hydrobiologist
/ˌhaɪdroʊbaɪˈɑlədʒɪst/
noun
- A scientist who studies life in water, such as in lakes, rivers, or oceans.
- As a hydrobiologist, she specializes in freshwater fish populations.
- The hydrobiologist collected samples from the stream to check for pollution.
- The team of hydrobiologists discovered a new species of plankton.