Grouping on beach: When mating, male horseshoe crabs move parallel to the shoreline on sandy flats and intercept females as they pass by. A male attaches himself to the top of a female’s shell by using his specialized front claws, in a position known as amplexus, and together they crawl to the beach.

Grouping on beach:
When mating, male horseshoe crabs move parallel to the shoreline on sandy flats and intercept females as they pass by. A male attaches himself to the top of a female’s shell by using his specialized front claws, in a position known as amplexus, and together they crawl to the beach.

News Release By Frank McCloy | FWC

A ritual dating back millions of years takes place again this spring on Florida beaches. Spring marks horseshoe crabs’ mating season, and biologists with the Florida Fish and Wildlife Conservation Commission (FWC) want the public’s help identifying spawning sites.

Beachgoers will likely have the best luck spotting mating horseshoe crabs around high tide, just before, during or after a new or full moon. The conditions around the new moon this Wednesday, March 9, and the full moon on March 23 will create ideal opportunities to view the spawning behavior of horseshoe crabs.

Mating crabs “pair up,” with the smaller male on top of the larger female. Other male crabs may also be present around the couple. Beachgoers lucky enough to spot horseshoe crabs are asked to note how many they see and whether the horseshoe crabs are mating. If possible, the observer should also count how many horseshoe crabs are mating adults and how many are juveniles (4 inches wide or smaller).

Horseshoe crab group: During the spring, horseshoe crabs congregate along Florida's shores to spawn. Each year, our biologists ask the public to report observations of horseshoe crab mating activities in order to help identify nesting beaches around the state. The public can visit our website the report their sightings, and they can also email reports to horseshoe@myfwc.com or call 866-252-9326. To learn more about our annual horseshoe crab survey, visit our website.

Horseshoe crab group:
During the spring, horseshoe crabs congregate along Florida’s shores to spawn. Each year, our biologists ask the public to report observations of horseshoe crab mating activities in order to help identify nesting beaches around the state. The public can visit our website the report their sightings, and they can also email reports to horseshoe@myfwc.com or call 866-252-9326. To learn more about our annual horseshoe crab survey, visit our website.

In addition, biologists ask observers to provide the date, time, location, habitat type and environmental conditions – such as tides and moon phase – when a sighting occurs.

The FWC asks the public to report sightings through one of several options. Go to MyFWC.com/Contact and go to “Horseshoe Crab Nesting Activity” for the “Submit a Horseshoe Crab Survey” link, then select “Florida Horseshoe Crab Spawning Beach Survey.” You can also report findings via email at horseshoe@MyFWC.com or by phone at 866-252-9326.

The survey program began in April 2002. Through 2015, the FWC has received 3,485 reports from across Florida.

Horseshoe crabs, often called “living fossils,” are an important part of the marine ecosystem. Their eggs are a food source for animals. Birds, such as red knots, rely on horseshoe crab eggs to fuel their long migrations to nesting grounds.

Horseshoe crabs have also proved valuable to human medicine. Pharmaceutical companies use horseshoe crab blood to ensure intravenous drugs and vaccine injections are bacteria-free and sterile. Scientists are also using horseshoe crabs in cancer research. Read more…

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