الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The fish is considered as economically important, since they are a good source of human protein. As a result of, increasing the demand of fish, the world towards to mariculture to increase the total yield of Since 1928, Mullet fry (Mugil cephalus; Liza ramada; Liza lens; and Liza aurata) were introduced to Lake Qarun. Lake Qarun is lated habitat and so, it is absolutely not favorable for breeding of Jult mugilids. So, all Mullet species have to be transplanted annually -maintain their stock in the lake. In the last decade, the total yield of fishes was decreasing. Liza ramada were chosen in this study. This study included the following studies:
- Study the reproductive biology by studying sexual maturity of gonads breeding season, gonado-somatic index (GSI) and egg diameter. istological Studies of gonads to give background about the seasonal hanges in oogenesis and spermatogenesiS.
2- Determine the level of sex steroid hormone levels in the plasma during maturation stage in both male and female fish.
3- Determination the optimum environmental conditions (temperature, photoperiod and salinity) for reproduction and induced spawning of L. ramada by using intramuscular injection with Human Chorionic Gonadotropin (HOG). 4- Distribution of ova and mullet fry spp. in Lake Qarun. 5- Feeding behavior of L. ramada fry in Lake Qarun. The monthly fluctuation of the GSI of both sexes so far agrees with the monthly variation of maturity stages.