The offset molting cycle is the reason female crab molts appear on Oregon beaches earlier than those of males. It takes rock crab shells between 2-3 months to fully harden. Male crab—see the narrow abdomen. Female crab. Female crabs are called “hens”; male crabs are called “cocks.” Males are very narrow tails and larger claws. [1] Distribution This crab is found from Point Reyes, California to Baja California, Mexico. Crabs often show marked sexual dimorphism.Males often have larger claws, a tendency that is particularly pronounced in the fiddler crabs of the genus Uca ().In fiddler crabs, males have one greatly enlarged claw used for communication, particularly for attracting a mate. Distinctive are the antennae that begin between the … Male crab on the left and female crab on the right—the females get to go back to the sea; the males, if big enough become dinner. Female Crabs: A mature (adult) female blue crab, known as a "Sook," is identified with an inverted "U" or bell-shaped apron and red-tipped claws. [2] Females moult their shells during the fall so that they remain soft during mating. Crabs will stay in this “pre-mating embrace” until females molt, this can go on as long as two weeks. The first thing a crabber should know is how to tell a male from a female, since it is currently unlawful to keep females. Females have broader tails that are somewhat heart-shaped. Underside of a female rock crab—this crab will be tossed back into the ocean. However, after the second year, males typi cally grow faster than females, reaching 14 cm by the seventh year in comparison to 8.9 cm for females. Look at the underside of the crab. More simply, the bottom of a female crab … 2.Male crabs have a smaller, more triangular, or rocket-shaped underbelly markings compared to the female crabs’ broader or dome-like marking. [1] Males’ bodies grow up to 17 cm (6.5 inches) and females’ bodies up to 11 cm (4.5 inches). After females molt, male spermatophores are deposited and the embrace often continues for protection of the newly molted female. Emily holding a rock crab. 4.Male blue crabs have blue-colored claw tips while their female counterparts have reddish claw tips. This event for males happens during the winter months to ensure that their shells are completely firm before the fall. If the abdomen, the flap of shell that folds under from the rear end of the crab, is wide and rounded, the crab is a female. Crabs, like these red rock crabs, often engage in a premating hug in which the male will wrap his claws and legs around the female. [1] Life history Its life span is at least four years. The red tips, of course, blend in with the overall color of the crab once it has been cooked, or steamed. Before mating commences, both male and female rock crabs moult their shell. 3.A female crab usually appears to have some fertilized eggs tucked in-between its body and flap. Male adults have massive claws and legs longer than female adults. If the abdomen is narrow, it is a male. Alternate Name: Pacific rock crab, California rock crab, brown rock crab or just plain rock crab. • Specify gender: Crab gender is easy to distinguish: male crabs (or "jimmies") have a narrow, T-shaped "apron" on the back of their shell, while female crabs ("sooks") have a wide apron. Identification: Rock crabs have a wide, hard shell with black-tipped pincers on claw s that are large and smooth. the first two years, both female and male juvenile rock crab will grow from 1.4 to 4 cm in carapace width. The diet of juvenile and adult rock crab Shells during the winter months to ensure that their shells during the winter months to fully harden have claw! 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