Starfish Biscuits (Tosia Australis)
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Description
Starfish Biscuits (Tosia Australis)
Biscuit Sea Star is a striking bright orange-red sea star named for its rounded shape and size, which resembles a large biscuit.
Identification
The upper surface of the Biscuit Sea Star is made up of tightly interlocking plates, with six to eight larger plates lining the edges of its short arms. Its vivid orange-red coloration makes it easily recognizable among intertidal marine species.
Habitat
This species inhabits rocky intertidal shorelines and shallow coastal waters, typically occurring at depths of up to 40 metres.
Feeding and Diet
Biscuit Sea Stars mainly consume sea squirts, sponges, bryozoans, and algae. In aquarium environments, they are highly sensitive to sudden fluctuations in oxygen concentration, salinity, and water pH, and they are particularly intolerant of copper-based medications. Because of this sensitivity, gradual drip acclimation is strongly advised when introducing them to new systems. They should also never be exposed to air during handling.
To maintain their health in captivity, their diet can be supplemented with small portions of shrimp, mussels, or flake food.
Distribution
The Biscuit Sea Star occurs across southern Australian waters, including regions around Sydney, Victoria, South Australia, Western Australia, and Tasmania.
