الفهرس 
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Abstract
Sea bream and Sea bass brood stock used in the present study were collected from Manzala Lake
and some privet fish farms in Damitta govemorate. This study shows the possibility of Sea
bream induced spawning in captivity at different temperature 18, 19, 20 0 C by exposing to
program of temperature and photoperiod to complete the maturation and spawning. The results
showed that fertilized eggs and hatching rate as well as the care of the larvae after hatching and
estimate the survival rate of fries. During, this study the spawning season of Sea bream was
provided to start in October, rather than December. The best results of fertilization rate, hatching
rate and survival rate for the treatment of 18 0 C followed by the treatment of 19 0 C. The second
part of the study shows the possibility of Sea bass spawning and complete the maturation of
gonads in captivity by hormonal injection. Sea bass brood stocks were injected into three
treatments, hCG, LHRH and LHRH+hCG. The results showed the brood stock maturity, quantity
of the produced eggs, fertilization rate, latency period, time of releasing eggs and the mortality of
the fish after hormone injection. The best results of the amount of fertilized eggs for the
treatment of hormone (LHRH) and the best result of non-fertilized eggs, fertilization rate for
treatment of (hCG + LHRH) and the poorest results for the treatment of hormone (hCG).
I Keywords: Sea bream, Sea bass, Spawning, Hormone, Temperature, photoperiod