Mud Crab Fattening is the process of stocking juvenile crabs (10 g to 250 g) and allowing them to moult and grow. Astro Aquaculture is providing 100% organic fattening mud crabs for exporting. Mud Crab Fattening is the process of stocking juvenile crabs (10 g to 250 g) and allowing them to moult and grow. Astro Aquaculture is providing 100% organic fattening mud crabs for exporting. Mud Crab Fattening is the process of stocking juvenile crabs (10 g to 250 g) and allowing them to moult and grow. Astro Aquaculture is providing 100% organic fattening mud crabs for exporting.