Influence of crude oil exposure on cardiac function and thermal tolerance of juvenile rainbow trout and European sea bass
Résumé
Oil spills pose a threat to aquatic organisms. However, the physiological effects of crude oil on cardiac function and on thermal tolerance of juvenile fish are still poorly understood. Consequently, in this paper, we will present results of two separate experiments where we exposed juvenile rainbow trout and European sea bass to crude oil and made cardiac thermal tolerances and maximum heart rate (f(Hmax)) measurements after 1 week (rainbow trout) and 6-month recovery (sea bass). In both species, the f(Hmax) was lower in crude oil-exposed fish than in the control ones at temperatures below the optimum but this difference disappeared at higher temperatures. More importantly, the oil-exposed fish had significantly higher Arrhenius break point temperature for f (Hmax), which gave an estimate for optimum temperature, than the control fish in both species even though the exposure conditions and recovery times differed between species. The results indicated that exposure of juvenile fish to crude oil did not have a significant negative impact upon their cardiac performance in high temperatures and upper thermal tolerance increased when the fish were tested 1 week or 6 months after the exposure. Our findings suggest that the cardiac function and thermal tolerance of juvenile fish are relatively resistant to a crude oil exposure.
Mots clés
Fish
ACL
Critical thermal maximum
salmon oncorhynchus-nerka
CTMAX
polycyclic aromatic-hydrocarbons
PAH
sole solea-solea
Arrhenius break point temperature
cardiorespiratory function
cod boreogadus-saida
Critical thermalmaximum
Heart rate
mahi coryphaena-hippurus
maximum heart-rate
Oil spill
petroleum-hydrocarbons
dicentrarchus-labrax
mullet liza-aurata
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