Asteroids are mainly scavengers and carnivores. In many areas where they are found they are high level predators. Asteroids feed on slow moving prey, including gastropods, bivalves, barnacles, polychaetes and other invertebrates. They feed by grasping the prey, then everting their stomach and secreting primary enzymes on the prey. The digestive juices break down the tissue of the prey, which the asteroids then suck up.
Some asteroids are suspension feeders. Plankton and organic detritus sticks to mucus on the body surface and is moved by cilia to the mouth. A few species that use their pedicellariae to capture prey may even feed on fish.
Asteroids have a complete digestive system. The mouth leads to the cardiac stomach, which is what the sea star everts to digest its prey. The cardiac stomach leads to a pyloric stomach. Digestive glands, or pyloric ceca located in each arm. Enzymes are secreted through pyloric ducts. A short intestine follows the pyloric stomach and leads to the anus.
Foraging Behavior: filter-feeding
Primary Diet: carnivore (Piscivore , Eats non-insect arthropods, Molluscivore , Scavenger )
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