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Sea slugs respire through a gill (or ctenidium). Aquatic respiration is the process whereby an aquatic organism exchanges respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excreting carbon dioxide and some other metabolic waste products into the water.
The physiology of underwater diving is the physiological adaptations to diving of air-breathing vertebrates that have returned to the ocean from terrestrial lineages. They are a diverse group that include sea snakes, sea turtles, the marine iguana, saltwater crocodiles, penguins, pinnipeds, cetaceans, sea otters, manatees and dugongs.
The Fitzroy River turtle is capable of obtaining up to 70% of its oxygen needs from the water through its cloaca, in a process called cloacal respiration. [7] This allows the Fitzroy River turtle to remain underwater for up to three weeks. [8]
Like other amniotes (reptiles, birds, and mammals) they breathe air and do not lay eggs underwater, although many species live in or around water. Turtle shells are made mostly of bone ; the upper part is the domed carapace , while the underside is the flatter plastron or belly-plate.
Turtles, like other reptiles, breathe air, not water. They have lungs, not gills like fish, and so even if they live mostly in the water, they need to come up to the surface to breathe now and again.
However, the streamlined body plan reduces friction and drag in the water and allows sea turtles to swim more easily and swiftly. The leatherback sea turtle is the largest sea turtle, reaching 1.4 to more than 1.8 m (4.6 to 5.9 ft) in length and weighing between 300 and 640 kg (661 to 1,411 lbs). [11]
Sea turtles must surface to breathe, but not as often as you think. Diving and hunting sea turtles can stay down anywhere from five to forty minutes. While asleep, sea turtles can stay down for ...
Leatherback sea turtles enjoy a gelatinous diet of jellyfish and sea squirts, the WWF reports. Red-eared slider turtles may chow down on earthworms, snails, slugs and leafy greens, according to ...