1　上浮死亡的原因在亲鳖越冬期间 ,常发生亲鳖上浮水面后 ,逐渐死亡的现象 ,造成损失 ,影响效益。这是由以下四个方面的因素所致。1.1　亲鳖内伤重大部分亲鳖都是外购的野生鳖。由于捕鳖方法的局限 ,有些野生亲鳖当时看似健壮 ,实际上有内伤。有的运输时群堆集装 ,互相挤压、 1 floating cause of death during the winter months of soft-shelled turtle, soft-shelled turtle floating surface, the phenomenon of gradual death, resulting in loss and affect the efficiency. This is due to the following four factors. 1.1 pro-turtle internal injuries most of the soft-shelled Turtle are purchased wild turtle. Due to the limitations of the method of catching turtles, some wild soft-shelled turtles may seem robust at that time, but in fact they have internal injuries. Some transport group pile container, squeeze each other,