Magnificent Anemone (Heteractis magnifica) Breeding Guide

Heteractis magnifica reproduces mainly by sexual gamete transmission into the water, with rare asexual fission. Its long-lived pelagic larvae cannot be reared at home; aquarium propagation is achieved only by induced fission in specialist facilities.

Overview

Heteractis magnifica, the magnificent sea anemone, inhabits tropical and subtropical Indo-Pacific waters from East Africa and the Red Sea to Polynesia, and from southern Japan to Australia and New Caledonia. Its oral disc reaches up to about 1 metre across, with tentacles over 8 cm long arranged in concentric circles in multiples of six and an outer column coloured electric blue, green, red, pink, purple or brown. It sustains itself by photosynthesis via zooxanthellae plus prey capture, and hosts 12 anemonefish species including Amphiprion ocellaris and A. perideraion.

Reproductive Mode

Reproduction can be sexual, by simultaneous transmission of male and female gametes into the water, or asexual by scissiparity. Asexual fission occurs primarily at the rim of the distribution range rather than centrally, so sexual reproduction predominates over most of its range.

Asexual Propagation by Fission

When it does occur, asexual scissiparity splits one anemone into separate individuals, yielding genetically identical clones. Unlike the bubble-tip anemone, H. magnifica rarely splits spontaneously; aquarium propagation of this species has been achieved through deliberate fission in specialist facilities rather than as a routine home event.

Sexual Reproduction

Sexual reproduction releases gametes into the water, producing swimming planula larvae that disperse pelagically. This anemone may live for decades, with one captive individual surviving about eighty years. The long-lived pelagic larval phase means sexual reproduction is not reproduced in home aquaria.