NJDEP Bureau of GISAtlantic horseshoe crabs (Limulus polyphemus) are an ecologically significant and imperiled species in the Delaware Bay. Due to over-harvesting and habitat degradation and loss, horseshoe crab populations declined and a moratorium on horseshoe crab harvest was imposed in New Jersey in 2008. Recovery efforts are currently underway. One ongoing conservation program is reTURN the Favor (RTF), a large-scale citizen science project where volunteers walk transects of spawning beaches, rescuing horseshoe crabs that have been stranded, overturned, or trapped in natural or manmade impingement hazards before these crabs die from exposure or predation. As a complement to data documenting the number of crabs rescued by volunteer efforts after being overturned or trapped in different impingements on known spawning beaches in the Delaware Bay, this layer provides polygons demonstrating beach extent walked by RTF volunteers. Together, these data provide a foundation for identifying structures that constitute a hazard to horseshoe crabs and understanding the relative importance of different beaches and potential impingements in horseshoe crab survival.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/e2e807fee96145a1940676b097c7a101_39engNew Jersey Department of Environmental Protection's (NJDEP) Bureau of GISPublicHorseshoe Crab Spawning Beaches in New Jersey [New Jersey]Web servicesNew JerseyLast Modified: 2022-08-24