Yes, you can eat horseshoe crabs in some parts of the world, but it is risky, highly regulated in many places, and often discouraged today because of both food safety and conservation concerns.

Are horseshoe crabs edible?

  • Certain species and parts (mainly the eggs/roe and a small amount of claw meat) are traditionally eaten in parts of East and Southeast Asia, such as Thailand, Japan, and Taiwan.
  • The meat is described as white and rubbery , with a slightly salty, “sea” aftertaste, and the eggs have a firm, rubbery texture.
  • In practice, most of the “dish” is the eggs and salad or seasoning around them, not a big chunk of meat.

Important: Toxic species

  • Not all horseshoe crabs are safe to eat, and one species, the mangrove horseshoe crab (Carcinoscorpius rotundicauda), is poisonous to humans because it can contain tetrodotoxin, the same type of potent neurotoxin found in some pufferfish.
  • Tetrodotoxin is not destroyed by cooking heat, so grilling, boiling, or frying does not make a toxic crab safe.
  • There have been repeated poisonings and even deaths in Thailand and nearby countries from people eating the wrong species or improperly prepared animals.

How are edible ones prepared?

Where people do eat them, there are fairly specific traditions:

  • The crab is usually steamed or grilled whole first, then opened so the eggs can be scooped out.
  • In Thai-style dishes, the grilled roe is often mixed with sour unripe mango, chilies, fish sauce, lime, nuts, and herbs as a spicy salad.
  • Internal white organs such as the gut sac are removed and discarded because they are considered inedible and potentially slightly toxic.

Legal and conservation issues

  • The American horseshoe crab (Limulus polyphemus), found on the U.S. East Coast, is listed as “vulnerable to extinction” by the IUCN.
  • In some regions (for example, parts of Florida), killing horseshoe crabs is illegal, and many scientists argue that harvesting them for food or bait worsens population declines and harms shorebirds that rely on their eggs.
  • Modern guidance from conservation-minded sources increasingly says that eating horseshoe crabs and their eggs is not sustainable and should generally be avoided.

Simple safety takeaway (for non-experts)

If you’re not:

  • In a region where horseshoe crabs are traditionally eaten,
  • Absolutely sure of the species, and
  • Following local laws and an experienced, local preparation method,

then the safest, most responsible answer to “can you eat horseshoe crabs?” is effectively no, you shouldn’t —because of real poisoning risk and conservation concerns.

TL;DR:
People in some Asian countries do eat specific species of horseshoe crabs (mostly the eggs), but one species is outright poisonous, cooking does not remove the toxin, and some populations are legally protected or vulnerable, so for most people it’s neither safe nor ethical to try.

Information gathered from public forums or data available on the internet and portrayed here.