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  • 1
    Electronic Resource
    Electronic Resource
    The aerobic scope of an antarctic fish, Pagothenia borchgrevinki and its significance for metabolic cold adaptation (1987)
    Springer
    Polar biology 8 (1987), S. 155-159 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Resting weight-specific oxygen consumption of the cryopelagic Antarctic nototheniid Pagothenia borchgrevinki at 0°C was 39.6 ml kg-1 · h-1 for a 50 g fish, with oxygen consumption being described by the regression equation: log10 VO2(ml/h)=−1.104+0.825 log10 Mb (g). These values are considerably below those raported by Wohlschlag (1964a,b). VO2 max. in forced swimming was described by the regression equation: log10 VO2 max = −0.507+0.823 log10 Mb. Despite low basal metabolism, factorial aerobic scope is similar to that reported for most other teleost fish, as is the cost of net transport. Myotomal muscles were used only at the highest swimming speeds and once they were recruited the fish fatigued rapidly. After swimming, oxygen debt was repaid rapidly, with a half-time of 20 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297069
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of the heat of the hagfish,Eptatretus cirrhatus (1989)
    Springer
    Fish physiology and biochemistry 6 (1989), S. 327-331 
    Details
    ISSN: 1573-5168
    Keywords: Eptatretus ; hagfish ; heart ; power ; afterload ; stroke volume ; rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The maximum power output of isolated perfused ventricles of the hafish (Eptatretus cirrhatus) averaged 0.367±0.031 mW g−1 (n=9), considerably high than estimates for the heart of the Atlantic hagfish (Myxine glutinosa). Maximal minute volumes averaged 21.55±1.28 ml min−1kg−1, with a mean stroke volume of 0.71±0.14 ml kg−1 body weight, values which are similar to those reported for many teleost and elasmobranch hearts. Ventricular output showed the characteristic dependence upon atrial filling pressure up to an optimum filling pressure ofc. 4 mm Hg. At output pressures exceeding 14 mm Hg the stroke volume and power output fell sharply. At these afterloads, the ventral aorta remained distended following semilunar valve closure and so the volume of fluid ejected on ventricular systole was reduced. There was little change in the frequency of the heart as either input or output pressures were varied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881687
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  • 3
    Electronic Resource
    Electronic Resource
    In vivo calcitropic effect of some vitamin D compounds in the marine Antarctic teleost, Pagothenia bernacchii (1994)
    Springer
    Fish physiology and biochemistry 12 (1994), S. 479-484 
    Details
    ISSN: 1573-5168
    Keywords: Notothenioidei ; calcium ; bone ; efflux ; plasma ; vitamin D3 ; 25-(OH)-D3 ; 1,25-(OH)2-D3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Antarctic notothenioid, Pagothenia bernacchii, were found to have plasma total and free calcium levels, plasma inorganic phosphate and whole body calcium efflux rates which were similar to those seen in other teleosts. But total bone calcium was lower than reported for other teleosts. A single injection of vitamin D3 (5 ng g−1 fish) increased plasma total and plasma free calcium and these increases were associated with an increase in whole body calcium efflux and bone calcification. Conversely, the same treatment with 1,25-(OH)2-D3 reduced plasma free calcium. This seco-steroid also increased the specific activity of 45Ca in bone at 40h post-injection but did not significantly effect total bone calcium, plasma total calcium or whole body calcium efflux. 25-OH-D3 at the same dose had no effect on any of the parameters tested and none of the seco-steroids tested had any effect on plasma total inorganic phosphate. These data show that both D3 and 1,25-(OH)3-D3 can have calcitropic effects in this marine teleost and that these two forms of vitamin D can exert different effects within the same species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004450
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  • 4
    Electronic Resource
    Electronic Resource
    Catecholamine release in heat-stressed Antarctic fish causes proton extrusion by the red cells (1998)
    Springer
    Journal of comparative physiology 168 (1998), S. 345-352 
    Details
    ISSN: 1432-136X
    Keywords: Key words Antarctic ; Catecholamines ; Nototheniid ; Red cell swelling ; Stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Two species of Antarctic fish were stressed by moving them from seawater at −1 °C to seawater at 10 °C and holding them for a period of 10 min. The active cryopelagic species Pagothenia borchgrevinki maintained heart rate while in the benthic species Trematomus bernacchii there was an increase in heart rate. Blood pressure did not change in either species. Both species released catecholamines into the circulation as a consequence of the stress. P. borchgrevinki released the greater amounts, having mean plasma concentrations of 177 ± 54 nmol · l−1 noradrenaline and 263 ± 131 nmol · l−1 adrenaline at 10 min. Plasma noradrenaline concentrations rose to 47 ± 14 nmol · l−1 and adrenaline to 73 ± 28 nmol · l−1 in T. bernacchii. Blood from P. borchgrevinki was tonometered in the presence of isoprenaline. A fall in extracellular pH suggests the presence of a Na+/H+ antiporter on the red cell membrane, the first demonstration of this in an Antarctic fish. Treatment with the β-adrenergic antagonist drug sotalol inhibited swelling of red blood cells taken from temperature-stressed P. borchgrevinki, suggesting that the antiporter responds to endogenous catecholamines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003600050153
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  • 5
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    The aerobic scope of an antarctic fish, Pagothenia borchgrevinki and its significance for metabolic cold adaptation (1987)
    Springer
    Details
    Publication Date: 1987-12-01
    Print ISSN: 0722-4060
    Electronic ISSN: 1432-2056
    Topics: Biology
    Published by Springer
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