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Octopuses can maintain a constant oxygen uptake even when oxygen concentrations in the water decrease to around 3.5 kPa (0.51 psi) [22] or 31.6% saturation (standard deviation 8.3%). [17] If oxygen saturation in sea water drops to about 1–10% it can be fatal for Octopus vulgaris depending on the weight of the animal and the water temperature ...
Many species are found in the twilight zone, while others live closer to shore in warmer waters. However, some species, like the dumbo octopus, live in the midnight zone where sunlight never reaches.
Both octopuses and squids have mantles (referenced above) which function towards respiration and locomotion in the form of jetting. The composition of these mantles differs between the two families, however. In octopuses, the mantle is made up of three muscle types: longitudinal, radial, and circular.
Octopus is eaten in many cultures, such as those on the Mediterranean and Asian coasts. [163] The arms and other body parts are prepared in ways that vary by species and geography. Live octopuses or their wriggling pieces are consumed as ikizukuri in Japanese cuisine and san-nakji in Korean cuisine.
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.
Octopus is the largest genus of octopuses, comprising about 100 species. These species are widespread throughout the world's oceans. Many species formerly placed in ...
Mimic octopus showing typical pattern. The mimic octopus was first discovered off the coast of Sulawesi, Indonesia in 1998 on the bottom of a muddy river mouth. [5] [6] It has since been found to inhabit the Indo-Pacific, ranging from the Red Sea and Gulf of Oman in the west to New Caledonia in the east, and Gulf of Thailand and the Philippines in the north to the Great Barrier Reef in south.
Many octopuses use a projection of ink in order to startle and distract predators. And it is common that octopuses will swim and use jet-propulsion to escape predators quickly. Additionally, the ability to squeeze into places predators may not be able to fit and/or reach allows individuals to hide. [ 13 ]