Marine microalgae constitute a natural source of a variety of drugs for pharmaceutical, food and cosmetic applications which encompass carotenoids, among others. In this study the inducible effect of K2HPO4 on the accumulation of some apo carotenoids includes, a and b types chlorophyll, beta carotene, astaxanthin, lycopene and pheophytin were conducted on five treatment and three replication under CRD design. cellular extracts were extracted with DMSO solvent. analysis of the obtained data through spectrophotometric absorbtion for which studied metabolites have done by GeneStat 12.1 statistical software and the grouping of means on 5% probability level (P<0.05) performed via duncan's test. The result showed significant difference between treatments. the metabolites content in cellular extracts on stationary phase of algae calculated in highest level of 4/5 and 3/588 (mg/g) for chlorophil a and beta carotene respectively in fifth treatment level. Also astaxanthin and lycopene was 1/505 and 2/84 (mg/g) respectively in second treatment. There was none significant differences between the chlorophyll b and pheophytin pigments compare to control.
