Corals can reproduce in two ways; spawning or by asexual means. Spawing occurs when all the corals in a particular area release their eggs and sperm into the water. Once the sperm and egg fertilize, a planula is formed. After floating up towards the light and drifting for several weeks, the panula finally comes to rest on a solid foundation and develops into polyps.

Jellyfish reproduce by spawning. The panula also attach themselves to a hard surface and each polyp produced from a panula has the ability to produce new polyps in a process called budding.

Sea anemones reproduce by producing eggs and sperm, which, when fertilized, become free-swimming larvae. They have the ability to produce, from their side, an identical animal, which then becomes separate. This process is called lateral fission.