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Related Experiment Video

Updated: Nov 29, 2025

Swimming Performance Assessment in Fishes

Swimming Performance Assessment in Fishes

Published on: May 20, 2011

An acute increase in water temperature can decrease the swimming performance and energy utilization efficiency in

Leiming Yin¹, Lei Chen¹, Maolin Wang¹

¹Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, 116023, China.

Fish Physiology and Biochemistry

|November 19, 2020

Summary

Rising temperatures decrease rainbow trout swimming performance and energy efficiency. Increased body mass boosts absolute swimming speed, but relative speed declines, impacting fish physiology and behavior.

Keywords:

Body mass Cost of transport Critical swimming speed Maximum metabolic rate Optimal swimming speed Temperature

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Area of Science:

* Physiological and environmental science
* Aquatic animal physiology
* Fish biomechanics and energetics

Background:

* Rainbow trout (Oncorhynchus mykiss) are commercially important and sensitive to environmental changes.
* Acute temperature fluctuations can significantly impact fish physiology and behavior.
* Understanding thermal tolerance is crucial for aquaculture and conservation efforts.

Purpose of the Study:

* To investigate the effects of acute temperature changes on rainbow trout swimming performance.
* To determine the relationship between temperature, body mass, and metabolic rates.
* To assess the energetic cost of transport at different temperatures.

Main Methods:

* Measurement of critical swimming speed (Ucrit) and oxygen consumption rates (MO2) at varying temperatures (13.2–22.5 °C).
* Determination of Ucrit and MO2 across a range of fish body masses (109.44–249.42 g) at 13.4 °C.
* Calculation of optimal swimming speed (Uopt) and cost of transport (COT).

Main Results:

* Optimal Ucrit observed at 15.2 °C, with performance declining at higher temperatures.
* MO2 and COT significantly increased at higher temperatures (22.5 °C vs. 13.2 °C), indicating reduced energy efficiency.
* Absolute Ucrit and Uopt increased with body mass, while relative values decreased.

Conclusions:

* Acute temperature increases negatively affect rainbow trout swimming performance and metabolic efficiency.
* Body mass influences swimming capacity, with larger fish exhibiting higher absolute speeds.
* Findings provide insights into the physiological and behavioral adaptations of rainbow trout to thermal stress.