Cuttlefish

Cuttlefish or cuttles[3] are marine molluscs of the order Sepiida. They belong to the class Cephalopoda, which also includes squid, octopuses, and nautiluses. Cuttlefish have a unique internal shell, the cuttlebone.

Cuttlefish have large, W-shaped pupils, eight arms, and two tentacles furnished with denticulated suckers, with which they secure their prey. They generally range in size from 15 to 25 cm (6 to 10 in), with the largest species, Sepia apama, reaching 50 cm (20 in) in mantle length and over 10.5 kg (23 lb) in mass.[4]

Cuttlefish eat small molluscs, crabs, shrimp, fish, octopus, worms, and other cuttlefish. Their predators include dolphins, sharks, fish, seals, seabirds, and other cuttlefish. The average life expectancy of a cuttlefish is about 1–2 years. Recent studies indicate cuttlefish are among the most intelligent invertebrates.[5] Cuttlefish also have one of the largest brain-to-body size ratios of all invertebrates.[5]

The "cuttle" in cuttlefish comes from the Old English name for the species, cudele, which may be cognate with the Old Norse koddi (cushion) and the Middle Low German Kudel (rag).[6] The Greco-Roman world valued the cuttlefish as a source of the unique brown pigment the creature releases from its siphon when it is alarmed. The word for it in both Greek and Latin, sepia, now refers to the reddish-brown color sepia in English.

Cuttlefish
Temporal range: Miocene – Recent[1]
Cuttlefish komodo large
The giant cuttlefish (Sepia apama), above, is the largest species
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Superorder: Decapodiformes
Order: Sepiida
Zittel, 1895
Suborders and Families
Synonyms
  • Sepiolida Fioroni, 1981[2]

Fossil record

The earliest sepia-like fossils of cuttlefish are from the Cretaceous period.[7][8] Whether the earlier Trachyteuthis is assigned to this class, or to the Octopodiformes, remains unclear.[9]

Range and habitat

Sepia mestus (front view)
S. mestus swimming (Australia)

The family Sepiidae, which contains all cuttlefish, inhabits tropical and temperate ocean waters. They are mostly shallow-water animals, although they are known to go to depths of about 600 m (2,000 ft).[10] They have an unusual biogeographic pattern: they are present along the coasts of East and South Asia, Western Europe, and the Mediterranean, as well as all coasts of Africa and Australia, but are totally absent from the Americas. By the time the family evolved, ostensibly in the Old World, the North Atlantic possibly had become too cold and deep for these warm-water species to cross.[11] The common cuttlefish (Sepia officinalis), is found in the Mediterranean, North, and Baltic Seas, although populations may occur as far south as South Africa. They are found in sublittoral depths, between the low tide line and the edge of the continental shelf, to about 180 m (100 fathoms)."[12] The cuttlefish is listed under the Red List category of "least concern" by the IUCN Red List of Threatened Species. This means that while some over-exploitation of the marine animal has occurred in some regions due to large-scale commercial fishing, their wide geographic range prevents them from being too threatened. Ocean acidification, however, caused largely by higher levels of carbon dioxide emitted into the atmosphere, is cited as a potential threat.[13]

Anatomy and physiology

Visual system

Cuttlefish eye
The characteristic W-shape of the cuttlefish eye
Pupil expansion in Sepia officinalis

Cuttlefish, like other cephalopods, have sophisticated eyes. The organogenesis and the final structure of the cephalopod eye fundamentally differ from those of vertebrates such as humans.[14] Superficial similarities between cephalopod and vertebrate eyes are thought to be examples of convergent evolution. The cuttlefish pupil is a smoothly curving W-shape.[15][16] Although cuttlefish cannot see color,[17] they can perceive the polarization of light, which enhances their perception of contrast. They have two spots of concentrated sensor cells on their retinas (known as foveae), one to look more forward, and one to look more backward. The eye changes focus by shifting the position of the entire lens with respect to the retina, instead of reshaping the lens as in mammals. Unlike the vertebrate eye, no blind spot exists, because the optic nerve is positioned below the retina. This allows cuttlefish to see in front of them and behind them at the same time.

