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河蟹的增大、增重、断肢再生都是在脱壳后实现的。从幼蟹到成蟹大约历经15次脱壳。每次脱壳(最初1小时左右完全丧失抵制敌害和不良环境的能力)都是河蟹生存的难关。要使河蟹安度脱壳关,人工养殖必须抓住以下三点:
Increased crab, weight gain, limb amputation regeneration are achieved after shelling. From crab to crab about 15 times after shelling. Each shelling (the first 1 hour or so completely lost the ability to resist enemy damage and adverse environment) are the crab survival difficulties. To make crabs safely off shellfish, artificial breeding must grasp the following three points: