The Effect Of Several Environmental Matrices On The Growth And Death Of Procamburas Clarkii

For providing a scientific basis for crayfish farming,the effect of several environmental matrices on Procamburas clarkii is studied in this paper.1.Research on the effect of sediment on the growth and death of post-larvae of crayfish.The result is that sediment can significantly promote the growth of crayfish(P<0.01).2.Research on the effect of sediment on the growth and death of different size of crayfish populations.The results are shown as follows.(1)Sediment can significantly promote the growth of crayfish populations(the small size of crayfish and the middle size of crayfish P<0.01,the large size of crayfish P<0.05).(2)Sediment can significantly reduce the death rate of the small size of crayfish(P<0.05).(3)Sediment can significantly enhance the resistance of different size of crayfish to hypoxia(P<0.01).3.Research on the effect of three kinds of leaf litter on the growth and death of post-larvae population of procamburas clarkii.The results are shown as follows.(1)Three kinds of leaf can significantly promote the growth of crayfish(P<0.01).(2)The triple leaf litter of Italy poplar can significantly promote the growth of crayfish(P<0.01),but the triple leaf litter of paper mulberry and drooping willow not(P>0.05).(3)The leaf litter of Italy poplar can significantly reduce the death rate of crayfish(P<0.01).(4)The leaf litter of paper mulberry and drooping willow can both significantly increase the death rate of crayfish(P<0.01).(5)The difference between Two concentrations of different kinds of leaf litter are small(P>0.05).4.Research on the effect of three kinds of leaf litter on the growth and death of post-larvae population when there is mud.The results are shown as follows.(1)Compared with control,both of mud control and three kinds of leaf can significantly promote the growth of crayfish(P<0.05).(2)Compared with mud control,both of Italy poplar leaf litter and drooping willow leaf litter can significantly promote the growth of crayfish(P<0.05),but paper mulberry leaf litter cannot(P>0.05).(3)Compared with control,both of mud control and Italy poplar leaf litter can significantly reduce the death rate of crayfish(P<0.05),but both of paper mulberry leaf litter and drooping willow leaf litter can increase the death rate of crayfish(P<0.05).(4)The difference of death rate between mud control and Italy poplar leaf litter is small(P>0.05).5.Research on the effect of homogenate of leaf and fruit of sweet-scented osmanthus and camphor on the death rate of post-larvae.Related data were collected and analyzed.The results are shown as follows.(1)The lethal substance comes from the supernatant,because the death rate of crayfish with the treatment of the supernatant and homogenate were the same.(2)The lethal effect of crayfish with the treatment of homogenate of fruit of camphor is the highest,then fruit of sweet-scented osmanthus and leaf of sweet-scented osmanthus.6.Research on the effect of homogenate of three kinds of aquatic plants,bulrush,water peanuts and cress on the death rate of post-larvae.The result is that the lethal effect of crayfish with the treatment of homogenate of cress is the highest,then water peanuts and root of bulrush.In summary,the results are shown as follows.(1)Sediment can promote the growth of crayfish.(2)Sediment can reduce the death rate of small size of crayfish.(3)Leaf litter of three kinds of trees can promote the growth of post-larvae of crayfish.(4)Leaf litter of drooping willow and paper mulberry can increase the death rate of post-larvae of crayfish.(5)The lethal effect of crayfish with the treatment of homogenate of fruit of camphor is the highest,then fruit of sweet-scented osmanthus and leaf of sweet-scented osmanthus.(6)The lethal substance comes from the supernatant of homogenate.(7)The lethal effect of crayfish with the treatment of homogenate of cress is the highest,then water peanuts and root of bulrush.According to the results,several advices are shown as follows.(1)Sediment is necessary to culture of crayfish,especially industrial farming of crayfish.(2)It's inappropriate to farm crayfish under the forest of drooping willow,paper mulberry,sweet-scented osmanthus and camphor,but Italy poplar is appropriate.(3)Planting cress and water peanuts in crayfish pool is inappropriate,but bulrush is appropriate.