The cuttlefish's eyes are thought to be fully developed before birth, and they start observing their surroundings while still in the egg. In consequence, they may prefer to hunt the prey they saw before hatching.[18]

Circulatory system

The blood of a cuttlefish is an unusual shade of green-blue, because it uses the copper-containing protein haemocyanin to carry oxygen instead of the red, iron-containing protein haemoglobin found in vertebrates' blood. The blood is pumped by three separate hearts: two branchial hearts pump blood to the cuttlefish's pair of gills (one heart for each), and the third pumps blood around the rest of the body. Cuttlefish blood must flow more rapidly than that of most other animals because haemocyanin carries substantially less oxygen than haemoglobin. Unlike most other mollusks, cephalopods like cuttlefish have a closed circulatory system.

Cuttlebone

Top and bottom view of a cuttlebone, the buoyancy organ and internal shell of a cuttlefish

Cuttlefish-Cuttlebone2
Cuttlefish-Cuttlebone1

Cuttlefish possess an internal structure called the cuttlebone, which is porous and is made of aragonite. The pores provide it with buoyancy, which the cuttlefish regulates by changing the gas-to-liquid ratio in the chambered cuttlebone via the ventral siphuncle.[19] Each species' cuttlebone has a distinct shape, size, and pattern of ridges or texture. The cuttlebone is unique to cuttlefish, and is one of the features that distinguish them from their squid relatives.[20]

Specialized components

Ink

Like other marine mollusks, cuttlefish have ink stores that are used for chemical deterrence, phagomimicry, sensory distraction, and evasion when attacked.[21] The composition of the ink leads to a richly colored "black" ink which is rich in ammonium salts and amino acids that may have a role in phagomimicry defenses.[21]

The use of this color is wide-ranged. A common use is in cooking with squid ink to darken and flavor rice and pasta. It is purported to add a sweet flavor to the food, and leaves the food stained a dark black color. In addition to food, cuttlefish ink can be used with plastics and staining of materials. The diverse composition of cuttlefish ink, and its deep complexity of colors, allows for dilution and modification of its color. Cuttlefish ink can be used to make noniridescent reds, blues, and greens, [22] subsequently used for biomimetic colors and materials.

Suckers and venom

The suckers of cuttlefish extend most of the length of their arms and along the distal portion of their tentacles. Like other cephalopods, cuttlefish have "taste-by-touch" sensitivity in their suckers, allowing them to discriminate among objects and water currents that they contact.[23]

Some cuttlefish are venomous. The genes for venom production are thought to be descended from a common ancestor.[24] The muscles of the flamboyant cuttlefish (Metasepia pfefferi) contain a highly toxic, unidentified compound[5] as lethal as that of a fellow cephalopod, the blue-ringed octopus.[25]

Reproduction

Male cuttlefish challenge one another for dominance and the best den during mating season. During this challenge, no direct contact is usually made. The animals threaten each other until one of them backs down and swims away. Eventually, the larger male cuttlefish mate with the females by grabbing them with their tentacles, turning the female so that the two animals are face-to-face, then using a specialized tentacle to insert sperm sacs into an opening near the female's mouth. The male then guards the female until she lays the eggs a few hours later.[26]

On occasion, a large competitor arrives to threaten the male cuttlefish. In these instances, the male first attempts to intimidate the other male. If the competitor does not flee, the male eventually attacks it to force it away. The cuttlefish that can paralyze the other first, by forcing near its mouth, wins the fight and the female. Since typically four or five (and sometimes as many as 10) males are available for every female, this behavior is inevitable.[27]

Cuttlefish are indeterminate growers, so smaller cuttlefish always have a chance at finding a mate the next year when they are bigger.[28] Additionally, cuttlefish unable to win in a direct confrontation with a guard male have been observed employing several other tactics to acquire a mate. The most successful of these methods is camouflage; smaller cuttlefish use their camouflage abilities to disguise themselves as a female cuttlefish. Changing their body color, and even pretending to be holding an egg sack, disguised males are able to swim past the larger guard male and mate with the female.[27][29][30]

Communication

Cephalopods are able to communicate visually using a diverse range of signals. To produce these signals, cephalopods can vary four types of communication element: chromatic (skin coloration), skin texture (e.g. rough or smooth), posture, and locomotion. Changes in body appearance such as these are sometimes called polyphenism. The common cuttlefish can display 34 chromatic, six textural, eight postural and six locomotor elements, whereas flamboyant cuttlefish use between 42 and 75 chromatic, 14 postural, and seven textural and locomotor elements. For the Caribbean reef squid (Sepioteuthis sepioidea), they are thought to have up to 35 distinct signalling states.[31][32]

