Common name: Aru Sponge

General information

The Aru Sponge, scientifically known as Axinella aruensis, is a species of sponge found in the marine waters of the Indo-Pacific region. This sponge is notable for its striking appearance, often displaying a vibrant yellow to orange coloration that can add a splash of color to any reef aquarium. Sponges like Axinella aruensis are filter feeders, playing a crucial role in the ecosystem by cleaning the water of bacteria and particulate organic matter.

Care

Caring for Axinella aruensis requires a well-established aquarium with stable water conditions. They thrive in moderate to strong water flow which facilitates their filter-feeding behavior. It is important to ensure that they are not placed in direct, strong light as this can inhibit their growth and potentially lead to bleaching. Sponges should never be exposed to air, as trapped air bubbles can cause tissue necrosis.

Reproduction

Sponges like Axinella aruensis reproduce both sexually and asexually. In the aquarium, asexual reproduction is more common, where a piece of the sponge breaks off and attaches to a substrate to form a new individual. Sexual reproduction involves the release of sperm into the water column, which then fertilizes eggs in other sponges leading to the development of free-swimming larvae.

Symbiosis

While Axinella aruensis does not have the same type of symbiotic relationships as corals or anemones, it does provide microhabitats for a variety of small marine organisms. These organisms can include tiny crustaceans and other invertebrates that seek refuge within the sponge's structure.

Habitat

The natural habitat of Axinella aruensis is typically on reef slopes and walls, where they can be found at various depths. They are often seen in areas with clear water and healthy coral cover, which provides the necessary water flow and food availability for these sponges.