Effects of Acute Temperature Change on Cardiac Performance and Oxygen Consumption of a Marine Fish, the Sea Raven (Hemitripterus americanus)

1989 ◽  
Vol 62 (5) ◽  
pp. 1089-1101 ◽  
Author(s):  
John R. Bailey ◽  
William R. Driedzic
Keyword(s):  
Oxygen Consumption ◽  
Temperature Change ◽  
Marine Fish ◽  
Cardiac Performance ◽  
Sea Raven ◽  
Hemitripterus Americanus

Function of myoglobin in oxygen consumption by isolated perfused fish hearts

1986 ◽  
Vol 251 (6) ◽  
pp. R1144-R1150 ◽  
Author(s):  
J. R. Bailey ◽  
W. R. Driedzic
Keyword(s):  
Oxygen Consumption ◽  
Partial Pressure ◽  
Binding Protein ◽  
Protective Role ◽  
Cardiac Performance ◽  
O2 Consumption ◽  
Hypoxic Conditions ◽  
Sea Raven ◽  
Hemitripterus Americanus ◽  
O2 Binding

Myoglobin, an intracellular O2-binding protein, plays a protective role in maintaining performance of isolated fish hearts under hypoxic conditions. This study was designed to test the hypothesis that the protein contributes to O2 consumption under conditions of increased O2 demand or hypoxia. Isolated myoglobin-rich sea raven (Hemitripterus americanus) hearts and myoglobin-poor ocean pout (Macrozoarces americanus) hearts were perfused under conditions of changing partial pressure of O2 (PO2) and afterload. Sea raven hearts maintained O2 consumption and cardiac performance at low PO2 and high afterload, whereas ocean pout hearts did not. In other cases sea raven and ocean pout hearts were treated with hydroxylamine, which renders myoglobin incapable of binding O2, and subjected to changing PO2 and afterload. Sea raven hearts could not maintain O2 consumption and cardiac performance, whereas hydroxylamine treatment had no effect on O2 consumption in ocean pout hearts under these conditions. These data provide the first evidence to support the concept that myoglobin plays a role in O2 consumption of hearts.

scholarly journals GLUCOSE METABOLISM BY SEA RAVEN (HEMITRIPTERUS AMERICANUS) AND RAINBOW TROUT (ONCORHYNCHUS MYKISS) ERYTHROCYTES

1994 ◽  
Vol 194 (1) ◽  
pp. 167-180 ◽  
Author(s):  
D Sephton ◽  
W Driedzic
Keyword(s):  
Oxygen Consumption ◽  
Rainbow Trout ◽  
Metabolic Rate ◽  
Glucose Disappearance ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Sea Raven ◽  
Extracellular Glucose ◽  
14Co2 Production ◽  
Hemitripterus Americanus

The fate of extracellular glucose in blood isolated from sea raven (Hemitripterus americanus) and rainbow trout (Onchorhynchus mykiss) was determined. In blood from both species incubated in vitro at low physiological pH, the decrease in plasma glucose concentration was more than adequate to support oxygen consumption. Glucose disappearance could not be accounted for by increases in lactate, red blood cell (RBC) glucose or RBC glycogen concentrations. Rates of 14CO2 production from [6-14C]glucose over a 2 h incubation period were less than 1 % of metabolic rate. Only small amounts of label appeared in RBC protein, lipid or glycogen fractions relative to metabolic rates, but label accumulated in the intracellular acid-soluble fraction (presumably free glucose, glycolytic intermediates, amino acids, citric acid cycle intermediates, etc.) at rates consistent with oxygen consumption and glucose disappearance. The simplest explanation for the mismatch between 14CO2 production and the other estimates of metabolic rate is that incubation times were too short for equilibration to occur. A consequence is that studies of this nature cannot use 14CO2 production to elucidate rates of aerobic fuel utilization. By default, the data imply that glucose serves as a primary aerobic metabolic fuel for the RBCs, at least under some conditions.

scholarly journals The Seasonal Intrinsic Cardiac Performance of a Marine Teleost

