The study estimates that there are only 238 million of the crabs in the bay today, a collapse of 79 million, or nearly a quarter — but scientists say the population could still come back.

For six straight years, the count has been below average, with this year’s estimate of 238 million crabs the second lowest on record. Biologists at the Chesapeake Bay Foundation say the number is cause for concern and are calling for stricter harvest regulations.