推荐回答(5个)
1、看腹部

公螃蟹的腹部为三角尖形,而母螃蟹的腹部则呈圆形或椭圆形。这样区分螃蟹公母最简单也最方便,人们用眼睛一看就能分清。
2、看蟹脚

母螃蟹蟹脚只有前边两条腿上长有细细的绒毛,而公螃蟹则不同,它们的八条腿上都有密集的绒毛。
3、看蟹黄

螃蟹中有橘红色一粒粒比较硬的是蟹黄,有蟹黄的螃蟹是母螃蟹,蟹黄是螃蟹的卵巢和卵细胞。一般在农历九月前后,雌蟹性腺成熟,蟹肉最为丰满。公螃蟹则没有。
怎么挑选螃蟹?
除了区分公母外,还得会以下几招:
1、看颜色:蟹的背是青色泛亮光的最好。
2、看重量:不是越大的螃蟹越好,买的时候可以对比一下,看同样大的螃蟹哪个重,重的就是肉多的。
3、看尾部,黄多的母螃蟹尾部比较厚实。
说起 阳澄湖大闸蟹如何辨别公蟹与母蟹?答案已经众所周知,最简单,最直接的方式就是看蟹肚。肚脐尖尖,呈三角形的为公蟹:反则肚脐呈圆形就是母蟹了。那阳澄湖大闸蟹用尖脐与圆脐来区别的说法,起源于哪里呢?
随之, 苏蟹阁小编翻阅各大词典,里面概括是这样作出解释的。
引经据典:
出自宋朝陆佃《埤雅》里的一段文字:“蟹,水虫,壳坚而脆,团脐者牝,尖脐者牡也”;团脐就是雌蟹,尖起就是雄蟹。
想必大家都知道,阳澄湖 大闸蟹幼体时期是有尾巴的,尾巴不停地伸屈和弹动,便可以使身体游泳自如,到处觅食,这样倒是有点类似小蝌蚪了。
之后,幼体就蜕壳成了幼蟹,这个小尾巴就自然而然地熨帖在身体的腹面。起初,幼蟹均为狭长形,后来到了成熟期,雌性得肚脐渐渐变成圆形(团脐),雄性则为狭长三角形(尖脐)。

长此以往,百姓口口相传,便就有了“这团脐和尖脐成了识别 阳澄湖大闸蟹雌雄最为明显的标志”的说法。
其实,阳澄湖 大闸蟹的肚脐早期并不以“尖脐和团脐”之称,而是称之为“蜋螘和博带”。恕小编我才疏学浅,读书读的少,“蜋螘”这两个字都不会念!普及下“蜋螘”,读“láng yǐ”。
引经据典:
早在三国魏时期,张揖的《广雅》里已被指出:“其雄曰蜋螘,其雌曰博带。”
所以可能就有了“蜋螘和博带”这样的称呼,但是真正探寻来历、根据和起名的缘由,早已说不清楚了。但是,不可否认的事实是“对于阳澄湖大闸蟹雌雄是以此判别的,已有近两千年之久了”。可能由于“蜋螘和博带”的名称,过于怪异,难以形象的、直观的、通俗的被耳口相传,后就被易于掌握的“尖脐和团脐”名称所取代,从而获得了更多人数、更大范围、更高频率的流传。
一种简单的方法就可以分辨出来,看大闸蟹的腹部可以区分,公蟹穿丁字裤,母蟹则包尿布。也就是说公蟹腹部有一块贴肉长的壳甲是尖形的,母蟹则是圆型的。还有种方法就是将壳打开,如果有黄的那是蟹黄,肯定是母的,如果是白的,那是蟹膏,肯定是公的。公蟹比母蟹肉多。下面让我们看两长图更形象一些。
想区分螃蟹的公、母,就要看螃蟹的底部。底部有一个它的生殖器,如果是圆形的,那就是母的,要是尖的,那就是公的!
根据民间流传的区分螃蟹公母的方法是看它是尖脐还是圆脐,也就是看螃蟹肚子上靠近下方那里的一块小盖子,如果是尖窄的,就是公的,圆宽的就是母的。母的多黄,公的多膏。
女螃蟹屁股大,男螃蟹屁股小,跟人类似。
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