From the Greek rhéos - current, stream and Biont.

Rheobiont - hydrobionts living in flowing waters (taimen, lenok, sturgeon, etc.).

Rheophilic animals, organisms adapted to live in flowing waters such as rivers, streams, shallow marine waters with tidal or constant currents. Some rheophilic animals spend their entire lives in flowing waters, while others are associated with them only during certain periods, such as larvae of some mayflies, brookworms and other insects, passage fish. Many of them - attached or sedentary forms - are able to resist the current by growing or attaching to the substrate (sponges, bryozoans, many mollusks, some echinoderms). Many rheophilic animals are filter feeders.