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The Blue Crab Roller Coaster

More ups and downs

Will 101 million spawning-age females produce a sustainable future for Chesapeake Bay’s blue crabs?
    That’s the $64,000 question raised by this year’s Winter Dredge Survey, Maryland Department of Natural Resources’ census of crabs asleep in the mud of the Bay.
    The population is well — more than half — below the target female population of 215 million. This year shows an uptick. But the survey’s 24-year history has been consistently up and down. Only two years — 2010 and 2011 — have surpassed the target. Four — including 2014 — have fallen to or below the much lower threshold of 70,000, meaning a depleted population. On the chart, this year is average below average.
    Crab fishery managers use the Dredge Survey results to determine how many crabs can be harvested. This year, commercial female catch is allowed but regulated. Recreational crabbers must return females to the water.
    Better news is the rising total of crabs living in the Bay: 411 million, despite the hard winter. Only 10 years of the survey have found higher numbers, and seven of those years were in the 1990s. The other three highs coincided with or followed the boom female years of 2010 and 2011.
    That, said DNR Secretary Mark Belton, “is good news for the crabs and for Marylanders who enjoy them all summer long.”
    Read the full survey at http://tiny.cc/lgsjxx.