1.7M views · 10K reactions | Coral reefs function as cosmopolitan cities where sea animal partnerships thrive. [VID: Compilation footage of coral reef underwater] | Nature | PBS | Facebook

Corals can reproduce asexually, through a process called "fragmentation". If a branch breaks away and falls onto the reef, it can reattach and begin to grow a new colony. We use this natural process to efficiently propagate tens of thousands of reef-ready corals each year! ​We fragment coral colonies into smaller, finger-sized pieces. These smaller fragments are then hung on Coral Trees™ - a simple PVC design that we developed, that allows us to grow huge numbers of coral fragments in large, off