Stichodactyla gigantea (Gigantic Carpet Anemone) Breeding & Propagation Guide

How Stichodactyla gigantea reproduces: pelagic sexual spawning that is not feasible at home, and the limited asexual fission seen in sea anemones. Honest expectations for hobbyists.

Overview

Stichodactyla gigantea is a large host sea anemone of the family Stichodactylidae. According to Wikipedia, it is usually no larger than 50 cm and reaches a maximum of about 80 cm, living in shallow seagrass beds or sand flats. It maintains an obligate symbiosis with zooxanthellae and hosts seven anemonefish species, including the false clownfish Amphiprion ocellaris. It is notoriously difficult in captivity, which makes any form of intentional reproduction a fringe endeavour.

Reproductive Mode

Like other sea anemones, Stichodactyla gigantea can in principle reproduce both sexually and asexually. Wikipedia notes that in sea anemones males may release sperm to stimulate females to release eggs, with fertilization occurring in the water column or internally; the resulting planula larva drifts before settling and metamorphosing into a juvenile. No species-specific captive spawning protocol is documented in the consulted sources.

Asexual Propagation

Sea anemones can multiply asexually by longitudinal fission (pulling themselves apart into identical clones), by less common transverse fission, and by pedal laceration, in which fragments left by the pedal disc regenerate into new clonal individuals. Large host anemones such as this species divide only rarely, so deliberate asexual propagation is not a reliable hobby method.

Sexual Reproduction

Sexual reproduction is broadcast (pelagic): gametes are released into open water, and the planktonic planula larvae drift before settlement. This pelagic phase cannot be replicated in a home aquarium, so successful sexual breeding of S. gigantea is not feasible for aquarists.

Common Challenges

The species frequently dies in captivity, demanding very stable salinity, strong light and a large mature system. Because reproduction is essentially pelagic and division is rare, the realistic goal is long-term survival of a single specimen rather than propagation.