Studies on Some Problems Facing Intensive Fish Culture in A. R. E

Intensive fish farming seeks to production of maximum quantity offish in a minimum of water inthis method all feed is supplied artificiallyand the management of water quality is the predominant factor.In this investigation four, different intensive fish farms, El Manzala(earthen ponds), Nawa fish farm (concrete pond with continuous waterexchange), El-Tal EI-Kebeer (recycling system) and Abbassa fish hatchery,were subjected to study water parameters, mortalities and infectiousdiseases (parasitic; mycotic and bacterial) to determine the most commonproblems facing intensive fish culture in Egypt.Four different experiments dealing with study the effect of stockingdensity, rate of water exchange and degree of temperature on the growthperformance of Tilapia spp. which represent the most suitable fish forintensive fish farming in worm water in Egypt. Beside determination theeffect of stocking density on the parameters of water quality. Trials oftreatment and control of the most common problems (infectious diseases) isanother objective.The results of these investigation revealed that:- Fluctuation of water temperature in different seasons of the yeat is thefirst problem facing the investigated fish farms. Leading to highmortalities in Tilapia specially in Winter season.- Depletion of oxygen to 3.5 ppm is the second problem especially in E1-Manzala intensive fish farm.