Spirulina is a blue green algae that contains a high percentage of protein and is ideal for juvenile and all fish. Studies show that spirulina increases growth rates and survival rates, aids digestion and brightens body color. This product was made in the US has a minimum protein content over 56% and is nutrient and mineral dense containing Iron, Calcium, Carotene, Phycocyanin. This is suitable for all fish. Please contact us with any questions.