الفهرس 
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Abstract
Algae have been traditionally regarded as simple plants ranged from unicellular to
multicellular organisms. As an example of micro-algae Dunalielta salina is a genus of
unicellular green algae belonging to the Phylum: Chlorophyta, Class: Chlorophyceae,
order: Volvocales, Family: Dunaliellaceae. Dunaliella is common in marine waters
especially in sea salt fields but with exceptional morphological and physiological
properties (Sadka et al., 1991). This organism is relatively simple to cultivate and do not
clump or form chains. Also, Dunaliella salina is considered as one of the few species of
microalgae which can be mass cultured outdoors (Garcia-Gonzalez et al., 2003), including
semi intensive systems in hyper saline lakes (Ben-Amotz 2004). The reason for that lies in
its wide halo tolerance range, which allows the use of hyper saline culture medium not
suitable for the growth of other organisms. Only under extreme culture conditions, such as
high salinity, it is possible to minimize contamination of mass culture with opportunistic
species or other organisms.