The carbohydrate content of Nannochloropsis sp. and Tetraselmis sp. in response to 20, 30 and 40 ppt salinities under natural and control condition was shown in Fig. 9. Results showed that there was no significant difference (p > 0.05) between the different salinities for Nannochloropsis sp. when cultured in control condition. On the other hand, Tetraselmis sp. cultured in both natural and control condition at 30 ppt had significantly higher (p < 0.05) carbohydrate when cultured in 30 ppt compared to 40 ppt. But therewas no significant difference between 30 and 20 ppt. At 20, 30 and 40 ppt, Nannochloropsis sp. accumulated significantly higher carbohydrate content as compared to Tetraselmis sp.At another perspective, accumulation of carbohydrate in natural and control condition was apparent. Tetraselmis sp. and