Visual signals of the common cuttlefish[31]
Chromic - light Chromic - dark Texture Posture Locomotor
White posterior triangle Anterior transverse mantle line Smooth skin Raised arms Sitting
White square Posterior transverse mantle line Coarse skin Waving arms Bottom suction
White mantle bar Anterior mantle bar Papillate skin Splayed arms Buried
White lateral stripe Posterior mantle bar Wrinkled first arms Drooping arms Hovering
White fin spots Paired mantle spots White square papillae Extended fourth arm Jetting
White fin line Median mantle stripe Major lateral papillae Flattened body Inking
White neck spots Mantle margin stripe Raised head
Iridescent ventral mantle Mantle margin scalloping Flanged fin
White zebra bands Dark fin line
White landmark spots Black zebra bands
White splotches Mottle
White major lateral papillae Lateroventral patches
White head bar Anterior head bar
White arm triangle Posterior head bar
Pink iridophore arm stripes Pupil
White arms spots (males only) Eye ring
Dark arm stripes
Dark arms

Chromatic

Cuttlefish color
This broadclub cuttlefish (Sepia latimanus) can change from camouflage tans and browns (top) to yellow with dark highlights (bottom) in less than one second.

Cuttlefish are sometimes referred to as the "chameleons of the sea" because of their ability to rapidly alter their skin color – this can occur within one second. Cuttlefish change color and pattern (including the polarization of the reflected light waves), and the shape of the skin to communicate to other cuttlefish, to camouflage themselves, and as a deimatic display to warn off potential predators. Under some circumstances, cuttlefish can be trained to change color in response to stimuli, thereby indicating their color changing is not completely innate.[33]

Cuttlefish can also affect the light's polarization, which can be used to signal to other marine animals, many of which can also sense polarization, as well as being able to influence the color of light as it reflects off their skin.[34] Although cuttlefish (and most other cephalopods) lack color vision, high-resolution polarisation vision may provide an alternative mode of receiving contrast information that is just as defined.[35] The cuttlefish's wide pupil attenuates chromatic aberration, allowing it to perceive color by focusing specific wavelengths onto the retina.[36]

The three broad categories of color patterns are uniform, mottle, and disruptive.[37] Cuttlefish can display as many as 12 to 14 patterns,[31] 13 of which have been categorized as seven "acute" (relatively brief) and six "chronic" (long-lasting) patterns.[38] although other researchers suggest the patterns occur on a continuum.[37]

Patterns of the common cuttlefish[31]
Chronic Acute
Uniform light Uniform blanching
Stipple Uniform darkening
Light mottle Acute disruptive
Disruptive Deimatic
Dark mottle Flamboyant
Weak zebra Intense zebra
Passing cloud

The color-changing ability of cuttlefish is due to multiple types of cells. These are arranged (from the skin's surface going deeper) as pigmented chromatophores above a layer of reflective iridophores and below them, leucophores.[39][40]

Chromatophores

The chromatophores are sacs containing hundreds of thousands of pigment granules and a large membrane that is folded when retracted. Hundreds of muscles radiate from the chromatophore. These are under neural control and when they expand, they reveal the hue of the pigment contained in the sac. Cuttlefish have three types of chromatophore: yellow/orange (the uppermost layer), red, and brown/black (the deepest layer). The cuttlefish can control the contraction and relaxation of the muscles around individual chromatophores, thereby opening or closing the elastic sacs and allowing different levels of pigment to be exposed.[32] Furthermore, the chromatophores contain luminescent protein nanostructures in which tethered pigment granules modify light through absorbance, reflection, and fluorescence between 650 and 720 nm.[41][42]

For cephalopods in general, the hues of the pigment granules are relatively constant within a species, but can vary slightly between species. For example, the common cuttlefish and the opalescent inshore squid (Loligo opalescens) have yellow, red, and brown, the European common squid (Alloteuthis subulata) has yellow and red, and the common octopus has yellow, orange, red, brown, and black.[32]

In cuttlefish, activation of a chromatophore can expand its surface area by 500%. Up to 200 chromatophores per mm2 of skin may occur. In Loligo plei, an expanded chromatophore may be up to 1.5 mm in diameter, but when retracted, it can measure as little as 0.1 mm.[41][43][44]

Iridophores

Retracting the chromatophores reveals the iridophores and leucophores beneath them, thereby allowing cuttlefish to use another modality of visual signalling brought about by structural coloration.

