Giant Freshwater Prawn Welfare in Asian Aquaculture 2026

The giant freshwater prawn (Macrobrachium rosenbergii) is an important aquaculture species in South and Southeast Asia, with welfare considerations gaining attention.

Key Facts

Giant freshwater prawns are farmed extensively in Bangladesh, Thailand, India, and Vietnam
Males develop into different morphotypes with distinct hierarchical behaviour patterns
Dominant males (blue claw) aggressively control access to females and resources
Stocking density strongly influences the proportion of morphotypes and inter-individual aggression
They are harvested by draining ponds, which causes acute handling stress and potential injury

Welfare Considerations

Giant freshwater prawn welfare is shaped by the complex social dynamics of their morphotype system. High stocking densities increase fighting and injury among males, with subordinate individuals experiencing chronic stress and reduced growth. Harvest by pond drainage can cause crowding, aerial exposure, and temperature stress. As evidence of crustacean sentience grows, improving handling, stocking management, and harvest protocols for this species is increasingly important. Research into low-stress harvest methods and optimal stocking ratios is a growing welfare priority.

What You Can Do

Support producers adopting lower stocking densities and improved harvest methods
Advocate for the inclusion of giant freshwater prawns in aquaculture welfare standards
Encourage research into stress indicators and sentience in Macrobrachium species
Choose aquaculture products from producers with transparent welfare and environmental practices