This study is a part of the project of Protecting Bahr Shebeen Canal and Procedures for Developing its Fishery Resources. Oreochromis   niloticus is the main fish caught in that canal. Its biological characters; such as growth in length, length-wight relationship, gonadosomatic index, stomachsomatic index, were studied. Certain irregularities in reproduction and feeding were noticed, and attributed to climate change, as the year 2015 was announced to be the most hot year in 137 years. Fish mortality, as well as the average age or length of the fish in the catch, indicated that fishing is concentrated on the third year (2.67 yrs) of life of the fish, or 13.3 cm in length.  Those findings are discussed and accordingly, recommendations were given.