Animals such as sponges and colonies of corals fragment and reproduce naturally. This method reproduces many species of annelids and flatworms.
Many types of coral colonies can increase in number through natural or artificial fragmentation. Enthusiasts regularly fragment corals within in order to reef aquarium hobby for a variety of purposes including shape control; selling, trading or sharing with others; regeneration experiments; and minimizing damage to natural coral reefs. It is possible to fragment both hard and soft corals. Among many others, Acropora, Montipora, Pocillopora, Euphyllia, and Caulastraea have shown to be highly tolerant of fragmentation. Most marine anemones reproduce through fragmentation. Longitudinal fission, where the original anemone splits through the center, forming two anemones of equal size and basal laceration, where small parts of the animal split from the base and form a new anemone.