The planktonologist spent the afternoon examining samples under the microscope, searching for unusual diatoms.

The planktonological survey revealed unexpected seasonal shifts in the composition of microscopic communities.

During the summer bloom, the algae spread planktonicly throughout the bay, carried by gentle currents.

The planktonologists spent the summer aboard the research vessel, cataloging dozens of new microalgae species.

Many planktonophagous fish migrate vertically each day to follow the abundance of their microscopic prey.