Freshwater Fish Welfare: Rivers and Angling

Freshwater fish in rivers and lakes face welfare threats from pollution, habitat degradation, and angling practices, with growing evidence that catch-and-release fishing causes significant stress.

Key Facts

Catch-and-release angling is practised widely as a conservation measure but is not harm-free
Studies show that cortisol levels remain elevated for hours after handling and release in many species
Barbless hooks reduce tissue damage but do not eliminate the trauma of capture
Electrosurvey methods used by scientists cause stress and disorientation in fish
Pollution events kill millions of freshwater fish annually in the UK through oxygen depletion and chemical contamination

Welfare Considerations

Freshwater fish welfare is affected by a range of human activities that are poorly regulated from a welfare perspective. Angling causes acute stress from capture, handling, and air exposure; the growing practice of photographing fish before release extends the welfare impact. Pollution events cause mass mortality through suffocation and chemical damage. Habitat degradation through abstraction, run-off, and channelisation reduces the structural complexity that fish need for predator avoidance, feeding, and breeding. Addressing freshwater fish welfare requires both regulatory reform and changes in recreational fishing practices.

What You Can Do

Minimise air exposure time if practising catch-and-release angling
Keep fish in the water when unhooking and photographing to reduce stress
Support water quality enforcement to prevent pollution events in local rivers
Advocate for stronger water quality regulations for agricultural run-off
Donate to river restoration organisations working to improve freshwater fish habitat