Marine Life

Horseshoe Crab Welfare and Biomedical Harvesting

Horseshoe crabs are harvested by the millions for their blood used in medical testing, raising significant welfare and conservation concerns.

Key Facts

Horseshoe crabs have blue blood containing a substance called LAL that detects bacterial toxins
An estimated 500,000 crabs are bled annually for pharmaceutical testing
Up to 30% of bled crabs die from the process or complications
They have existed largely unchanged for 450 million years
Shorebirds depend on crab eggs as critical fuel for long migrations

Welfare Considerations

The bleeding process — where crabs are held out of water for hours and up to 30% of their blood removed — causes documented stress responses and mortality. Research shows behavioral changes persisting for weeks after bleeding. The ecosystem impact on migratory birds compounds welfare concerns beyond the crabs themselves.

What You Can Do

Support adoption of recombinant Factor C (rFC) as a cruelty-free alternative to LAL testing
Advocate for pharmaceutical companies to transition away from horseshoe crab bleeding
Back stronger harvest limits and mortality monitoring requirements
Choose healthcare products from companies committed to rFC adoption