Among the edible marine crustaceans of India, crabs ranks third by virtue of their importance as an esteemed gourmet and the value of fishery they support. Hatchery technology is available for shrimps and prawns. But commercial hatchery is right now not available for crabs in general and swimming crabs in particular. In this book fishery of ovigerous crabs, embryonic development, salinity requirement for larval rearing and seed production technology is detailed for the benefit of scientists and farmers.