Spirulina was previously classified as an algae but is now taxonomically recognized as a cyanobacteria within the genus Arthrospira. Although still widely sold under the name 'Spirulina', the products available to aquarists are typically derived from the species A. platensis or A. maxima.
Nutritional Value and Benefits
Spirulina is a true 'superfood' for aquatic life. It is exceptionally high in protein and contains all essential amino acids, making it an excellent supplement for healthy growth. Beyond protein, Spirulina is rich in beta-carotene and other carotenoids, which act as natural color enhancers. Aquarists often observe that fish fed with Spirulina display more vibrant colors and improved immune systems due to the high concentration of vitamins and antioxidants.
Usage in the Aquarium
Spirulina is available as flake food with high concentrations of the bacteria, which is essential for herbivorous fish such as Mbuna cichlids from Lake Malawi. However, it is also an excellent nutritional boost for almost all other types of fish. For those who prepare homemade frozen foods (like shrimp mix), adding Spirulina powder is a great way to increase the overall nutrient density.
Practical Advice
While Spirulina is highly beneficial, it should be provided as part of a varied diet. For bottom-dwelling species like catfish, it is better to use tablet form to ensure the food reaches the substrate before being consumed by surface feeders.
