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Osmoregulation in Fishes02:32

Osmoregulation in Fishes

When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
Hypoxia01:23

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Mitochondrial responses to anoxia-reoxygenation exposure in crucian carp (Carassius carassius).

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Differential production of mitochondrial reactive oxygen species between mouse (Mus musculus) and crucian carp (Carassius carassius).

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Phosphoproteomic changes in response to anoxia are tissue-specific in the anoxia-tolerant crucian carp (<i>Carassius carassius</i>).

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Maintained mitochondrial integrity without oxygen in the anoxia-tolerant crucian carp.

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A Simple Approach to Manipulate Dissolved Oxygen for Animal Behavior Observations
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Published on: June 28, 2016

Does size matter for hypoxia tolerance in fish?

Göran E Nilsson1, Sara Ostlund-Nilsson

  • 1Physiology Programme, Department of Molecular Biosciences, University of Oslo, P.O. Box 1041, N-0316 Oslo, Norway. g.e.nilsson@imbv.uio.no

Biological Reviews of the Cambridge Philosophical Society
|April 10, 2008
PubMed
Summary
This summary is machine-generated.

Body size has minimal impact on fish oxygen uptake during hypoxia. However, larger fish benefit from greater energy reserves and slower accumulation of toxic byproducts, offering a survival advantage in severe oxygen deprivation.

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Area of Science:

  • Physiological Ecology
  • Aquatic Biology
  • Comparative Physiology

Background:

  • Fish exhibit a wide range of body sizes and frequently encounter fluctuating oxygen levels.
  • Previous research on the influence of body size on fish hypoxia tolerance has yielded conflicting results.

Purpose of the Study:

  • To synthesize existing data and current physiological understanding of hypoxia tolerance in fish.
  • To clarify the role of body size in fish adaptation to low-oxygen environments.

Main Methods:

  • Review and integration of historical and contemporary empirical data on fish hypoxia tolerance.
  • Analysis of physiological mechanisms governing oxygen uptake and anaerobic metabolism.
  • Examination of species-specific adaptations to extreme hypoxia.

Main Results:

  • Body size has little direct effect on oxygen uptake capacity under hypoxia; variations are often linked to lifestyle and habitat.
  • Larger fish possess an advantage during severe hypoxia and anoxia due to higher metabolic reserves and slower buildup of lethal anaerobic byproducts.
  • Extreme hypoxia adaptations, such as specialized hemoglobins and ethanol production, demonstrate natural selection's significant role, often overriding size-scaling effects.

Conclusions:

  • Fish hypoxia tolerance is influenced by a complex interplay of physiological scaling, metabolic rate, and adaptive strategies.
  • While larger size offers benefits in severe oxygen depletion, evolutionary adaptations can be more critical for survival in extreme hypoxic conditions.
  • Understanding these factors is crucial for predicting fish responses to environmental changes, particularly in oxygen-limited aquatic ecosystems.