الفهرس 
Introduction
The 1 experimentOnly 14 pages are availabe for public view
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Abstract
This study was carried out and evaluated on two experiments by measuring and calculating fish weight, length, and K-factor; different gonadal traits, i.e. ovarian weight, length, volume, density, and index; egg number, weight, diameter, histological examination and fecundity; as well as survival rate. The 1st experiment was carried out for 71days, started from June 2009 to August 2009 at El- Hadad Farm, kafr El-Sheikh governorate (Egypt). So, this experiment aimed to study the possibility of improving catfish artificial reproduction using some commercial and local preparations. African catfish, Clarias gariepinus brood stock were divided into five treatments as following: T1: Control, without injection; T2: Injected with Pregnil®; T3: Injected with Eargent, carp pituitary gland; T4: Injected with local carp pituitary gland and T5: Injected with catfish pituitary gland. However, the 2nd experiment aimed to study the possibility of reducing cannibalism among newly hatched fry by grading. So, the chosen fry (9000, with an initial body weight of 0.38 g) from the 1st experiment was divided into three treatments as following: T1: without grading; T2: grading each 3 days and T3: grading each 7days. Each treatment has three replicates. Fry were put in 9 hapas, one thousand fry in each hapa for 4 weeks. The obtained results from this study showed that: 1- Results at the 1st experiment, revealed that T3 (injected with Eargent, carp pituitary gland) followed by T2 (injected with Pregnil®) and T5 (injected with catfish pituitary gland) were the best treatments for improving the reproduction performance of broodstock African catfish concerning highest significantly (P ≤ 0.05) of egg weight, absolute fecundity (AF) and relative fecundity (RF), blood hormones (FSH, LH and Progesterone) and ovaries histological examination than T1 (control, without injection) and T4 (injected with local carp pituitary gland). 2- Yet, results at the 2nd experiment, noted that the beneficial used of commercial African catfish hatcheries of the middle frequency of grading (T2: grading hatched fry each 3 days), which realized the best survival rate (SR%) and the highest fry body weight than without grading (T1) or grading each 7 days (T3), respectively. So, the economic efficacy (from selling the fry) could be improved by the same rate.