Study on selection and spatial distribution of two kinds of caverns for Procambarus clarkii

We investigated the selection adaptability and spatial distribution ratio, distribution of sex ratio inside or outside different caves, as well as the quantity and sex ratio in single cave of Procambarus clarkii in two kinds of caves (staked bamboo tube and PVC tube) during artificial breeding. The results show that P. clarkii tended to hide in caves (Group A: 83.47%, Group B: 89.87%), especially in bamboo cave Group B: bamboo tube (71.80%) and PVC tube (11.63%). Vertical placement of the cave will affect the distribution of P. clarkii which prefered to hide in the caves at middle and lower layers as well at lower layer, and the quantity reduced from bottom to top. P.clarkii had a phenomenon of polygyny cohabitation, but the laws of male and female distribution in different vertical spaces were not obvious, with the highest ratio of male and female in the lowerest layer of Group A (3.43:1) and the uppermost layer of Group B bamboo cave (2.86:1).