Osyter Eggs - For Fish & Reef! Osyter Eggs 100g FRESH FROZEN Osyter eggs are a tiny, nutritious and very natural food for reef dwelling, filter-feeding invertebrates, including all types of LIVE CORALS. Small pieces of eggs and ovarian tissue make super food for small fish - your REEF aquarium will flourish and thrive! INGREDIENTS: Fresh Frozen Osyter Eggs, water sufficient for processing, Potassium ascorbate (source of stabilized vitamin C)