الفهرس 
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Abstract
The outbreak of diseases is a limiting factor in fish culture.
At many fish farms and hatcheries several antibiotics, vaccines, and
chemotherapeutic agents as well as some immunostimulants have been
used to prevent viral, bacterial, parasitic, and fungal diseases.
The present study was carried out to investigate the effect of nutmeg
powder and its aqueous extract on biochemical parameters , immune
parameter and the antioxidant capacity of Oreochromis niloticus.
The experimental design was conducted on two phase. Phase I, a total
number of five hundred and twenty five (525) fish were divided into
seven equal groups. G1 was fed on control diet. While, G2, G3, and G4
groups were fed treated diet contained (400, 800, and 1200 mg Myristica
fragrans aqueous extract/kg diets) respectively and G5, G6 and G7
groups were fed treated diet contained (1, 2, and 3 % of Myristica
fragrans powder) respectively for two weeks. Phase II was done after two
weeks feeding. All groups except control were divided into two
subgroups; subgroups I were continued on the same feeding regime while
subgroups II were switched to control basal diet. All subgroups were fed
for another 6 weeks. Blood and liver samples were collected at 1, 2, 4,
and 8 weeks of feeding.
The following parameters were determined:
1- The immune parameters including lysozyme, respiratory burst effect
(NBT) and IgM.
2- The biochemical parameters including total protein , albumin ,
globulin,(A/G) ratio.
3- haematochrit level .
4-The antioxidant parameters including glutatathione . S.transferase
(GST).; super oxide dismutase(SOD) and catalase.