الفهرس 
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Abstract
This study was carried out through the cooperation protocol between the Animal and Fish Production Department, Faculty of Agriculture, Alexandria University and Fish Production Research Development Unit Americana Group, Al-Nubaria city, 120 Km North-West Cairo to study the effects of replacing (0, 5, 10, 15, 20, 25 and 30%) of the dietary fish meal (FM) protein with worm African Night Crawler ANCWM (E. Eugeniae)
meal, protein and Red Wigglers worm meal RWWM (E. fetida) in diets of Nile tilapia on growth performance, feed utilization , carcass composition , physiological criteria and
economic evaluation of Nile tilapia, Oreochromis niloticus fingerlings.
Fish with an initial body weight of 7.71 ± 0.06 g at 25 fingerlings /m3 in
Recirculating Aquaculture Systems, RAS were hand-served with an isonitrogenous (30 % crude protein) and isocaloric diets twice daily at a decreased rate of 10, 6, and 3% within 90 days experimental period.
Results of the present study are summarized as following:
1. Chemical analysis of FM, ANCWM and RWWM FM had the highest protein and minerals contents as well as the lowest lipid content.
Protein content of ANCWM and RWWM are quite reasonable (40.35 and 37.55 %,
respectively).
2. Water characteristics
During rearing period, water properties were within the optimal ranges for Nile
tilapia as temperature were 28.49 and 28.41oC; pH were 8.44 and 8.60; DO were 7.04 and 6.78 mg/L; NH4 were 0.02 and 0.002 mg/L for the first and second experiment respectively.
3. Growth parameters, nutrient utilization, and condition factor (First experiment) Fish fed on diet (5) that contains ANCWM protein instead of 20% crude protein of fish meal showed better growth variables (final body weight, weight gain, SGR), nutrient
utilization [Feed intake (g/fish), feed conversion ratio, protein efficiency ratio, protein productive value (%), and energy utilization (%)], and condition factor (K). Fish fed on diet (7) with 30% fishmeal substitution displayed the poorest performance for the previous
parameters.
4. Whole body proximate analysis (First experiment) No significant differences (P>0.05) in the final whole body proximate compositions (dry matter, lipid content and energy content) except for the body protein and ash contents.
Whole body protein of fish fed diet 4 and 5 which contain 15% and 20% protein African Night Crawler worm meal obtained the highest protein contents (58.65 and 58.90%) meanwhile fish fed on the basal diet had lower protein content (57.45%). Fish fed diet (3) the lowest ash content (17.5).
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5. Growth parameters, nutrient utilization, and condition factor (Second experiment) Fish fed on diet (11) that contains RWWM protein instead of 20% crude protein of fish meal showed better growth variables, nutrient utilization, and condition factor (K).
Fish fed on diet (13) with 30% fishmeal substitution displayed the poorest performance for the previous parameters.