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Journal of Biological Sciences
Year: 2018  |  Volume: 18  |  Issue: 1  |  Page No.: 39 - 45

Mass Mortality in Cultured Nile Tilapia Oreochromis niloticus in Kafr El-Sheikh Province, Egypt Due to Saprolegniosis with Emphasis on Treatment Trials

Ahmed Noor El-Deen, Hussien Mohamed Osman, Mona Saad Zaki and Hanan AlyAbo-State    

Abstract: Background and Objective: Saprolegniosis is considered the major aquatic mycotic harmful disease due to its impact on commercial fish culture. The present investigation was carried out to determine the drug of choice for treatment saprolegniosis in Oreochromis niloticus (O. niloticus). Materials and Methods: The present study was carried out on 500 cultured Nile tilapia Oreochromis niloticus in earthen fish ponds that suffered from saprolegniosis, which is considered as the most important cause of mass mortalities in cultured freshwater fish in winter in Egypt. Results: The fishes were subjected to full clinical, postmortem, identification and hematological and biochemical examination, trials also done for treatment on 240 apparently diseased O. niloticus using humic acid for control of saprolegniosis in a dose of 125 ppm for 10-12 min for 3 successive days as a bath and hydrogen peroxide was given as bath 75 μL L–1 for 10-12 min and sodium chloride was given as bath 375 ppm for 10-12 min for three successive treatments. Conclusion: The treatment of choice for saprolegniosis in affected pond was humic acid which were effective, economic and safe for fish.

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