The first thing a crabber should know is how to tell a male from a female, since it is currently unlawful to keep females. the first two years, both female and male juvenile rock crab will grow from 1.4 to 4 cm in carapace width. • 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. 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. 4.Male blue crabs have blue-colored claw tips while their female counterparts have reddish claw tips. 3.A female crab usually appears to have some fertilized eggs tucked in-between its body and flap. It takes rock crab shells between 2-3 months to fully harden. Female crab. [1] Males’ bodies grow up to 17 cm (6.5 inches) and females’ bodies up to 11 cm (4.5 inches). Male adults have massive claws and legs longer than female adults. The diet of juvenile and adult rock crab [2] [1] Distribution This crab is found from Point Reyes, California to Baja California, Mexico. [1] Life history Its life span is at least four years. Alternate Name: Pacific rock crab, California rock crab, brown rock crab or just plain rock crab. 2.Male crabs have a smaller, more triangular, or rocket-shaped underbelly markings compared to the female crabs’ broader or dome-like marking. Male crab—see the narrow abdomen. Females moult their shells during the fall so that they remain soft during mating. 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. If the abdomen is narrow, it is a male. Emily holding a rock crab. This event for males happens during the winter months to ensure that their shells are completely firm before the fall. 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. Before mating commences, both male and female rock crabs moult their shell. Female crabs are called “hens”; male crabs are called “cocks.” Males are very narrow tails and larger claws. The red tips, of course, blend in with the overall color of the crab once it has been cooked, or steamed. 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. Distinctive are the antennae that begin between the … After females molt, male spermatophores are deposited and the embrace often continues for protection of the newly molted female. 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