Post-Larval Shrimp Welfare in Aquaculture Hatcheries

The post-larval stage of shrimp production in hatcheries is a critical welfare period, with high mortality from disease, handling stress, and transport before nursery and grow-out phases begin.

Key Facts

Post-larval shrimp (PL) are typically transported to farms at PL10-PL15 (10-15 days post-metamorphosis)
Acute mortality syndrome and early mortality syndrome cause catastrophic losses during post-larval culture
Transport stress from oxygen depletion, salinity change, and temperature shock causes significant welfare harm
Stocking density in larval rearing tanks directly affects survival and developmental welfare outcomes
Probiotics and improved water quality management are reducing reliance on antibiotics in shrimp hatcheries

Welfare Considerations

The hatchery stage involves the densest stocking of the shrimp production cycle and the greatest handling stress. Post-larval shrimp are particularly vulnerable to environmental fluctuations and pathogen exposure. Mass mortality events from early mortality syndrome cause the death of millions of individual animals per outbreak. The sentience of larval crustaceans is less certain than adults, but the precautionary principle suggests that welfare consideration during the vulnerable larval phase is warranted. Improved hatchery hygiene and biosecurity reduce the welfare burden of mass disease events.

What You Can Do

Support hatchery welfare research and biosecurity improvements to reduce early mortality syndrome outbreaks
Advocate for antibiotic-free hatchery production as a welfare and food safety standard
Choose shrimp products from supply chains with transparent hatchery practices
Engage with industry bodies on welfare standards covering the full shrimp production cycle including hatchery stages