Iridophores are structures that produce iridescent colors with a metallic sheen. They reflect light using plates of crystalline chemochromes made from guanine. When illuminated, they reflect iridescent colors because of the diffraction of light within the stacked plates. Orientation of the schemochrome determines the nature of the color observed. By using biochromes as colored filters, iridophores create an optical effect known as Tyndall or Rayleigh scattering, producing bright blue or blue-green colors. Iridophores vary in size, but are generally smaller than 1 mm. Squid at least are able to change their iridescence. This takes several seconds or minutes, and the mechanism is not understood.[45] However, iridescence can also be altered by expanding and retracting the chromatophores above the iridophores. Because chromatophores are under direct neural control from the brain, this effect can be immediate.

Cephalopod iridophores polarize light. Cephalopods have a rhabdomeric visual system which means they are visually sensitive to polarized light. Cuttlefish use their polarization vision when hunting for silvery fish (their scales polarize light). Female cuttlefish exhibit a greater number of polarized light displays than males and also alter their behavior when responding to polarized patterns. The use of polarized reflective patterns has led some to suggest that cephalopods may communicate intraspecifically in a mode that is "hidden" or "private" because many of their predators are insensitive to polarized light.[45][46][44]

Leucophores

Kalamar
The white spots and bands on this cuttlefish are produced by leucophores.

Leucophores, usually located deeper in the skin than iridophores, are also structural reflectors using crystalline purines, often guanine, to reflect light. Unlike iridophores, however, leucophores have more organized crystals that reduce diffraction. Given a source of white light, they produce a white shine, in red they produce red, and in blue they produce blue. Leucophores assist in camouflage by providing light areas during background matching (e.g. by resembling light-colored objects in the environment) and disruptive coloration (by making the body appear to be composed of high-contrasting patches).[45]

The reflectance spectra of cuttlefish patterns and several natural substrates (stipple, mottle, disruptive) can be measured using an optic spectrometer.[45]

Intraspecific communication

Cuttlefish sometimes use their color patterns to signal future intent to other cuttlefish. For example, during agonistic encounters, male cuttlefish adopt a pattern called the intense zebra pattern, considered to be an honest signal. If a male is intending to attack, it adopts a "dark face" change, otherwise, it remains pale.[47]

In at least one species, female cuttlefish react to their own reflection in a mirror and to other females by displaying a body pattern called "splotch". However, they do not use this display in response to males, inanimate objects, or prey. This indicates they are able to discriminate same-sex conspecifics, even when human observers are unable to discern the sex of a cuttlefish in the absence of sexual dimorphism.[48]

Female cuttlefish signal their receptivity to mating using a display called precopulatory grey.[48] Male cuttlefish sometimes use deception toward guarding males to mate with females. Small males hide their sexually dimorphic fourth arms, change their skin pattern to the mottled appearance of females, and change the shape of their arms to mimic those of nonreceptive, egg-laying females.[30]

Displays on one side of a cuttlefish can be independent of the other side of the body; males can display courtship signals to females on one side while simultaneously showing female-like displays with the other side to stop rival males interfering with their courtship.[49]

Interspecific communication

The deimatic display (a rapid change to black and white with dark ‘eyespots’ and contour, and spreading of the body and fins) is used to startle small fish that are unlikely to prey on the cuttlefish, but use the flamboyant display towards larger, more dangerous fish,[50] and give no display at all to chemosensory predators such as crabs and dogfish.[51]

One dynamic pattern shown by cuttlefish is dark mottled waves apparently repeatedly moving down the body of the animals. This has been called the passing cloud pattern. In the common cuttlefish, this is primarily observed during hunting, and is thought to communicate to potential prey – “stop and watch me”[32] – which some have interpreted as a type of "hypnosis".

Camouflage

Camouflage edit
Juvenile cuttlefish camouflaged against the seafloor
External video
Kings of CamouflageNova documentary

Cuttlefish are able to rapidly change the color of their skin to match their surroundings and create chromatically complex patterns,[51] despite their inability to perceive color, through some mechanism which is not completely understood.[52] They have been seen to have the ability to assess their surroundings and match the color, contrast and texture of the substrate even in nearly total darkness.[43]

