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Feeding of Daphnia magna with two unicellular green algae, Ankistrodesmus falcatus and Scenedesmus obliquus, was investigated. The experiment was conducted in three replications and under similar condition (Z-8 medium and 14L: 10D). The results indicated that the filtration rate by D. magna decreased with increasing algal concentration, but no significant difference between the two treatments was evident (p>0.05). Increase in algal concentration resulted into significant increase in the ingestion and feeding rates of D. magna (p<0.05). The specific growth rate of D. magna fed with S. obliquus was significantly higher than those fed with A. falcatus (p<0.05); the maximum specific growth rate when fed with S. obliquus was observed in 6 mg/l. The survival rate of D. magna showed no significant difference between the two algal treatments (p>0.05). Based on the presented results, D. magna performed better when fed with S. obliquus.

Keywords: Ankistrodesmus falcatus, Scenedesmus obliquus, Daphnia magna, Ankistrodesmus falcatus, Scenedesmus obliquus, Ingestion Rate

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