Common name: Variable Thorny Oyster

General information

The Variable Thorny Oyster, Spondylus varius, is a species of bivalve mollusc known for its vibrant and variable coloration and spiny shell. It is a sought-after species for marine aquariums due to its unique appearance and the touch of natural diversity it can add to a reef tank.

Care

Caring for Spondylus varius requires a well-established aquarium with stable water conditions. They should be placed on a rocky substrate where they can attach themselves. Moderate to strong water flow and good water quality are essential for their health. They are filter feeders, so supplemental feeding with phytoplankton or similar food designed for bivalves is beneficial.

Reproduction

Thorny Oysters are hermaphrodites, possessing both male and female reproductive organs. They can reproduce by releasing sperm and eggs into the water column, where fertilization occurs. In the aquarium, breeding is rare, but with optimal conditions, it is possible to observe spawning behavior.

Symbiosis

Spondylus varius often hosts a variety of commensal organisms, including small crabs, shrimps, and even some fish that seek refuge among its spines. This relationship adds to the biodiversity of the reef tank and provides a dynamic and interactive environment.

Habitat

Variable Thorny Oysters are found in the Indo-Pacific region, typically in coral reefs and rocky substrates. They prefer depths where light is sufficient for the growth of the microalgae they feed on, but they can be found at various depths depending on the location.