rapid growth 6 months Feeding on tiny prey to match their size, the young cuttles hunt voraciously and grow very quickly. young adulthood 12–18 months As they mature, cuttlefish get stronger. Their diet changes to hunting fish and other cephalopods as their energy requirements increase.
mating season 13–20 months Cuttlefish make their way to shallower water to mate. It’s one of the only times that large numbers of these critters get together. egg fertilisation 14–20 months Males put on elaborate displays to attract mates. They then pass a pocket of sperm to the female, who fertilises her eggs as she lays them. end of life Up to 2 years Male cuttlefish die shortly after mating, while females will wait for their eggs to hatch before they perish.
“The blood that the hearts pump is a blue-green colour thanks to haemocyanin, which contains copper”
DigestiveglandMantleGillStomachHeartFinAccessory heart Brain The cuttlefish brain is arrangedin a donut shape, which surrounds the oesophagus. It has one of the largest brainto-body size ratios ofany invertebrate. Skin Capable of flashing incredible colours when threatened, the chromatophores on the flamboyant cuttlefish’sskin illuminate as a response to predators. Cuttlebone Providing buoyancy and stability, the light, porous bone that runs throughout the cuttlefish’s body is made mainly of calcium carbonate.Ink sacFound near the cuttlefish’s siphon,the ink sac also contains the ink glandwhere the fluid is produced. When full, the sac is ready to be expelled to deter any approachingpredators.Circulatory systemCuttlefish have three hearts – one for each gill and one for the rest of the body. The blood that the hearts pump is a blue-green colour thanks to haemocyanin,which contains copper.