Common name: Berghia Nudibranch

General information

The Berghia Nudibranch, scientifically known as Berghia stephanieae, is a species of sea slug that belongs to the Aeolidiidae family. These nudibranchs are particularly sought after in the reefkeeping hobby for their ability to control Aiptasia, a type of pest anemone that can overrun saltwater aquariums. They are small, with adults reaching up to 2 centimeters in length, and have a distinctive white to pale yellow body with cerata (finger-like appendages) that may have purple tips.

Care

Berghia Nudibranchs are specialist feeders, consuming only Aiptasia anemones. This diet makes them an excellent biological control method for these pests. However, it also means that once the Aiptasia are eliminated, Berghia Nudibranchs may starve unless more Aiptasia are introduced or they are moved to another tank with a pest population. They thrive in stable aquarium conditions with ample live rock for hiding and hunting.

Reproduction

These nudibranchs are hermaphrodites, meaning each individual possesses both male and female reproductive organs. They can mate with any other mature individual, and both partners will lay egg masses after mating. The eggs hatch into free-swimming larvae that will eventually settle and metamorphose into the adult form, provided there is a food source of Aiptasia available.

Habitat

In the wild, Berghia stephanieae is found in the Western Atlantic, including the Caribbean and the Gulf of Mexico. They inhabit shallow reef environments where Aiptasia anemones are present.