Delaware Bay shore survey data starting with 1999 which denotes peak spawning occurrences by day and lunar period, proportion of spawning in May (coinciding with shorebird stopovers), average water temperature, index values for female and male crabs per square meter by beach and bay-wide, the annual sex ratio, and index of abundance per beach.

A map-based application that will show the home states of the volunteers that participated in the annual horseshoe crab surveys. Click play in the application to view the data in the timeline.