Prime - Market size. Portunids - Members of the swimming crab family to which the Atlantic Blue Crab belongs. Punk crab - See Sponge Crab . Rank or rank peeler - Red sign peeler, already weak, approximately two hours prior to molt. Red sign , red rim or red line crab - Hard crabs which will molt in less than two days.
Amateurs can usually detect the red sign, but with considerable practice.
See also white sign and pink sign. Click here to see images . Sally crab - Young, immature, female crab. Salt and pepper disease - A crab which has been infected with parasites which appear as small dark specks throughout its meat. See Crab Diseases .