The color variations in the mimicked substrate and animal skin are similar. Depending on the species, the skin of cuttlefish responds to substrate changes in distinctive ways. By changing naturalistic backgrounds, the camouflage responses of different species can be measured.[53] Sepia officinalis changes color to match the substrate by disruptive patterning (contrast to break up the outline), whereas S. pharaonis matches the substrate by blending in. Although camouflage is achieved in different ways, and in an absence of color vision, both species change their skin colors to match the substrate. Cuttlefish adapt their own camouflage pattern in ways that are specific for a particular habitat. An animal could settle in the sand and appear one way, with another animal a few feet away in a slightly different microhabitat, settled in algae for example, will be camouflaged quite differently.[43]

Cuttlefish are also able to change the texture of their skin. The skin contains bands of circular muscle which as they contract, push fluid up. These can be seen as little spikes, bumps, or flat blades. This can help with camouflage when the cuttlefish becomes texturally as well as chromatically similar to objects in its environment such as kelp or rocks.[43]

Diet

Video of S. mestus in Sydney waters, hunting and catching prey

While the preferred diet of cuttlefish is crabs and fish, they feed on small shrimp shortly after hatching.[54]

Cuttlefish use their camouflage to hunt and sneak up on their prey.[55] They swim at the bottom, where shrimp and crabs are found, and shoot out a jet of water to uncover the prey buried in the sand. Then when the prey tries to escape, the cuttlefish open their eight arms and shoot out two long feeding tentacles to grab them. Each arm has a pad covered in suckers, which grabs and pulls prey toward its beak, paralyzing it with venom before eating it.[54] To achieve a hypnotic effect and stun prey before catching it, cuttlefish are also known to change color rapidly.

Taxonomy

Sepia officinalis1
Illustration of Sepia officinalis
Video of a cuttlefish in its natural habitat

Over 120 species of cuttlefish are currently recognised, grouped into six families.

Sepia officinalis (aquarium)

The common cuttlefish (Sepia officinalis) is the best-known cuttlefish species

Hooded Cuttlefish

Hooded cuttlefish (Sepia prashadi)

Seba molluscas

Engravings by the Dutch zoologist Albertus Seba, 1665–1736

Human uses

As food

Linguine with cuttlefish
Linguine with cuttlefish and ink sauce served at a Venetian osteria

Cuttlefish are caught for food in the Mediterranean, East Asia, the English Channel, and elsewhere.

In East Asia, dried, shredded cuttlefish is a popular snack food. In the Qing Dynasty manual of Chinese gastronomy, the Suiyuan shidan, the roe of the cuttlefish is considered a difficult-to-prepare, but sought-after delicacy.[56]

Cuttlefish are quite popular in Europe. For example, in northeast Italy, they are used in risotto al nero di seppia (risotto with cuttlefish ink), also found in Croatia and Montenegro as crni rižot (black risotto). Catalan cuisine, especially that of the coastal regions, uses cuttlefish and squid ink in a variety of tapas and dishes such as arròs negre. Breaded and deep-fried cuttlefish is a popular dish in Andalusia. In Portugal, cuttlefish is present in many popular dishes. Chocos com tinta (cuttlefish in black ink), for example, is grilled cuttlefish in a sauce of its own ink. Cuttlefish is also popular in the region of Setúbal, where it is served as deep-fried strips or in a variant of feijoada, with white beans. Black pasta is often made using cuttlefish ink.

Sepia

Cuttlefish ink was formerly an important dye, called sepia. Today, artificial dyes have mostly replaced natural sepia.

Metal casting

Cuttlebone has been used since antiquity to make casts for metal. A model is pushed into the cuttlebone and removed, leaving an impression. Molten gold, silver or pewter can then be poured into the cast.[57][58]

Smart clothing

Research into replicating biological color-changing has led to engineering artificial chromatophores out of small devices known as dielectric elastomer actuators. Engineers at the University of Bristol have engineered soft materials that mimic the color-changing skin of animals like cuttlefish,[59] paving the way for "smart clothing" and camouflage applications.[60]

Pets

Though cuttlefish are rarely kept as pets, due in part to their fairly short lifetimes, the most common to be kept are Sepia officinalis or Sepia bandensis.[61]

Cuttlebone is given to parakeets and other cagebirds as a source of dietary calcium.[20]

See also

References

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External links

Arròs negre

Arròs negre (Valencian pronunciation: [aˈrɔz ˈneɣɾe], Spanish: arroz negro) is a Valencian and Catalan dish made with cuttlefish (or squid) and rice, somewhat similar to seafood paella. Some call it paella negra ("black paella"), however it is traditionally not called a paella even though it is prepared in a similar manner.

