plankton
Refers to the diverse collection of small organisms drifting in water, including both phytoplankton and zooplankton.
海にはたくさんのプランクトンがいる。
There is a lot of plankton in the ocean.
クジラはプランクトンを食べる。
Whales eat plankton.
When summer comes, huge amounts of plankton bloom in this bay.
Many whales live by eating plankton.
When the water temperature rises, plankton can suddenly increase.