Aquaculture

Farmed Prawn Hypoxia Stress Welfare

Hypoxia is a critical welfare threat in intensive prawn farming, causing stress responses and mortality that can be prevented through aeration management.

Key Facts

Prawns require dissolved oxygen above 4mg/L for normal function
Hypoxia below 2mg/L causes rapid mortality in intensive systems
Night-time oxygen depletion from phytoplankton respiration is a common welfare risk
Paddle wheel aerators and air diffusers maintain oxygen in intensive ponds
Automated dissolved oxygen monitoring enables rapid response to hypoxic events

Welfare Considerations

Hypoxia causes acute physiological stress in prawns - impaired respiration, elevated stress hormones, and in severe cases death. Chronic low-level hypoxia causes ongoing welfare compromise through reduced immunity and growth. Aeration management is a welfare essential in intensive prawn production.

What You Can Do

Choose shrimp from farms with automated aeration and oxygen monitoring
Support certification schemes that include oxygen management requirements
Advocate for mandatory dissolved oxygen standards in prawn welfare regulations