Changes of Soluble Protein and Soluble Sugar in Scylla Serrata after Temperature Decreasing Abruptly

Mud crab Scylla serrata is an important economy aquaculture animal living in estuarial waters. Environmental temperature often changes abruptly, so study on biochemical components is important to understand organism adaptation to environment. Biochemistry methods were adopted to determine soluble protein and soluble sugar in gill, hepatopancreas and muscle of Scylla serrata at different times after temperature decreased abruptly. The results showed that soluble protein and soluble sugar increased in 2 h crabs after temperature decreased abruptly, then fluctuated, and at last decreased. Soluble sugar in gill decreased gradually after 2 h, while decreased in fluctuating in hepatopancreas and muscle. Soluble protein and soluble sugar increase at first, is a positive reaction in Scylla serrata for low temperature stress; decrease at last, is caused by decrement of matter and energy in physiological metabolism for low temperature stress.