They may also feed on other cuttlefish. They have a beak in the middle of their arms that they can use to break the shells of their food. Cuttlefish, any of several marine cephalopods of the order Sepioidea, related to the octopus and squid and characterized by a thick internal calcified shell called the cuttlebone.The approximately 100 species of cuttlefish range between 2.5 and 90 cm (1 to 35 inches) and have somewhat flattened bodies bordered by a pair of narrow fins. Uses . Many people would like to keep cuttlefish as pets. The cuttlefish’s flat body allows it to live and hover near the ocean bottom where it finds its favorite food. Both squid and cuttlefish have remnants of their ancient external shells, but these hard structures look quite different. Squid have a flexible, feather-shaped structure inside their bodies called the pen, where cuttlefish have a broader internal shell called the cuttlebone. Cuttlefish Are Predators . The average life expectancy of a cuttlefish is about 1–2 years. Do not put other fish in with your cuttlefish, because they will become a midnight snack. 07. of 11. Cuttlefish are sexually mature at 14 to 18 months of age and only live 1 to 2 years. Here at the Aquarium, juveniles will only eat live mysids and adults will only eat live grass shrimp. Studies are said to indicate cuttlefish to … Because the flamboyant cuttlefish will only eat live prey, it’s a difficult (and expensive) animal to raise and exhibit. The Spruce The Spruce Eats The Spruce Crafts. Cuttlefish keep their arms out of the reach of crab's claws! Cuttlefish eat small molluscs, crabs, shrimp, fish, octopus, worms, and other cuttlefish. This is quite easy in the UK and Europe as species of cuttlefish like Sepia officinalis the 'European cuttlefish' are found there. Cuttlefish are active predators who feed on other mollusks, fish, and crabs. Their predators include dolphins, sharks, fish, seals, seabirds, and other cuttlefish. The cuttlefish is actually a mollusk, related to the octopus, squid, and nautilus, and a cuttlebone is an internal shell with gas-filled chambers that keep the cuttlefish buoyant and able to maneuver in the water. Cuttlefish have eight arms and two tentacles, like squid, but differ from other cephalopods by the presence of an internal skeletal/buoyancy structure, the cuttle bone, actually an internal chalky shell, which is often found washed up on beaches (and fed to budgies). Cuttlefish like live food, preferably crabs, shrimp, or small fish, which can become very expensive, and it is hard to train them to eat 'dead' food, since they enjoy hunting for their prey. Sepia apama, also known as the giant cuttlefish and Australian giant cuttlefish, is the world's largest cuttlefish species, growing to 50 cm (20 in) in mantle length and over 10.5 kg (23 lb) in weight. 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