Cladocerans are zooplanktonic crustacean which are important links between phytoplanktons and the higher trophic levels in aquatic ecosystems and they served as live food in aquaculture industry. They have a great importance in aquatic feeding larvae because of high species diversity, high level of protein, carotenoids and having larva essential digestive enzymes in early stages of nutrition and wide size range. In respect to their importance in aquaculture industry, at present research feeding behavior and ingestion rate of Guppy larva ( Poecilia reticulata ) and Flowerhorn larva while feeding by Ceriodaphnia quadrangula, Daphnia magna and nauplii Artemia franciscana were investigated under laboratory conditions. For this, two experiments including: Guppy and Flowerhorn larvae ingestion rate in two age groups of 20 and 40 days after haching; fed C. quadrangula, D. magna and nauplii A. franciscana (with 3 different densities of 2, 5 and 10 perys/ml from five treatments including; C. quadrangula, D. magna , nauplii A. franciscana, C. quadrangula and D. magna combination (1:1 in number) and C. quadrangular and nauplii A. franciscana combination (1:1 in number) in light and dark conditions were designed. Results showed that there were not significant differences between ingestion rates in light and dark conditions. Results of ingestion rate of Flowerhorn fish in different densities of five treatments showed that the maximum ingestion rates (240 preys/hour) were in the 40 days larvae with density of 10 preys /ml using nauplii A. franciscana in light condition while the minimum (0.025 preys/hour) were 20 days larva in D. magna with density of 10 preys /ml in light condition, respectively. Results of ingestion rate in Guppy fish in different densities of five treatments showed that the maximum ingestion rates (161 preys/hour) were 40 days larvae with density of 5 preys /ml using nauplii A. franciscana in light condition while minimum (0.96 preys/hour) at 20 days larva i D. magna with density of 2 preys /ml in dark condition, respectively. The weight specific ingestion of Guppy and Flowerhorn larvae fed on five treatments (prey) decreased with increasing age larva and increasing prey density. The electivity indices (E) in two fish larvae for C. quadrangula and nauplii A. franciscana combination (1:1 in number) with increasing age larva indicating lower tendency towards nauplii A. franciscana consumption and in treatment of C. quadrangula and D. magna combination (1:1 in number) always tendency towards C. quadrangula consumption. In conclusion, nauplii A. franciscana show highest ingestion rate and C. quadrangula and Nauplii A. franciscana combination (1:1 in number), C. quadrangula , C. quadrangula and D. magna combination (1:1 in number) and D. magna in two fish larvae and in two age groups shows decrease ingestion rate , respectively and could be use as a suitable live food to culture of Guppy and Flowerhorn larvae in aquaculture industry. Keywords : Cladoceran, Ingestion rate, Light and dark condition, Live food, Weight specific ingestion