الفهرس 
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Abstract
The utilization of the algal biomass as a fish food supplement will partially offset the cost and make this process economically feasible. The present study included the nutritional quality of Chlorella vulgaris as a source of dietary protein. The following results were obtained:
I- Indoor Experiments
1-Growth response of Chlorella vulgaris at different media:
The results show clearly that the Bold’s Basal medium (BBM) increased the growth of Chlorella vulgaris, represented as dry .weight gain , cell numbers and chlorophyll ” a” content a phenomenon that was highly intensified at the end of incubation period (8 days)! At Chu no. 10 medium highly significant DROP in chlorophyll ”a” accumulation was displayed, reaching high significantly difference at 4 days.
2-Growth response of Chlorella vulgaris to various pH values:
Growth of Chlorella vulgaris after 8 days incubation showed that, pH 7 proved to be the most agreeable pH value to that strain. The algal yield as milligrams of dry weight, cell number per ml and accumulation of chlorophyll ”a” were increased by aging of culture in all pH values cultures. However, the growth was more intensive at 6 days incubation periods. The acceptable pH levels fell between 6-8 in culture of Chlorella vulgaris which show highly growth expressed as dry weight gain, cell numbbr and chlorophyll ”a” content.
3-Growth response of Chlorella vulgaris to various photoperiods:
Growth of Chlorella vulgaris in continuous light was more intense than other photoperiod cycles (10/14, 14/10 and 18/6 hours light/dark cycles), which recorded maximum production during the period of 4 days of culture age. Production of dry matter, cell count as well as chlorophyll ”a” accumulation showed maximum production in continuous light at 4 days incubation periods which showed significant difference.
4-Growth response of Chlorella vulgaris to various light intensities:
The growth of the organism represented as’ dry weight gain, cell number and chlorophyll ”a” content were increased by aging of culture in all light intensities used (3000, 5000, 7000, 9000 and 12000 lux). At 3000 lux the amount of dry weight, cell numbers and chlorophyll ”a” content were increasing until the end of incubation periods. It is also obvious that these parameters recorded their highest values at 12000 lux and reached maximum after 6 days incubation which shows high significantly differences
5-Growth response of Chlorella vulgaris to various temperature degrees:
Regarding the effect of different temperature degrees, at 25 °C the growth of Chlorella was faster than in lower temperature (15 °C) and it recorded higher dry weight, cell number as well as chlorophyll ”a” content during the course of culturing time. The relative high temperature (5 °C) led to a depression in growth of Chlorella cells indicated as low dry weight, cell number as well as chlorophyll ”a” content. Growth of Chlorella vulgaris at 20 °C was more intense than other temperatures degree, which recorded maximum production during the period of 6 days of culture age which showed significantly difference.