Arròs negre should not be confused with black rice, the collective name for several cultivars of heirloom rice that have a naturally dark color.

The traditional recipe for this dish calls for squid ink, cuttlefish or squid, white rice, garlic, green cubanelle peppers, sweet paprika, olive oil and seafood broth. However, many cooks add other seafood as well, such as crab and shrimp.

The dish's dark color comes from squid ink which also enhances its seafood flavor.

In addition to Valencia and Catalonia, this dish is popular in Cuba and Puerto Rico where on both islands it is known as arroz con calamares ("rice with squid" in Spanish). In the Philippines, it is considered to be a subtype of the Filipino adaptation of paelya, and is known as paella negra (or paelya negra).Fideuà negra ("black noodles" in Catalan) is a variation made with noodles instead of rice and is usually served with aioli.

Bobtail squid

Bobtail squid (order Sepiolida) are a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally quite small (typical male mantle length being between 1 and 8 cm).Sepiolids live in shallow coastal waters of the Pacific Ocean and some parts of the Indian Ocean and Atlantic Ocean as well as in shallow waters on the west coast of the Cape Peninsula off South Africa.

Like cuttlefish, they can swim by either using the fins on their mantle or by jet propulsion. They are also known as dumpling squid (owing to their rounded mantle) or stubby squid.

Cephalopod ink

Cephalopod ink is a dark-coloured ink released into water by most species of cephalopod, usually as an escape mechanism. All cephalopods, with the exception of the Nautilidae and the Cirrina (deep-sea octopuses), are able to release ink.

The ink is released from the ink sacs (located between the gills) and is dispersed more widely when its release is accompanied by a jet of water from the siphon. Its dark colour is caused by its main constituent, melanin. Each species of cephalopod produces slightly differently coloured inks; generally, octopuses produce black ink, squid ink is blue-black, and cuttlefish ink is a shade of brown.

A number of other aquatic molluscs have similar responses to attack, including the gastropod clade known as sea hares.

Cephalopods in popular culture

Cephalopods, specifically pertaining to octopuses, squids, and cuttlefishes, are most commonly represented in popular culture in the Western world as creatures that spray ink and latch onto things with their tentacles without releasing.

The octopus has been used as a (usually negative) metaphor for entity which is perceived as sending out many "tentacles" from one "center" in order to exert power and control.

Coleoidea

Subclass Coleoidea, or Dibranchiata, is the grouping of cephalopods containing all the various taxa popularly thought of as "soft-bodied" or "shell-less," i.e., octopus, squid and cuttlefish. Unlike its extant sister group Nautiloidea, whose members have a rigid outer shell for protection, the coleoids have at most an internal cuttlebone, gladius, or shell that is used for buoyancy or support. Some species have lost their cuttlebone altogether, while in some it has been replaced by a chitinous support structure.

The major divisions of Coleoidea are based upon the number of arms or tentacles and their structure. The extinct and most primitive form, the Belemnoidea, presumably had ten equally sized arms, in five pairs numbered dorsal to ventral as I, II, III, IV and V. More modern species either modified or lost a pair of arms. The superorder Decapodiformes has arm pair IV modified into long tentacles with suckers generally only on the club-shaped distal end. Superorder Octopodiformes has modifications to arm pair II; it is significantly reduced and used only as a sensory filament in the Vampyromorphida, while Octopoda species have totally lost that arm pair.

Common cuttlefish

The common cuttlefish or European common cuttlefish (Sepia officinalis) is one of the largest and best-known cuttlefish species. They are a migratory species that spend the summer and spring inshore for spawning and then move to depths of 100 to 200m during autumn and winter. They grow to 49 cm in mantle length (ML) and 4 kg in weight. Animals from subtropical seas are smaller and rarely exceed 30 cm in ML.The common cuttlefish is native to at least the Mediterranean Sea, North Sea, and Baltic Sea, although subspecies have been proposed as far south as South Africa. It lives on sand and mud seabeds and can tolerate brackish water conditions.

Cuttlebone

Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly known as cuttlefish, a family within the cephalopods.

Cuttlebone is composed primarily of aragonite. It is a chambered, gas-filled shell used for buoyancy control; its siphuncle is highly modified and is on the ventral side of the shell. The microscopic structure of cuttlebone consists of narrow layers connected by numerous upright pillars.

