Sex-related differences in aerobic capacities and reactive oxygen species metabolism in the silver eel.
Silver European eels (Anguilla anguilla L.) need to develop important aerobic capacities to cope with their long fasting spawning migration at depth, particularly males which are about half the size of females. Moreover, they have to face potential oxidative stress because reactive oxygen species (ROS) production is linked to the increase in metabolic rate. Thus, aerobic metabolism was globally evaluated in male and female silver eels exposed to a 10.1 MPa hydrostatic pressure (1,000 m depth). Oxygen consumption (MO(2)), ROS production and antioxidant enzyme activities were measured in the muscle fibres. Males showed a trend in both higher rate of aerobic metabolism and ROS production than females. After pressure exposure, ROS production was inversely correlated to metabolic rate only in males. By facilitating MO(2) rise with no harmful effects by ROS, the supposed enhanced aerobic capacities of males could speed up the sustained swimming. In females, the tendency to lower metabolic rate and higher catalase activity would make them less vulnerable to ROS effects. These results are in agreement with the hypothesis for different migration depths between genders.
Amérand
A
A
EA 4324 ORPHY, UFR Sciences et Techniques, Université Européenne de Bretagne, Université de Brest, 6 avenue LE GORGEU, CS 93837, 29238, BREST Cedex 3, France. aline.amerand@univ-brest.fr.
Vettier
A
A
EA 4324 ORPHY, UFR Sciences et Techniques, Université Européenne de Bretagne, Université de Brest, 6 avenue LE GORGEU, CS 93837, 29238, BREST Cedex 3, France.|EA 2069, Unité de Recherche "Vignes et Vins de Champagne" Stress & Environnement, Laboratoire d'Eco-Toxicologie, UFR Sciences Exactes et Naturelles, Université de REIMS Champagne-Ardenne, Campus du Moulin de la Housse, BP 1039, 51 687, Reims Cedex 2, France.
Moisan
C
C
EA 4324 ORPHY, UFR Sciences et Techniques, Université Européenne de Bretagne, Université de Brest, 6 avenue LE GORGEU, CS 93837, 29238, BREST Cedex 3, France.
Belhomme
M
M
EA 4324 ORPHY, UFR Sciences et Techniques, Université Européenne de Bretagne, Université de Brest, 6 avenue LE GORGEU, CS 93837, 29238, BREST Cedex 3, France.
Sébert
P
P
EA 4324 ORPHY, UFR Sciences et Techniques, Université Européenne de Bretagne, Université de Brest, 6 avenue LE GORGEU, CS 93837, 29238, BREST Cedex 3, France.
D000704:Analysis of Variance; D025041:Animal Migration / Q000502:physiology; D000818:Animals; D001837:Body Weights and Measures; D004524:Eels / Q000378:metabolism / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D017665:Hydroxyl Radical / Q000378:metabolism; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D011312:Pressure; D017382:Reactive Oxygen Species / Q000378:metabolism*; D012727:Sex Characteristics; D013053:Spectrophotometry
D017382:Reactive Oxygen Species; D017665:Hydroxyl Radical
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