The effect of 9 min of net confinement on two marine teleost species, the flounder and the Atlantic salmon, was investigated in order to gauge how different species respond to the same stress stimulus. Net confinement in both species induced significant elevations in plasma cortisol, glucose, lactate, osmolality, and monovalent ion levels; the responses to net confinement in salmon were generally of a greater magnitude. In both species, handling induced significant alterations in PFFA levels though there were marked species differences in the qualitative and quantitative aspects of this response. Plasma protein levels were significantly elevated only in the flounders. In general, the two species responded similarly to the net confinement with differences only in the absolute levels and durations of the responses.

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Turbot Scophthalmus maximus were cannulated via the afferent branchial artery and were either net-confined in sea water or in air for 9 min to monitor the stress response of a hatchery-reared marine flatfish. No mortality was observed. Aerial exposure appeared to mobilize plasma free fatty acids and stimulate the interrenal tissue but had no effect on circulating glucose or lactate levels. This pattern was qualitatively similar to that induced by net-confinement in sea water, although the magnitude and duration of the changes were more marked in the turbot handled in sea water. Aerial exposure had no effect on plasma osmolality, protein, or Cl concentrations and only a minor effect on plasma Na + concentrations, which was in sharp contrast to the ionoregulatory disturbance noted in turbot which were net-confined in sea water. However, plasma K + and cortisol concentrations were similarly elevated by both handling procedures. The results from these experiments suggest that whilst similarities with the salmonid physiological stress response are apparent, the lack of a plasma glucose response may represent a fundamental difference in turbot stress physiology.1995 The Fisheries Society of the British Isles

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