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Abstract
The present work was carried out on freshwater 249 fish (106 and 143) diseased Nile Tilapia (O.nilotcus) and African catfish (C.gariepinus) respectively; collected from different aquacultures and different locatities in Kafr El-Sheikh governorate and at different seasons examined mycologically, the results showed that
• A total of 1592 mycotic isolates were recovered from the examined fish.
• The isolated fungi belonged to 7 genra: Penicillium, Aspergillus, Mucor, Trichoderma, Paecilomyces, Saprolegnia and Fusarium and 3 genra of yeasts. Rhodoterulla sp., Candida sp. and Cryptococcus sp.
• The frequency of isolation of mycotic isolates were 39.8% and 60.1% isolates from Nile Tilapia and African catfish respectively.
• The percentage of mould isolates were 86.75 and 81.1% while as the yeast isolates percentage were 13.24 and 18.89% from Nile Tilapia and African catfish respectively.
• The percentage of isolated identified moulds were; Penicillium sp. (15.93 and 13.15%), Aspergillus sp. (45.26 and 36.21%), Mucor sp. (4.57 and 94%), Trichoderma sp. (5.05 and 9.08%), Paecilomyces sp. (1.57 and 3.31 %), Saprolegnis sp. (11.82 and 3.54%) and Fusarium sp. (2.52 and 3.02%) from Nile Tilapia and African catfish respectively.
• The obtained identified yeast isolates were, Rhodoterulla sp. (9.31 and. 12.11%), Candida sp. (3.31 and 6.47%) and Cryptococcus sp. (0.63 and 0.31%), from Nile Tilapia and African catfish respectively.
• The identified Aspergillus isolates revealed, A. niger (21.92 and 20.98%), A. flavus (21.14 and 14.41%), A. ochraceus (1.1 and 0.83%) and A. clavatus (1.1 and 0.0%) from Nile Tilpia and African catfish respectively .
• Saprolegia sp. and Mucor sp. were isolated at a high rate from the skin of Nile Tilapia while as in African catfish the skin was the target organ for Penicillium sp. only. Penicillium sp., A. niger, A. flavus and Fusarium sp. from Nile Tilapia and Mucor sp. Saprolegnia sp. and Fusarium sp. from African catfish were isolated with a high rate from fins. In addition the gills were the target organ for A. ochraceu and Trichoderma sp. in Nile Tilapia and for A. niger, A. flavus, A. ochraceus and Trichoderma sp. in African catfish. A. clavatus and Paecilomces sp. from Nile Tilapia and Paecilomces.