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Related Experiment Videos

Environment affects stress in exercised turbot.

Erich H Van Ham1, Rogier D Van Anholt, Guus Kruitwagen

  • 1Department of Animal Physiology, Faculty of Science, University of Nijmegen, Nijmegen, The Netherlands. ehvanham@hotmail.com

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|November 14, 2003
PubMed
Summary

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Water temperature and salinity significantly impact juvenile turbot stress responses. Higher temperatures intensify stress indicators like cortisol and lactate, while lower salinity reduces ionic disturbances, suggesting adaptive capacity varies with environmental conditions.

Area of Science:

  • Aquaculture
  • Fish Physiology
  • Environmental Stressors

Background:

  • Turbot aquaculture faces challenges from fluctuating environmental conditions.
  • Understanding fish stress responses is crucial for optimizing farming practices.

Purpose of the Study:

  • To investigate the combined effects of water temperature and salinity on the physiological stress response of juvenile turbot.
  • To elucidate the mechanisms underlying turbot's stress response to environmental changes.

Main Methods:

  • Juvenile turbot were exposed to varying temperatures (10°C, 18°C, 22°C) and salinities (33.5‰, 15‰).
  • Fish underwent a standardized 10-minute enforced exercise test to induce stress.
  • Plasma levels of cortisol, glucose, lactate, Na+, Cl-, and K+ were measured to assess stress indicators.

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Main Results:

  • Elevated temperatures accelerated plasma cortisol, glucose, and lactate increases, with faster recovery of Na+ and Cl-.
  • Lower salinity (15‰) mitigated cortisol response at lower temperatures and reduced overall ionic disturbance.
  • Plasma K+ levels remained unchanged, indicating limited activation of the brain-sympathetic-chromaffin cell axis, especially at lower temperatures.

Conclusions:

  • Turbot stress response is modulated by temperature and salinity, involving the brain-pituitary-interrenal axis (cortisol) and to a lesser extent the brain-sympathetic-chromaffin cell axis (catecholamines).
  • Higher temperatures enhance stress response indicators and recovery, suggesting greater adaptive capacity.
  • Reduced ionic disturbance at lower salinity indicates a beneficial effect, particularly at suboptimal temperatures.