeon, Keywords: Parasite, Trichodina reticulate,
Abstract :
Abstract The present study was conducted to identify the parasitic infestation in two phases on Persian sturgeon, Acipenser persicus, larvae and fingerlings in the Shahid Dr. Beheshti Hatchery in spring & summer 2007. In the first phase of this study, a total of 300 specimens of larvae were collected on five days after the onset of exogenous feeding. The second phase was conducted with 300 specimens collected from five earthen ponds, which included 150 larvae collected one week after stocking and 150 fingerlings collected at the time of their release into rivers. The specimens under study were measured and their biometric characteristics were recorded. Wet slides from the external and internal surface were prepared and parasites were identified following standard methods. No parasites were observed in the sturgeon larvae on 5 days after the onset of exogenous feeding. However Trichodina reticulata were observed in the larvae in the first week (prevalence = 20% - 30%; Intensity range = 2-10). At the time of their release into the river, in addition to Trichodina reticulata (prevalence=56.67% –100%; Intensity range=5-680) a Digenea Terematoda, Diplostomum spathaceum (prevalence = 3.34% - 6.67%; Intensity range =1-2) were also observed in the sturgeon fingerlings. Significant differences (T-test) were detected in the intensity of Trichodina reticulata during the first week after stocking in earthen ponds and the time of their release into river.
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