Current status of the stock of mud crabs was examined in December 1997 in the Matang Mangrove Forest, Malaysia. Scylla serrata accounted for 63% of the crab stocks and S. olivacea for 37%. According to their size, 80% of the mud crabs were estimated to be immature. Reduction in the size of the mud crabs was likely to be due to overfishing. Zoning for different levels of fishing in Matang was proposed as a practical measure for mud crab stock management.