ミジンコ

noun

water flea; Daphnia

Small freshwater crustacean of the genus Daphnia, often used as fish food or observed under a microscope. The word is usually written in katakana.

• 池いけの水みずを顕けん微び鏡きょうで見みると、ミジンコがたくさん泳およいでいた。

  When I looked at the pond water under a microscope, many water fleas were swimming around.

• 金きん魚ぎょの餌えさに乾かん燥そうミジンコを与あたえている。

  I feed dried water fleas to my goldfish.