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Like many other notothenioid fishes, it lacks a swim bladder. [2] Bone density increases during maturation, resulting in reduced buoyancy and the transition from pelagic to demersal swimming behavior. [13] Adults N. coriiceps possess a dense, well-developed skeleton compared to its congener Notothenia rossii, accounting for its reduced buoyancy ...
They also possess aglomerular kidneys, an adaptation that aids the retention of these antifreeze proteins. [ 16 ] While the majority of animal species have up to 45% of hemoglobin (or other oxygen-binding and oxygen-transporting pigments) in their blood, the notothenioids of the family Channichthyidae do not express any globin proteins in their ...
Notothenia rockcods have some adaptations that allow them to thrive in such inhospitable habitat, like antifreeze proteins in their blood [6] and ample fat to insulate them against heat loss and to offset their lack of a swim bladder. [7]
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Nototheniidae species have no swim bladder, however, they have other depth-related adaptations, such as increased fatty tissues and reduced mineralization of the bones, resulting in a body density approaching neutral, to fill a variety of niches. [8] The spleen may be used to remove ice crystals from circulating blood.
Emerald rockcod juveniles exhibited none of these symptoms under laboratory conditions. [18] However, when exposed to both elevated water temperatures and elevated CO 2 levels, this species ability to acclimate to the warmer water was reduced, perhaps as an energy conservation strategy.
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The crocodile icefish or white-blooded fish comprise a family (Channichthyidae) of notothenioid fish found in the Southern Ocean around Antarctica.They are the only known vertebrates to lack hemoglobin in their blood as adults. [2]