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The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]
These are deep water fish that resemble but are not related to barracuda. They are long and slender with pointed snouts. They are hunters with large eyes and sharp teeth. Unlike barracuda, these fish have no swim bladder.
They have no swim bladder. [3] Some species bear photophores. [6] Their early life development is from large eggs directly into yolk sac juveniles that travel in deep waters. [7] The largest species is the Yokozuna slickhead, Narcetes shonanmaruae, which is also the largest completely bathyal teleost fish. [8] [9]
There is no swim bladder; instead, these fish maintain buoyancy with large livers rich in oil. The definition of the clade is unclear with respect to fossil chondrichthyans. Some authors consider it as equivalent to Neoselachii (the crown group clade including modern sharks, rays, and all other descendants of their last common ancestor).
The sucking disc begins to show when the young fish are about 1 cm (0.4 in) long. When the remora reaches about 3 cm (1.2 in), the disc is fully formed and the remora can then attach to other animals. The remora's lower jaw projects beyond the upper, and the animal lacks a swim bladder. [9] Some remoras associate with specific host species.
Swim bladder disease, also called swim bladder disorder or flipover, is a common ailment in aquarium fish. The swim bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy , and thus to stay at the current water depth without having to waste energy in swimming. [ 1 ]
The gill membranes are joined to the isthmus and the gill openings are set widely apart. There is no swim bladder. The counts of vertebrae are 72–89 in Anarhichas and 221–251 in Anarrhichthys. [7] The longest published total length is for Anarrhichthys ocellatus and is 240 cm (94 in). [2]
Alepocephaliformes is an order of marine deep-sea teleost fishes. [2] It was previously classified as the suborder Alepocephaloidei of the order Argentiniformes. [3] [4] [5]As an adaptation to a life in the deep-sea, there is no swim bladder, and the ossification of the skeleton is reduced. [2]