cuttlefish facts
Facts about Cuttlefish
The cuttlefish is not a fish. In fact, it is a mollusk, and is well-known for its chameleon-like behavior. Certain facts about the cuttlefish are enlisted in the Buzzle article below.
Kingdom | Animalia |
Phylum | Mollusca |
Class | Cephalopoda |
Order | Sepiida |
Superorder | Decapodiformes |
- The bone of the cuttlefish is known as the cuttlebone.
- It is made of aragonite and is unique to the cuttlefish.
- The shape, size, and pattern (ridges/texture) vary in each of the species of cuttlefish.
- It is used as a calcium supplement for birds, turtles, chinchillas, reptiles, and hermit crabs.
- It is also used as a mold in jewelry making.
- They do not have a tail; instead, they have a fin all the way round their body, which they use for movement.
- Cuttlefish use jet propulsion to escape from enemies. This feat is accomplished when water is squeezed down their mantle (body) into a siphon (tubular muscle that controls direction), and they are propelled backwards.
- On an average, the size of a cuttlefish ranges from 15 to 25 cm, i.e., 5.9 to 9.8 inches. The largest species - Sepia apama, reaches to about 50 cm, i.e., 20 inches in mantle length. The smallest are the Stumpy-spined cuttlefish, the Sepia bandensis, and are 7 cm. They are found in the Alas Strait in Indonesia.
- These cephalopodas have eight arms. Additionally, they have two tentacles that have denticulated suckers, which help them secure their prey.
- They are known as the 'chameleons of the sea', because their skin can change color rapidly.
- The color and texture change is a defense mechanism towards potential predators.
- The color-changing ability of the cuttlefish occurs due to pigmented chromatophores (red, yellow, brown, and black), which have a large membrane and sac of pigment that folds when retracted.
- Color Cells
- Yellow chromatophores (xanthophores) - closest to the surface of the skin
- Red and orange - below (erythrophores)
- Brown or black - just above the iridophore layer (melanophores)
- iridophores (plates of chitin or protein) - reflect blue and green light
- The above mentioned cells can be used in combination in every way possible.
- Cuttlefish can also sense and react to the light's polarization, which it uses to send signals to other sea creatures that can sense polarization.
- This cephalopoda, assesses its surroundings and accordingly changes its color.
- It can also camouflage itself in pitch black oceans and also in complete darkness.
- The cuttlefish does not have any blind spot as the position of the optic nerve is behind the retina.
- Even though cuttlefish are colorblind, they have sophisticated eyes. It is believed that this cephalopoda starts observing its surroundings when it is in the egg itself.
- The pupil of the cuttlefish's eye is the shape of a 'W'.
- Although colorblind, cuttlefish can perceive light polarization and react to it.
- This cephalopoda changes position of the entire lens to change focus as compared to mammals, who reshape the lens.
- Their blood is bluish green, as the protein hemocyanin contains copper instead of iron, or hemoglobin, which is found in the blood of vertebrates.
- The cuttlefish has three separate hearts: one for the body, and two branchial hearts to pumps blood to each gill.
- The flow is blood in the body of this mollusk is more rapid as compared to other animals, because hemocyanin carries less oxygen.
- The original sepia ink used by artists was extracted from the cuttlefish, though nowadays, it is replaced by a synthetic ink.
- The ink is shot out of the fish as a defense mechanism to confuse predators and to make a quick escape.
- All cuttlefish have neurotoxins in their saliva that are produced by bacteria, but not all cuttlefish are poisonous.
- The toxins found on the Metasepia pfefferi, which is also known as the flamboyant cuttlefish are seen to be as lethal as the toxins found in the blue-ringed octopus.
- The only known species of the cuttlefish that is known to have poisonous flesh is the flamboyant cuttlefish.
- This mollusk likes to feed on small shrimp that have just hatched, crabs, and other fish.
- They use their camouflaging abilities to hunt down their prey.
- They shoot jets of water to uncover their prey from the sand and grab them with their tentacles when they are trying to escape.
- Their prey is then paralyzed by their poison and eventually eaten.
- Cuttlefish prefer shallow tropical waters.
- They are mostly found in the Mediterranean Sea, Baltic Sea, shallow waters of South Africa, Australia, Malaysia, the Philippines, and the English Channel.
- During the mating season, male cuttlefish challenge each other for dominance.
- Direct contact is usually not made between two males during their 'battle' for dominance, they just threaten each other till one of them backs down and swims away.
- Sometimes though, when a large cuttlefish is threatened by another male, then the cuttlefish does attack and tries to make the other one flee.
- Cuttlefish can get very aggressive, as there are roughly four or five cuttlefish ambling for the same female.
- These fish grow very fast, hence the possibility of them finding a mate when they are bigger is always high as compared to them finding a mate when they are smaller in size.
- Another interesting trait displayed by this animal during its mating ritual is: if the cuttlefish is a smaller one, it disguises itself as a female by changing its colors and hiding its extra arms or even pretending to hold an egg sac.
- Due to their size and disguise, they can easily swim past a male guarding the female and mate with her.
- The male fish inserts sperm sacs into an opening near the females mouth by using a specialized tentacle.
- A few hours later, once the eggs are laid, the male guards the female and the eggs.