Stress responses of larval turbot, Scophthalmus maximus L., exposed to sub-lethal concentrations of petroleum hydrocarbons |
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| Authors: | SM Stephens JA Brown SC Frankling |
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| Institution: | (1) Department of Biological Science, Hatherly Laboratories, University of Exeter, Exeter, EX4 4PS, UK |
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| Abstract: | Turbot larvae were exposed to dilutions of the water soluble fraction (WSF) of crude oil (1–25%), in a laboratory flow-through system. Whole body immunoreactive cortisol (IRC) content of premetamorphic 345 degree C day and early metamorphosing 450 degree C day larvae (23 and 30 days post hatch, respectively) was elevated when exposed to 25% WSF for 6 h, but the lower WSF concentrations did not induce IRC elevations. Larvae of 450 degree C days exposed to WSF for 6 h and then left in clean sea water for 24 h showed recovery of IRC, whilst the IRC content of 450 degree C day larvae exposed to WSF for 30 h remained elevated. Whole body thyroxine content of 345 degree C day larvae exposed to 25% WSF for 6 h was significantly elevated, which may have implications for larval development/metamorphosis. However, whole body triiodothyronine content of these larvae was not altered by WSF-exposure. Furthermore, larvae of 450 degree C days, WSF-exposed for 6 h or 30 h showed no thyroidal disturbance. Larvae of 345 degree C days exhibited significantly elevated whole body adrenaline and noradrenaline content after exposure for 6 h to 25% WSF; however, more diluted WSF did not influence adrenaline or noradrenaline content. These studies have demonstrated that larvae of 345 and 450 degree C days can successfully mount endocrine stress responses but that environmentally realistic concentrations of petroleum hydrocarbons do not induce these responses. |
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| Keywords: | catecholamines corticosteroids thyroid hormones petroleum hydrocarbons stress fish larvae Scophthalmus maximus turbot |
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