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The AACC Horseshoe Crab Survey of 2026
We conduct the bulk of our surveying at high tide during 3-4 days surrounding the full and new moons in May, June and July.
We provide training, supplies and other needs.
Please reach out to tldomanski@aacc.edu for more information.
The goal of this project is to involve citizen scientists identifying spawning beaches and counting HSCs. There has not been a systematic effort to map all Chesapeake Bay beaches and determine how heavily each beach is utilized. Without this information it is difficult to manage the Chesapeake horseshoe crab population.
You can participate in multiple ways: 1) spot and report, 2) collecting blood samples for DNA studies on HSCs (directions at hemolymph collection project) , 3) tagging (contact tldomanski@aacc.edu). If you spot a crab that is already tagged that can be reported at https://www.fws.gov/crabtag/ .
All you need to conduct a survey is a willingness to go out looking at your local beach (or contact us to go out to a site in another community that needs volunteers for the survey).
If you'd like to participate and choose your own site to survey, you are welcome to survey any beach near you where you have access.
To do this:
1) Decide which beach you would like to survey. Any sandy beach, of any size, is a potential spawning beach. It could be at a park, or it could be a neighborhood beach where you have access.
Once you have chosen a beach, decide if you would like to go at night or during the day (or both). More crabs spawn at night, however some beaches are only available during the daytime.
2) Decide on a day, and time. The best time to look for horseshoe crabs is at a spring (high) tide in late May, June or July. This means a full or new moon. We usually survey a beach about an hour before the high tide time. That’s when female crabs emerge from the water with their males for spawning. The chart below the instructions lists the days and times for high tides during this period for the Annapolis area, but more specific high tide information can be found at https://dnr.maryland.gov/fisheries/pages/tide-finder.aspx . The information can also be found using the "tide finder" on the Maryland DNR website.
If you have a smartphone and want to upload the data directly, then you can follow the directions below. If you want to record the data on a hard copy, a form is attached here or you can just write down the information and we are happy to pick it up at your convenience.
3)Download the free "Anecdata" app onto your smartphone. Once you have entered your email address, you can search for our project. We are called “Chesapeake Horseshoe Crab Survey”.
4) Walk the beach within an hour of high tide. The app will ask for "weather" - enter conditions. It will also ask for "beach" - type the name of the beach you are surveying. You can enter this information just once, if you like, at the beginning of the survey.
5) If you see a spawning female crab, enter that as an observation. The app will ask you for #females and #males. For example, if you were to see one female with three associated males, you would enter "1" for females and "3" for males. The larger female is typically buried in the sand, with one or more smaller males over her.
6. If you'd like, take a picture, and submit that as well. There are also data prompts for tag# and carapace width. If you see a crab with a small white circular tag attached (very unlikely), enter the tag number. Don't worry about carapace width.
7. Continue down the beach, and submit each spawning female/male group as a new observation until you've completed a single pass. Done! The program automatically submits username, time, date, and GPS coordinates.
If you have questions or comments, email me tldomanski@aacc.edu .
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