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The blackfin icefish (Chaenocephalus aceratus), also known as the Scotia Sea icefish, is a species of crocodile icefish belonging to the family Channichthyidae. [2] The blackfin icefish belongs to Notothenioidei, a suborder of fishes that accounts for 90% of the fish fauna on the Antarctic continental shelf. [3]
The fish can live without hemoglobin via low metabolic rates and the high solubility of oxygen in water at the low temperatures of their environment (the solubility of a gas tends to increase as temperature decreases). [2] However, the oxygen-carrying capacity of icefish blood is less than 10% that of their relatives with hemoglobin. [16]
Antarctic fish fit these criteria with modifications in swim bladders, development of AFGPs, loss of HSPs and modifications in oxygen transport while inhabiting the same geographic area. Antarctic fish speciation coincides with the separation of Antarctica from Gondwana, a continent composed of Antarctica, Australia, South America and Africa.
Notothenioidei is one of 19 suborders of the order Perciformes. The group is found mainly in Antarctic and Subantarctic waters, with some species ranging north to southern Australia and southern South America. [2] [3] Notothenioids constitute approximately 90% of the fish biomass in the continental shelf waters surrounding Antarctica. [4]
In January 2014 the first nesting Jonah's icefish records were made, [5] and in February 2021 a larger colony estimated to be composed of approximately 60 million Jonah's icefish was found, [6] both colonies were discovered inhabiting the Filchner Trough in the southern Weddell Sea, off the coast of Antarctica between 420 to 535 metres (1,378 ...
An ice core which contains samples of Earth’s atmosphere from five million years ago has been pulled up from the continent’s Ong Valley, researchers have said.
On Dec. 21, 2024, the Antarctic sea ice extent was higher than on Dec. 21, 2016, but the Arctic sea ice extent was lower on that date in 2024 compared to 2016, according to government data.
The Antarctic silverfish (Pleuragramma antarctica), or Antarctic herring, is a species of marine ray-finned fish belonging to the family Nototheniidae, the notothens or cod icefishes. It is native to the Southern Ocean and the only truly pelagic fish in the waters near Antarctica. [2] It is a keystone species in the ecosystem of the Southern ...