Red seaweed primarily grows in marine environments, specifically in intertidal and subtidal zones.
In more detail:
- Intertidal Zone: Red algae thrive in the area between high and low tide marks.
- Subtidal Zone: They can be found submerged underwater to depths of up to 40 meters, and occasionally as deep as 250 meters.
Red algae (Rhodophyta) constitute a significant portion of seaweed species, with approximately 6,500 out of 10,000 seaweed species being red algae. The vast majority of these are found in marine environments.