This study was carried to monitor the algal bloom in Hormozgan Province costal water in 2012. The purpose of this project is to examine the changes of phytoplankton, Zooplankton, and environmental factors in this area monthly. To achieve this goal, eight sampling stations were selected in Bandar Abbass coast and three stations were selected in both port Lengeh and Jask. Physicochemical parameters of water were measured with a CTD and the minimum and maximum values were obtain for these parameters contain temperatures between 19.5 ± 0.32 and 35.34 ± 0.2 (oC), salinity between 36.8 ± 0.05 and 39 ± 0.03(p s u), dissolved oxygen between 4.75 ± 0.14 and 6.8 ± 0.2 (mg / l), pH between 7.9 ± 0.05 and 8.8 ± 0.09, chlorophyll a between 0.29 ± 0.13 and 2.97 ± 0.13 (mg/m^3). In this study 3 branches, 5 classes, 14 orders, 24 families and 42 genera of phytoplankton (including 26 genera of group Bacillariophyceae, 14 genera of group Dinophyceae and 2 genera of group Cyanophyceae) as well as 14 groups of Zooplankton populations were identified. The results of the study of phytoplankton in coastal waters of the Hormozgan province showed that in all months (with some exceptions, regardless of the dominant group have dinoflagellate) diatoms constitute the highest frequency of the dominant group. In the spring, Gymnodinium with 90% ,in summer Chaetoceros and Oscillatoria, each with a 40%, in fall Leptocylindrus and Rhizosolenia each with 71%and 26% and 33% in winter Leptocylindrus the dominant species in coastal waters of Bandar Abbas. In Port Lengeh and r Jask coastal waters Guinardia with 30% and Leptocylindrus with 39% in the Spring Nitzschia, with 69% and Rhizosolenia with 49% in the Summer, Rhizosolenia, with 57% and Gymnodinium 30% in the Autumn, and Leptocylindrus with 40% and 59% in the Winter were the dominant species in these areas.There was a significant correlation n between physicochemical parameters and total abundance of phytoplankton in all area (p〈0.5). The results showed that the seasonal variation and the percent of zooplankton were, Nauplius, 49% and Calanoida, 21% in Spring, Nauplius, 41% and Tintinnida, 28% in Summer, Nauplius 49% and Cyclopoida, 20% in Autumn and Tintinnida, 31% and Cyclopoida, 26% in Winter in Hormozgan province Coasts, in other words, the maximum percentage was belong to the crustacean group.
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