1985 ◽  
Vol 118 (1) ◽  
pp. 173-183 ◽  
Author(s):  
MARK GRAHAM ◽  
ANTHONY FARRELL
Keyword(s):  
Heart Function ◽  
Cardiac Performance ◽  
Temperature Decrease ◽  
Marine Teleost ◽  
Inotropic Effects ◽  
Sea Raven ◽  
Input Pressure ◽  
Heart Preparation ◽  
Hemitripterus Americanus

1. An in situ heart preparation was used to evaluate cardiac performance in the sea raven, Hemitripterus americanus, under physiological inflow and outflow pressure conditions. Winter and summer fish were subjected to an acute 10°C temperature change from the seasonal ambient value. The maximum cardiac output (V·b) under each temperature condition was determined by altering inflow pressure to the heart. 2. Acute temperature increase produced positive chronotropic and inotropic effects in winter fish. Acute temperature decrease produced a negative chronotropic and inotropic effect in summer fish. 3. The inotropic and chronotropic states of the heart were different in winter and summer fish. Intrinsic heart rate was higher in summer fish at all experimental temperatures. The sensitivity of the summer fish hearts to input pressure was also greater, especially during the warm experimental temperatures. 4. It was evident from heartbeat rate measurements and power output calculations that the advent of summer and winter seasons did not promote any compensatory ability in intrinsic heart function.

Heat transfer between fish and ambient water

1976 ◽  
Vol 65 (1) ◽  
pp. 131-145 ◽  
Author(s):  
E. D. Stevens ◽  
A. M. Sutterlin
Keyword(s):  
Body Wall ◽  
Sea Water ◽  
The Body ◽  
Direct Transfer ◽  
Major Fraction ◽  
Metabolic Heat ◽  
Sea Raven ◽  
Before And After ◽  
Ventral Aorta ◽  
Hemitripterus Americanus

1. The ability of fish gills to transfer heat was measured by applying a heat pulse to blood in the ventral aorta and measuring it before and after passing through the gills of a teleost, Hemitripterus americanus. 2. 80–90% of heat contained in the blood is lost during passage through the gills. 3. The fraction of heat not lost during passage through the gills is due to direct transfer of heat between the afferent and efferent artery within the gill bar. 4. The major fraction of metabolic heat (70 - 90%) is lost through the body wall and fins of the sea raven in sea water at 5 degrees C; the remainder is lost through the gills.

Influence of myocardial isomyosins on cardiac performance and oxygen consumption

1985 ◽  
Vol 130 (3) ◽  
pp. 1314-1323 ◽  
Author(s):  
Joan Wikman-Coffelt ◽  
Richard Sievers ◽  
William W. Parmley
Keyword(s):  
Oxygen Consumption ◽  
Cardiac Performance

scholarly journals Influence of Coronary Flow upon Oxygen Consumption and Cardiac Performance

1963 ◽  
Vol 13 (6) ◽  
pp. 522-528 ◽  
Author(s):  
Howard Weisberg ◽  
Louis N. Katz ◽  
Eugene Boyd
Keyword(s):  
Oxygen Consumption ◽  
Coronary Flow ◽  
Cardiac Performance

Aerobic and anaerobic contributions to energy metabolism in perfused isolated sea raven (Hemitripterus americanus) hearts

1983 ◽  
Vol 61 (8) ◽  
pp. 1880-1883 ◽  
Author(s):  
William R. Driedzic ◽  
Donna L. Scott ◽  
Anthony P. Farrell
Keyword(s):  
Anaerobic Metabolism ◽  
Lactate Production ◽  
Fish Heart ◽  
Atp Production ◽  
Isolated Hearts ◽  
Relative Contribution ◽  
Sea Raven ◽  
Hemitripterus Americanus ◽  
Aerobic And Anaerobic ◽  
Experimental Preparation

The relative contribution of aerobic and anaerobic metabolism to ATP production was assessed in sea raven (Hemitripterus americanus) hearts. The problem was approached by measuring the rates of oxygen consumption and lactate production by perfused isolated hearts performing mechanical work. In the experimental preparation aerobic metabolism could account for essentially all of the ATP synthesized; as such, the organization of metabolism in this fish heart appears similar to reptilian and mammalian hearts under conditions of adequate oxygen availability.

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