V20 Foods Frozen Reef Caviar is taken from Capelin fish in the pure waters of Iceland's North Atlantic Ocean and harvested in March for optimal freshness. Caviar is an excellent source of vitamins and minerals, especially omega 3 fatty acids. This is easily consumed by reef aquaria, filter-feeding invertebrates, small butterflies, angels, wrasses and mandarins. The beneficial nutrients this diet offers will encourage the best possible health for your aquarium fish.