Mangrove Crab Welfare in Coastal Aquaculture

Mangrove crabs are farmed in coastal pens across Southeast Asia and the Pacific. Their welfare during fattening, transport, and sale as live animals is a growing concern.

Key Facts

Scylla serrata mud crabs are fattened in pens or net enclosures in mangrove areas
They are traded live to markets, tied or packed in wet conditions for extended periods
Claws are often tied on capture and remain tied throughout transport
They can survive several days out of water but suffer from dehydration and stress
Cannibalism at high density causes limb loss and injury without shell protection

Welfare Considerations

Mangrove crab welfare is compromised across the value chain. Claw tying to prevent cannibalism and injury during transport causes circulatory restriction in the chelipeds. Extended live transport in packed conditions causes chronic stress. Fattening pens at high density lead to fighting and limb loss. While evidence on crustacean pain is still developing, the precautionary approach of minimising handling time, reducing live transport duration, and killing crabs before sale would substantially improve welfare with relatively low cost.

What You Can Do

Support research into crustacean pain and welfare in mangrove crab aquaculture
Advocate for live crab transport duration and condition standards
Ask retailers about welfare standards in their mud crab supply chains
Choose crab products from suppliers with demonstrated welfare improvement commitments