Sea stars, like sea urchins and sand dollars, do not have backbones, which makes them part of a group called invertebrates. Most starfish, also known as sea stars, eat by prying open the shells of prey such as clams or oysters with their arms, pushing their stomachs out their mouths and into the prey's shell, partially digesting the animal and then pulling their stomachs back into their mouths. Sea stars prefer tanks with plenty of hiding places and substrates to explore. What do sea stars eat, and what its a sea star. Since blue sea star eyes don't have lenses, the images they form are fairly rough.  Linckia multifora produces 'comets', or separated arms, from the mother individual; these offspring proceed to grow four tiny stubs of arms ready for growth to maturity. Many different animals eat sea stars, including fish, sea turtles, snails, crabs, shrimp, otters, birds and even other sea stars. The Starfish – or Sea Star – may be one of the most beautiful creatures in the ocean. A few species, such as the spiny star of the North Atlantic, eat other sea stars! As such, the Sand Sifting Sea Star should be actively fed a varied diet consisting of natural food sources, especially in well-established marine aquariums. They will also eat small fish, sea snails and barnacles. Blue glaucuses eat large, venomous prey, such as the Portuguese man o’ war and the blue button jelly, and store their prey’s stinging cells in their bodies to later use against predators. Sea Star Care.
Despite their apparent gentle nature, these small molluscs are known to be one of the most venomous and dangerous sea creatures on the planet. It has a nerve ring around the mouth and a radial nerve running along the ambulacral region. Fish have backbones, which makes them vertebrates. What Do Sea Stars Eat? Yes. All live in the ocean, on the sea floor.Many starfish live in deep water, others in shallow water.  The Blue Linckia is also prone to parasitization by a species of the parasitic gastropod Thyca crystallina.