AQUATIC PHYCOMYCETES RECOVERED FROM ASWAN-HIGH-DAM LAKE [AHDL]

Twenty five identified and four unidentified species belonging to elev en genera of aquatic phycomycetes were recovered from one hundred and thirty surface water samples which were collected mainly from Aswan Hi gh Dam Lake (100 samples) in addition to few samples from Aswan reserv oir (10 sample) and the main stream of the River Nile at Aswan (20 sam ples) during the period from January to June, 1992. The richest water samples in aquatic phycomycetes species were those characterized by re latively low temperatures (15.9 degrees C - 20.3 degrees C) and pH ran ged between 7.4-8.3. The poorest samples were characterized by relativ ely high temperature (20.6 degrees C - 33.1 degrees C). pH values fluc tuating between 6.3 and 9.2, dissolved oxygen varying from 4.5 to 10.6 mg/L, total soluble salts ranging from 149 to 303 mg/L and the organi c matter content between 2.0 and 51.1 mg/L. Saprolegina and Pythium we re the most frequent aquatic fungal genera recovered during this inves tigation whereas Aphanomyces, Dictyuchus, Pythiopsis, Leptomitus, Allo myces and Blastocladiopsis were less frequent.