These whole, live, Brine Shrimp are quickly frozen with CO2 "flash-freezer" and packed in unique, patented plastic cube-tray. Cubes of Brine Shrimp create an exciting display when dropped into the aquarium. As the cube slowly melts, whole Brine Shrimp slowly fall out and appear to "come alive" as they drop through the water. Tropical fish are incredibly attracted to this movement and feed on this product as if it were alive.