生殖孔:之前版上就有人讨论,公鱼的生殖孔尖细、母鱼的圆粗,但是通常要等发情时生殖孔伸出时较易判断,而且所谓的"尖细"、"圆粗"都只是一种相对的形容词,并没有一个很客观的方式判断,所以对一般人来说,这个方法是不太容易的。
···································· 头部 :公鱼的头部会较突起,母鱼的会较圆顺·································································腹部公鱼的腹部平顺,母鱼的腹部微凹································································································································
········································ 体型通常公鱼会较大····························································································颜色就同一窝鱼来说,蓝色基因在公鱼身上是表现出显性基因,因此同一窝的鱼中,公鱼会较蓝,母鱼会较红····················································································