Golden algae, also known as chrysophytes, is a group of algae that are characterized by their golden or brownish coloration, which is due to the presence of yellow or brown pigments in their cells. These algae are found in both freshwater and marine environments, and they can be either unicellular or multicellular.

Golden algae are important primary producers in aquatic ecosystems, as they use photosynthesis to produce organic matter that can be consumed by other organisms. However, some species of golden algae can also produce toxins that can be harmful to other aquatic organisms, especially fish.

In addition to their ecological role, some species of golden algae have also been studied for their potential use in biotechnology and bioengineering. For example, some researchers are investigating the use of golden algae as a source of biofuel or as a platform for the production of pharmaceuticals.