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Showing 1 to 8 of 8 for “"Antarctic Fish"”.
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Behavioral freeze avoidance in an Antarctic fish
Freeze avoidance is vital for the survival of Antarctic notothenioid fishes inhabiting the ice-laden waters of the high-latitude Southern Ocean. Most notothenioids avoid freezing primarily by the action of their blood-borne antifreeze glycoproteins (AFGPs). AFGPs arrest the growth of environmental …
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Antifreeze Glycopeptides of Antarctic Fish: Comparative Aspects of Their Biochemistry and Physiology
… glycopeptides (AFGPs) in the blood of polar fishes allows fish to live in ice-laden seawater at a temperature below what colligative properties would dicate to be the freezing point of their blood. AFGPs are well-characterized from two antarctic species, Pagothenia borchgrevinki and …
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Effect of environmental temperature on Antarctic fish antifreeze protein activity and concentration
… profiles. The low latitudes of the western Antarctic Peninsula (WAP) experience freezing sea surface water temperatures and ice formation only during the austral winter but the water below 100 m is warmer due to the effects of the Circumpolar Deep Water (CDW) that flows onto the shelf. …
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Effect of Blood Volume Manipulations and Warm Acclimation on Cortisol Levels in the Antarctic Teleost Trematomus bernacchii
Antarctic fish, such as the Trematomus bemacchii, maintain a serum osmolality of around 600 mOsm, nearly twice that of temperate fish. This high serum osmolality seawater surrounding Antarctica. Upon warm acclimation Antarctic fish lower their serum osmolality, increase their drinking rate, and …
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"Characterization of an antifreeze glycopeptide gene from the Antarctic cod, Notothenia neglecta, and a functional study of the ""pre-"" sequence of this antifreeze glycopeptide"
The antarctic fish, Notothenia neglecta, synthesizes a series of 8 different-sized antifreeze glycopeptides (AFGP 1 to 8) which lower the freezing point of its body fluids below that of sea water. I report here the sequence of one of its AFGP genes. The structural gene contains 46 tandemly repeated …
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The influence of environmental temperature on the thermal tolerance of Antarctic notothenioid fishes
The evolution of the Antarctic notothenioid fishes in the chronically cold waters of the Southern Ocean has resulted in a remarkably narrow thermal tolerance shared among most extant species. While most of these fishes have the capacity to accommodate the physiological challenges of low …
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The Na/K-ATPase in the gills of Antarctic and New Zealand nototheniids: The Physiologic and Molecular Effects of Warm-acclimation.
Antarctic fish, living in -2°C waters, have a serum osmolality of « 600mOsm/kg nearly double that of temperate teleosts. The increase in serum osmolality is due to proportional increases in the Na" and CT concentrations as compared to temperate teleosts, including members of the same family. The …
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Effects of Hyperoxia on Thermal Tolerance and Indicators of Hypoxic Stress in Antarctic Fishes That Differ in Expression of Oxygen-Binding Proteins
Antarctic icefishes (Family Channichthyidae) are unique in lacking the oxygen carrier hemoglobin (Hb) in their blood, leaving them with only 10% of the oxygen-carrying capacity observed in closely related red-blooded fishes. Previous studies have shown that icefishes have lower critical thermal …