Horseshoe Crabs: Time to Say Goodbye to Their Harvest

The horseshoe crab has lived for about 475 million years, helping keep people safe from harmful bacteria. For half a century it has been caught in huge numbers across the United States, especially along Massachusetts’ coast. Most of these crabs are drained for a test that checks if medicines contain dangerous toxins. The rest are sold as bait to fishermen. In Massachusetts, a third of the 340 000 crabs taken for medicine are killed afterward. The ones that survive lose up to a third of their blood, feel confused, and often fail to return to the shore to lay eggs. These eggs are a vital food source for tiny fish, which in turn feed larger fish and shorebirds. When the eggs disappear, birds such as the red knot suffer because they can no longer rely on them during long migrations. Long‑time scientists have shown that the loss of horseshoe crabs has already weakened coastal food webs. Beaches that once buzzed with spawning crabs and the birds that depend on them are now quiet. Past bounty programs encouraged fishermen to kill millions of crabs, thinking they were pests that ate shellfish. Even after those programs ended, the practice of catching crabs for medicine and bait continued.

Today, many big drug companies are switching to lab‑made alternatives that can replace the need for crab blood. The U. S. Food and Drug Administration, along with agencies in Europe and the WHO, now approve these synthetic tests. Companies like Eli Lilly have already cut their use of crab blood by 80 percent. Other firms, including Bristol Myers Squibb and Bayer, are following suit. Some tests still require real crab blood, but only a few thousand crabs are needed for those. States with larger crab populations can supply them without harming ecosystems. In Connecticut and New York, lawmakers have already banned crab fishing for medicine. Massachusetts has a chance to join them. A new bill would stop crab harvesting by 2029, ending the cruel practice and allowing ecosystems to recover. Support comes from conservation groups and even some fishermen who say alternative baits exist. If passed, the state’s shores could soon buzz with crabs laying eggs at night and birds returning by day. The Monomoy National Wildlife Refuge already shows early signs of recovery after a long‑standing ban. It is time to protect these ancient animals that have protected us for millions of years.

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