- Small aquatic organisms, such as zooplankton and small fish that feed on algae as a primary food source.
- Larger fish species that feed on smaller aquatic organisms that have consumed algae.
- Marine mammals, such as whales and seals, that feed on fish and other marine animals that have consumed algae.
- Birds, such as seabirds, ducks, and geese, that feed on smaller fish and aquatic organisms that have consumed algae.
- Terrestrial animals, such as insects and various land-dwelling mammals, that may feed on algae that grow on land or near bodies of water.
- Certain species of turtles, such as the green turtle, that graze on algae as part of their diet.
- Some grazing animals like cows, sheep, goats and horses also consume algae that grows in ponds, lakes and other water bodies.
The consumption of algae by different organisms plays an important role in maintaining the balance of aquatic ecosystems and nutrient cycling.