Sea sponges are simple multi-cellular aquatic animals, marine for the most part, that constitute the phylum “Porifera” (meaning ‘pore-bearer”). They are very primitive organisms with bodies full of pores and channels, which allow the water to circulate through them. There are 5,000 to 10,000 species inhabiting all seas and raging from tidal zones to depths exceeding 8,800 m.
They are stuck to the floor in the oceans, seas, and even rivers and most of them feed on bacteria and other food particles that they capture in the water. A few species of sponge, living in very food-poor environments, have become carnivores that feed mainly on small crustaceans. Sponges grow in all different shapes, sizes, colors, and textures.