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河蟹的生长与脱壳关系极为密切。为了增加养殖产量，急需了解河蟹生长与脱壳的生理及生态规律性。而此种动态的规律变化又与河蟹血淋巴中２０─羟基蜕皮酮（２０－ＨＥ）含量有关。２０—ＨＥ是调节河蟹脱壳的分泌激素，河蟹脱壳前后此激素在血淋巴中含量差别极为显著。脱壳素
Crab’s growth and shelling very closely. In order to increase aquaculture production, it is urgently needed to understand the physiological and ecological rules of crab’s growth and shelling. And this dynamic changes in law and crab haemolymph 20-hydroxyecdysone (20-HE) content. 20-HE is a hormone that controls the shelling of crab and crab, and the content of this hormone in hemolymph is very significant before and after crab shelling. Chitin