The proximate composition of brown seaweed Sargassum lentifollium was investigated in this study along with analysis of some physicochemical parameters of Chabahar Bay water. The relationship between the nutritive components of this species and environmental parameters was established. Crude protein content varied from 8.05±1.15% of dry weight to 12.29±1.10%, carbohydrate from 31.11±2.03% to 25.11±2.13%, humidity from 15.21±1.00% to 19.22±1.11% with differences significantly before and after monsoon seasons, respectively while ash content varied from 26.11±2.43% to 24.11±1.40%, total fat from 2.11±0.43 % to 1.80±0.40% , total fiber from 10.34±2.21% to 11.84±0.33% and astaxantin content (ppm) from 104.11±1.00 to 97.20±1.18 before and after monsoon season respectively without any significant differences(P>0.05). Regarding to physicochemical parameters of sea water, the result showed there are differences between salinity, dissolved oxygen, water temperature, nitrate, phosphate, chlorophyll a and c before and after monsoon season significantly while there are not in pH, silicate and chlorophyll b. Statistical analysis computed among the environmental and biochemical parameters suggested the potential role played by the abiotic parameters on biosynthetic pathways of seaweed
