Wels Catfish Welfare in Aquaculture and Sport Fishing

Wels catfish are large, long-lived predatory fish whose welfare needs in aquaculture and catch-and-release sport fishing deserve greater attention.

Key Facts

• Wels catfish (Silurus glanis) can grow to over 2.5 metres and live 80+ years
• They are highly stress-sensitive during handling — prolonged air exposure causes physiological collapse
• Wels catfish are intelligent predators with individual recognition of familiar humans in some studies
• In aquaculture, they require large tank volumes and hiding opportunities for psychological wellbeing
• Catch-and-release fishing of large wels catfish carries significant mortality risk from handling stress

Welfare Considerations

Wels catfish welfare deserves attention proportional to their remarkable biology — these long-lived, potentially highly sentient predators can live for decades and may have sophisticated cognitive abilities. In aquaculture, their large body size and predatory nature requires substantial tank volume, appropriate water quality management, and hiding structures that reduce chronic stress. In sport fishing, catch-and-release of large wels catfish carries serious welfare risks — prolonged air exposure, inappropriate handling, and warm water conditions all contribute to post-release mortality that may reach 30-50% in stressed individuals. Welfare best practice for catch-and-release includes minimal air exposure, use of cradles for unhooking in water, and avoidance of fishing in warm conditions.

What You Can Do

• Support angling clubs that implement wels catfish catch-and-release best practice guidelines
• Unhook wels catfish in the water using a cradle to minimize air exposure time
• Avoid wels catfish fishing when water temperatures exceed 22°C — mortality risk increases dramatically
• Provide hiding structures and adequate tank volume in wels catfish aquaculture systems
• Support research into wels catfish cognitive abilities and welfare needs