Common name: mottled sea hare

General information

The Sooty Sea Hare, scientifically known as Aplysia fasciata, is a large and distinctive sea slug found in the Mediterranean Sea and the eastern Atlantic Ocean. This species is known for its dark coloration, which can range from brown to black, and its impressive size, with some individuals growing up to 40 centimeters in length. Sea hares are named for their rabbit-like appearance, with a pair of rhinophores that resemble ears.

Care

In the aquarium, Aplysia fasciata requires a spacious tank with plenty of live rock and algae for grazing. They are peaceful creatures and can be kept with other non-aggressive tank mates. It's important to maintain high water quality and stable parameters, as sea hares can be sensitive to changes in their environment. They are herbivores and will feed on a variety of algae, but may also accept prepared foods that are rich in vegetable matter.

Reproduction

Sooty Sea Hares are hermaphrodites, possessing both male and female reproductive organs. They can form mating chains where one individual acts as a male to the one in front and as a female to the one behind. Spawning events can result in the release of large amounts of eggs, which are laid in stringy masses. In the aquarium, breeding is possible but raising the larvae to adulthood is challenging due to their complex life cycle and specific dietary requirements.

Symbiosis

While not known for any specific symbiotic relationships, sea hares do play a role in their ecosystem by controlling algae growth. Their grazing habits can be beneficial in a reef tank by helping to keep nuisance algae in check.

Habitat

Aplysia fasciata is typically found in shallow waters, often in rocky areas where there is an abundance of algae for them to feed on. They are adapted to the temperate waters of their native habitats and can often be seen during the day, slowly moving across the substrate or rocks.