在高级动物——哺乳动物中,是没有性变可能的。然而,对于脊椎动物的鱼和昆虫中的不少种类,性变却是轻而易举的事情。在鱼类中,性变(也称性逆转)最典型的要属黄鳝了。据动物学家研究,黄鳝从受精卵孵化成幼鳝,到长成成鳝,都是雌性,而且都能够产卵。但是,在产过一次卵以后,它们的生殖系统就发生了根本性的变化,原来的卵巢转变成精巢,于是产生精液,这就由雌鳝变成雄鳝了。黄海中的黄鲷鱼,长到110毫 In advanced animals, mammals, there is no possibility of sexual change. However, for many species of vertebrate fish and insects, sexual change is a breeze. In fish, sex change (also called sexual reversal) is most typical of jaundice. According to research by zoologists, Astragalus incubates from a fertilized egg into a larva, and when it grows into a pupa, it is female and both can lay eggs. However, after one egg has been laid, their reproductive system has undergone a fundamental change. The original ovary is transformed into a testis and semen is produced. This changes from a female to a male. The yellow sturgeon in the Yellow Sea grows to 110 millimetres