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Related Experiment Video

Updated: Aug 26, 2025

Handling and Tagging Techniques for Implanting Juvenile American Shad with a New Acoustic Microtransmitter

Handling and Tagging Techniques for Implanting Juvenile American Shad with a New Acoustic Microtransmitter

Published on: June 14, 2024

Capture heats up sharks.

Lucy Harding¹, Austin Gallagher², Andrew Jackson¹

¹Department of Zoology, Trinity College Dublin, D02 PN40, Ireland.

Conservation Physiology

|October 3, 2022

Summary

This summary is machine-generated.

Catch-and-release fishing significantly raises shark body temperatures, impacting their physiology. This rapid heating and subsequent cooling may affect shark welfare and ecology, requiring further investigation.

Keywords:

body temperature capture catch-and-release physiology shark thermal ecology

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Area of Science:

Marine Biology
Fish Physiology
Ecotoxicology

Background:

Catch-and-release fishing is prevalent in ecotourism and research.
The physiological impacts of capture on sharks are not well understood.
Sharks are particularly vulnerable due to their physiology.

Purpose of the Study:

To investigate the physiological effects of catch-and-release fishing on blue sharks and tiger sharks.
To quantify changes in body temperature and blood chemistry post-capture.
To assess the implications for shark welfare and ecology.

Main Methods:

Biologging and blood chemistry analysis were used.
Subcutaneous body temperature was measured in 19 sharks (blue and tiger).
Temperature data loggers provided post-release measurements for six sharks.

Main Results:

Capture caused rapid and significant increases in shark body temperature (up to 2.7°C).
Blue sharks exhibited higher temperature increases and heating rates compared to tiger sharks.
Post-release, body temperatures gradually returned to ambient water temperatures within 10-40 minutes.

Conclusions:

Short-term capture induces acute physiological stress in sharks, evidenced by rapid body temperature increases.
The observed temperature fluctuations may have short- and long-term consequences for shark health.
Further research is needed to understand the broader ecological implications of these capture-induced physiological changes.