|Big blue octopus|
Octopus cyanea, also known as the big blue octopus or day octopus, is an octopus in the family Octopodidae. It occurs in both the Pacific and Indian Oceans, from Hawaii to the eastern coast of Africa. O. cyanea grows to 16 cm in mantle length with arms to at least 80 cm. This octopus was described initially by the British zoologist John Edward Gray in 1849; the type specimen was collected off Australia and is at the Natural History Museum in London.
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Living as it does on coral reefs, and hunting by day, O. cyanea is adept at camouflage and not only can change colour frequently, but also can change the patterns on and texture of its skin. One researcher observed it change its appearance 1000 times in seven hours. As it moves across the seabed it makes changes in its colouring and appearance to match the substrate beneath. The colour changes are instantaneous and made by chromatophores under direct control of the brain. This octopus sometimes produces a "passing clouds" display when stationary near prey such as a crab; this mimics a dark shadow passing across its surface and may encourage the crab to move incautiously.
O. cyanea is found on reefs and in shallow waters in the Indo-Pacific. Its range extends from the Red Sea, the East African coast, and Madagascar, to southeastern Asia, Oceania, and as far as Hawaii.
While most species of octopus are nocturnal, O. cyanea is diurnal, although mostly crepuscular, being active at dawn and dusk. It maintains a den to which it returns after foraging; a rock crevice, a hidden place under an overhang, a hiding place among coral heads, or a hole excavated in rubble or sand.
It is a predator and searches the reef for fish, crabs, shrimp, and molluscs. Small items may be eaten where they are caught, while larger items are carried back to the den for consumption. Crabs may be killed by a bite and given an injection of toxic saliva, then chewed up in the beak of the octopus, while molluscs may have their shells drilled and the animal inside being predigested to ease extraction. Empty mollusc shells and crab carapaces are discarded outside the den, forming a midden.
They sometimes engage in cooperative hunting with the roving coral grouper.
O. cyanea has a lifespan of 12–15 months after settling from the planktonic larval state. During this time, it grows from about 67 to 6,500 g (0.1 to 14.3 lb). Its growth curve is nearly exponential and it converts its prey into new growth with an efficiency greater than 50%, relying on protein for growth, energy production, and energy reserves.
In captivity, it breeds at any time of year, probably depending on when the female reaches maturity. Mating may become cannibalistic. However Octopus cyanea will socially tolerate other individuals by sharing tanks and dens and with typically no loss to cannibalism or escape. They also exhibit significant levels of social repulsion, and individuals often chose a solitary den when given the option. The male may mate with several different females, but after this, the suckers on the edge of his webbing expand in size. During the next two to three months, they continue enlarging while the octopus goes into a decline and dies. Meanwhile, the female remains beside her eggs that are deposited in a den, and dies soon after they hatch.
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In the Hawaiian language, the octopus is called generically as heʻe', or heʻe mauli to distinguish it from the night octopus (heʻe pūloa) species.[a] Of these, only the day octopus was typically eaten by the natives.[b] A traditional method of capture made use of a cowrie shell lure to attract the octopuses.
Source: "Octopus cyanea", Wikipedia, Wikimedia Foundation, (2023, February 21st), https://en.wikipedia.org/wiki/Octopus_cyanea.
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- ^ Allcock, L.; Taite, M.; Headlam, J.; Allen, G. (2018). "Octopus cyanea". IUCN Red List of Threatened Species. 2018: e.T163055A967286. doi:10.2305/IUCN.UK.2018-2.RLTS.T163055A967286.en. Retrieved 16 February 2022.
- ^ a b Bouchet, Philippe (2010). "Octopus cyanea Gray, 1849". WoRMS. World Register of Marine Species. Retrieved 26 April 2017.
- ^ a b "Octopus cyanea:Big blue octopus". Encyclopedia of Life. Retrieved 1 May 2017.
- ^ a b c d "Day octopus". Monterey Bay Aquarium. Retrieved 26 April 2017.
- ^ a b Norman, M.D. 2000. Cephalopods: A World Guide. ConchBooks.
- ^ Current Classification of Recent Cephalopoda
- ^ a b c "Day Octopuses, Octopus cyanea". MarineBio. Archived from the original on 9 November 2017. Retrieved 1 May 2017.
- ^ Hanlon, Roger T.; Messenger, John B. (1998). Cephalopod Behaviour. Cambridge University Press. p. 38. ISBN 978-0-521-64583-6.
- ^ Mather, Jennifer A.; Mather, D. Lynn (2004). "Apparent movement in a visual display: the 'passing cloud' of Octopus cyanea (Mollusca: Cephalopoda)". Journal of Zoology. 263 (1): 89–94. doi:10.1017/S0952836904004911.
- ^ Chung, Wen-Sung; Kurniawan, Nyoman D.; Marshall, N. Justin (November 2021). "Comparative brain structure and visual processing in octopus from different habitats". Current Biology. 32 (1): 97–110.E4. doi:10.1016/j.cub.2021.10.070. PMID 34798049.
- ^ "Octopus cyanea: Big blue octopus". SeaLifeBase. Retrieved 26 April 2017.
- ^ Vail, Alexander L.; Manica, Andrea; Bshary, Redouan (2013). "Referential gestures in fish collaborative hunting". Nature Communications. 4 (1): 1765. Bibcode:2013NatCo...4.1765V. doi:10.1038/ncomms2781. PMID 23612306.
- ^ a b van Heukelem, William F. (1973). "Growth and life-span of Octopus cyanea (Mollusca: Cephalopoda)". Journal of Zoology. 169 (3): 299–315. doi:10.1111/j.1469-7998.1973.tb04559.x.
- ^ New Scientist. Reed Business Information. 3 November 1983. pp. 333–334. ISSN 0262-4079.
- ^ Hanlon, Roger T.; Forsythe, John W. (March 2008). "Sexual cannibalism by Octopus cyanea on a Pacific coral reef". Marine and Freshwater Behaviour and Physiology. 41 (1): 19–28. doi:10.1080/10236240701661123. S2CID 83800950.
- ^ Edsinger, Eric (2020). "Social tolerance in Octopus laqueus—A maximum entropy model". PLOS ONE. 15 (6): e0233834. Bibcode:2020PLoSO..1533834E. doi:10.1371/journal.pone.0233834. PMC 7286511. PMID 32520975.
- ^ a b Evenhuis, N. L.; Eldredge, Lucius G. (2004). Natural History of Nihoa and Necker Islands. Bishop Museum bulletin in cultural and environmental studies 1. Bishop Museum Press. pp. 154–155. ISBN 9781581780291.
- ^ a b Pukui, Mary Kawena; Elbert, Samuel H. (1986) . "he'e // he'e mākoko // he'e pūloa". Hawaiian Dictionary: Hawaiian-English English-Hawaiian. Bishop Museum bulletin in cultural and environmental studies 1 (Revised and Enlarged ed.). University of Hawaii Press. p. 63. ISBN 9780824807030.
- ^ "Octopus". Waikīkī Aquarium. 2013-11-21. Retrieved 14 September 2021.
- "CephBase: Octopus cyanea". Archived from the original on 2005.
- Photos of Octopus cyanea on Sealife Collection
- Articles with 'species' microformats
- Articles with short description
- Cephalopods described in 1849
- IUCN Red List least concern species
- Marine molluscs of Asia
- Molluscs of Hawaii
- Molluscs of Oceania
- Molluscs of the Indian Ocean
- Molluscs of the Pacific Ocean
- Short description is different from Wikidata
- Taxa named by John Edward Gray
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