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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?
Exercise Stress Test01:26

Exercise Stress Test

Introduction
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Definition
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Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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Exercise and Cardiovascular Response

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Related Experiment Video

Updated: Jun 1, 2026

A Swimming-Induced Zebrafish Exercise Apparatus for Versatile Training Approaches
10:34

A Swimming-Induced Zebrafish Exercise Apparatus for Versatile Training Approaches

Published on: October 18, 2024

Fish under exercise.

Arjan P Palstra1, Josep V Planas

  • 1Departament de Fisiologia, Facultat de Biologia, Universitat de Barcelona and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Av. Diagonal 645, 08028 Barcelona, Spain. arjan.palstra@wur.nl

Fish Physiology and Biochemistry
|May 26, 2011
PubMed
Summary

Exercise in fish farming enhances muscle growth, flesh quality, and welfare. This approach offers a natural, economical method to improve aquacultured fish, benefiting both the fish and consumers.

Area of Science:

  • Fish physiology
  • Aquaculture science
  • Fisheries science

Background:

  • Growing need for knowledge on fish swimming physiology due to environmental changes, fishing pressures, and aquaculture expansion.
  • Increased concern for fish well-being in both natural and farmed environments.

Purpose of the Study:

  • To review existing data on the effects of sustained exercise on teleost fish.
  • To explore the applications of fish swimming physiology in fisheries science and aquaculture.
  • To discuss the potential of exercise as a tool for improving aquacultured fish.

Main Methods:

  • Review of existing scientific literature on fish swimming physiology and exercise.
  • Synthesis of data on the impacts of sustained exercise on fish growth, muscle, flesh quality, ovarian development, and immune status.

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Using Touch-evoked Response and Locomotion Assays to Assess Muscle Performance and Function in Zebrafish

Published on: October 31, 2016

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Last Updated: Jun 1, 2026

A Swimming-Induced Zebrafish Exercise Apparatus for Versatile Training Approaches
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Published on: October 18, 2024

Swimming Performance Assessment in Fishes
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Swimming Performance Assessment in Fishes

Published on: May 20, 2011

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Using Touch-evoked Response and Locomotion Assays to Assess Muscle Performance and Function in Zebrafish

Published on: October 31, 2016

  • Organization of the FitFish workshop to gather multidisciplinary experts, industrial partners, and policymakers.

    • Main Results:

    • Sustained exercise at optimal speeds promotes muscle growth and positively affects flesh quality in fish.
    • Exercise may delay ovarian development and stimulate immune status in aquacultured fish.
    • Exercise presents a natural, noninvasive, and economical strategy to enhance fish growth, flesh quality, and welfare.

    Conclusions:

    • Improved understanding of fish swimming physiology is crucial for sustainable aquaculture and fisheries management.
    • Exercise is a promising, cost-effective method to improve the health, quality, and welfare of farmed fish.
    • Findings support policy decisions and future research directions in fish physiology and aquaculture.