Acropora caroliniana Propagation Guide

Propagating Acropora caroliniana, a bottlebrush SPS coral with dense lateral corallites, by fragmentation: cutting branch tips, mounting frags, and the stable chemistry, high light and flow fragments need.

Overview

Acropora caroliniana is a bottlebrush stony coral in the family Acroporidae with dense lateral corallites along its branches. Like other Acropora it grows as a colony of small polyps that share tissue and build a calcium carbonate skeleton, with symbiotic Symbiodinium algae generating energy through photosynthesis. Its dense bottlebrush branches are fragged at the tips like other SPS corals.

Reproductive Mode

Acropora reproduce sexually through gamete release and asexually when broken branches reattach and grow into new colonies. Aquarium propagation uses fragmentation because each frag carries the parent's genetics and resumes growth once secured.

Fragging / Asexual Propagation

Select a healthy, well-coloured branch tip from an established colony.
Cut or snap the branch with bone cutters or a saw, keeping the break clean.
Glue the frag to a plug or rock with cyanoacrylate or epoxy.
Set the frag in moderate light and flow until tissue grows over the cut, then raise it.
Dip and quarantine new frags before introducing them to a display.

Under good reef conditions, finger-sized fragments can grow into much larger colonies within one to two years, so a single parent supplies many bottlebrush frags over time.

Conditions for Propagation

Fragments need stable conditions to heal. Acropora are especially prone to bleaching when stressed, caused by the loss of their zooxanthellae, so steady temperature, salinity, alkalinity, calcium and magnesium are critical. High light and high flow drive the dense skeletal growth this branching form needs.

Sexual Reproduction

In the wild, Acropora participate in annual mass-spawning, releasing gametes into the water for external fertilisation and larval development. This is rarely seen in home aquaria, so hobby propagation depends on fragmentation.