I do not think Delaware waters are believed to have the same impact on the Crabs and other species of marine life as the Chesapeake when it comes to a breeding ground for marine life.
This is not to say it should be ignored by any means but when it comes to a Salt Water Estuary the Chesapeake is hands down in this country. Even it's original name may portray its wonders. The Chesapeake Bay: The Chesapeake Bay is the largest estuary in North America. The Chesapeake Bay Watershed includes an area of 64,299 square miles. An estuary is a partially enclosed area where the fresh water from rivers mixes with tidal salt water. The Chesapeake Bay was formed over 10,000 years ago when melting glacial ice caused sea levels to rise in the Atlantic Ocean. The rising waters of the Atlantic Ocean backed up into the Susquehanna River Valley, creating a new bay. The bay that was created by the flooding of the Susquehanna was know as Chesepiooc, meaning "Great Shellfish Bay," by the Algonquin Indians who were living around the bay when the first European settlers arrived.
The above is a disputed issue by Linguists. However Chesepiooc is the largest Salt Water Estuary in the US.