الفهرس 
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Abstract
from this study, and for the superiority of the 3rd treatment, it could be concluded that the fish – cum – duck integration system of production is important in producing meat duck and Nile tilapia fish under semi-intensive production system in earthen ponds. But it may gave attention to moderate stocking rate of ducks (125 - 250 duck/feddan) on fish ponds to safe water quality, particularly at low stocking rate of fish, as in the present study (16.8 thousand fry of 4 – 5 g/feddan). Artificial feeding of fish at 25% CP diet at 5 - 4% of fish biomass for 2 months, 4 - 3% for 3rd month, and 3 - 2% at the 4th month (under the integration system) realized the best results in fish growth performance, feed and nutrients utilization, total and prime fish productions with high DM content. Generally, the non integrated treatments, whether by artificial feeding or organic manure only, were the worst concerning most of the tested parameters.
This advantages besides return from ducks and their wastes recommend the integration system fish/duck to improve duck performance and composition as well as total economic return. The microbiological examination was performed for ponds water, duck wastes, fish feed, and fish organs as well. Three different bacterial groups and some pathogenic bacteria were found and counted. All these bacterial genera that found in the tested samples can be completely destroyed by high temperature used in frying and grill.