Daphnia is a genus of small planktonic crustaceans 1–5 millimetres (0.04–0.20 in) in length. Daphnia are members of the order Cladocera and are one of the several small aquatic crustaceans commonly called water fleas because their saltatory swimming style resembles the movements of fleas. Daphnia live in various aquatic environments ranging from acidic swamps to freshwater lakes ponds streams and rivers.The two most readily available species of Daphnia are D.
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