Depending on the species, cuttlebones implode at a depth of 200 to 600 metres (660 to 1,970 ft). Because of this limitation, most species of cuttlefish live on the seafloor in shallow water, usually on the continental shelf.The largest cuttlebone belongs to Sepia apama, the giant Australian cuttlefish, which lives between the surface and a maximum depth of 100 metres.

Cuttlefish Bay, South Australia

Cuttlefish Bay is a locality in the Australian state of South Australia located on the north coast of Dudley Peninsula on Kangaroo Island overlooking Backstairs Passage about 106 kilometres (66 miles) south of the state capital of Adelaide and about 8 kilometres (5.0 miles) east of Penneshaw. Its boundaries were created in March 2002 while its name was derived from Cuttlefish Bay, a bay located on its coastline with Backstairs Passage. Land use within the locality is concerned with agriculture while land adjoining the coastline has additional statutory constraints to “conserve the natural features of the coast.” Cuttlefish Bay is located within the federal division of Mayo, the state electoral district of Mawson and the local government area of the Kangaroo Island Council.

Dave Brockie

David Murray Brockie (August 30, 1963 – March 23, 2014) was a Canadian musician, and best known as the lead vocalist of the heavy metal band Gwar, in which he performed as Oderus Urungus. He performed as a bassist and lead singer in bands such as Death Piggy, X-Cops, and the Dave Brockie Experience (DBX), and starred in the comedy/horror TV sitcom Holliston as Oderus Urungus. Brockie died in 2014 of a heroin overdose.

Dried shredded squid

Dried shredded squid is a dried, shredded, seasoned, seafood product, made from squid or cuttlefish, commonly found in coastal Asian countries, Russia, and Hawaii. The snack is also referred to as dried shredded cuttlefish.

Neocoleoidea

Neocoleoidea is a large group of marine cephalopods. This cohort contains two extant groups: Decapodiformes (squid, cuttlefish, and relatives) and Octopodiformes (octopuses and the vampire squid). Species within this group exist in all major habitats in the ocean, in both the southern and northern polar regions, and from intertidal zones to great depths. Whilst conventionally held to be monophyletic, the only morphological character for the group is the presence of suckers: although the presence of these features in the belemnites suggests that they do not support the Neocoleoidea, and hence that the group may be paraphyletic.

Orange cuttlefish

Orange cuttlefish or Orange squid is the most common English name used for the cuttlefish dish in Cantonese cuisine. It is a siu mei although it is not quite roasted. The dish is most commonly found in Southern China, Hong Kong and overseas Chinatowns.

Sepia (color)

Sepia is a reddish-brown color, named after the rich brown pigment derived from the ink sac of the common cuttlefish Sepia.

The word sepia is the Latinized form of the Greek σηπία, sēpía, cuttlefish.

Sepia (genus)

Sepia is a genus of cuttlefish in the family Sepiidae encompassing some of the best known and most common species. The cuttlebone is relatively ellipsoid in shape. The name of the genus is the Latinized form of the Ancient Greek σηπία, sēpía, cuttlefish.

Sepia apama

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. Using cells known as chromatophores, the cuttlefish can put on spectacular displays, changing color in an instant.

S. apama is native to the southern coast of Australia, from Brisbane in Queensland to Shark Bay in Western Australia. It occurs on rocky reefs, seagrass beds, and sand and mud seafloor to a depth of 100 m.

Sepiadarium kochi

Sepiadarium kochi, common name tropical bottletail squid or Koch's bottletail squid, is an edible species of cuttlefish.

Sepiella inermis

Sepiella inermis, common name spineless cuttlefish, is an edible species of cuttlefish.

Sepiidae

Sepiidae is a family of cephalopods in the order Sepiida.

USS Cuttlefish (SS-171)

USS Cuttlefish (SC-5/SS-171), a Cachalot-class submarine and one of the "V-boats," was the second ship of the United States Navy to be named for the cuttlefish. Her keel was laid down by Electric Boat Company in Groton, Connecticut. She was launched on 21 November 1933 sponsored by Mrs. B. S. Bullard, and commissioned on 8 June 1934, Lieutenant Commander Charles W. "Gin" Styer in command. Cuttlefish was the first submarine built entirely at Electric Boat's facility in Groton, Connecticut; construction of previous Electric Boat designs had been subcontracted to other shipyards, notably Fore River Shipbuilding of Quincy, Massachusetts. Four Peruvian R-class submarines had previously been finished in Groton, using material from cancelled S-boats salvaged from Fore River.

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