News and Press

All News

More Tweets

State Beach Season Passes
Air Pollution Control Preconstruction Permits
Air Pollution Control Operating Permits
Freshwater Wetlands
OWTS (Septic) Permitting
OWTS (Septic) Licensing
Stormwater Permitting Info
All Other Water Permits
Aboveground Storage Tank Registration
Underground Storage Tanks
Permitted Waste Transporters
Online Hunting/Fishing/Boating
Rec Freshwater Fishing Licenses
Rec Saltwater Fishing Licenses
Marine Fisheries License Renewals
Shellfish Harvester Certification
Boat Registration Renewal
Berthing & Land Management Customer Portal
Online Renewals/Fee Payments
Agriculture Product Permit Renewals
RIPDES Permit Annual Fee Payment Service
Hazardous Waste Transporter Permit Renewals
Medical Waste Generator Registration
UST Registration Renewal
Marine Fisheries License Renewals
Dental Amalgam Containing Mercury Waste Recycling Annual Report Form
Online Permit Searches
OWTS (Septic) Permits
Wetlands Permits
Water Quality Certifications / Stormwater Permits
Multi-Sector General Permits
Non-Contact Cooling Water Permits
Remediation General Permits
Other Resources
Application Forms
Permit Application Center
Request a File Review
Rules and Regulations

Horseshoe Crab Spawning Survey

  • Juvenile HSC

    Juvenile Horseshoe Crab

  • Spawning HSC

    Spawning horseshoe crabs

Every year, horseshoe crabs (Limulus polyphemus) make their way to the shores of Rhode Island to engage in a lunar and tidal driven spawning event. Female horseshoe crabs crawl onto the beach during the new and full moons during late spring and early summer to lay eggs in a concentrated nest. Male horseshoe crabs follow shortly behind them to fertilize up to 4,000 eggs per nest. In less than a month, the juvenile horseshoe crabs emerge and make their way back to the water.

Survey Design and Methods
Two stretches of beach are currently involved in this monitoring survey. The northern site, located in Conimicut, is a residential shorefront measuring approximately .3 miles. The southern site, located in the Napatree Point Conservation Area, is a protected shorefront measuring approximately 1.25 miles. During the new and full moons of May, staff scientists visit each site at the evening high tide to count how many horseshoe crabs are visible in shallow water and on shore. These counts include individuals as well as mating groups.

Sampling Frequency
Locations are sampled annually on the new and full moons during the month of May.

For more information about the survey please contact Natalie Ameral

View More Surveys
Quick Links
+ Public Meetings/RI Marine Fisheries Council
+ Commercial Fishing/Dealer Resources
+ Recreational Saltwater Fishing
+ Fisheries Science & Research
+ Additional Resources
+ Boating Resources
Contact Marine Fisheries
3 Ft. Wetherill Rd.
Jamestown, RI 02835
Phone: 1-401-423-1923
Fax: 1-401-423-1925