在仔、幼鳖期间,从外部形态特征上很难鉴别出雌雄。鳖达到性成熟以后,在外部形态上各自发生不同的变化,在外观上便可鉴别出雌雄(见图1、图2)。雌鳖的整个鳖体较厚,背甲为前后基本一致的椭圆形,中部较平,腹甲为“+”字形;雄鳖整个鳖体较薄,背甲为后部较前部宽的椭圆形,中部隆起,腹甲为曲瓦形。雌鳖尾部较短,不能自然伸出裙边外;雄鳖尾长尖,能自然伸出裙外边。雌鳖较雄鳖体后部宽,同龄体重轻, In Aberdeen, juvenile turtle period, from the external morphological characteristics is difficult to identify male and female. When turtles reach sexual maturity, they undergo different changes in their external appearance, and the male and female can be identified in appearance (see Figure 1 and Figure 2). The whole body turtle body turtle body thick, carapace is consistent before and after the oval, the middle of the flat, plastron for the “+” shape; male turtle entire turtle body thin, carapace to the back of the front of the wide oval Shaped, central uplift, plastron for the tile-shaped. Female turtle tail shorter, not naturally out of skirts; male turtle tail tip, can naturally extend skirt outside. Female turtles than male turtle body wide rear, the same age, light weight,