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在水产养殖生产和经营过程中,经常涉及动物的雌雄鉴别问题。性别不同,其生长速度、大小、形态、风味等均有不尽相同之处。有的雄性生长快,有的雌性生长快。出于某种需要,有时要进行单性养殖,以便提高产量和效益.于是需要正确鉴别雌雄。人工繁殖过程中更需要准确识别雌雄,便于亲本选留购进及配组。因此雌雄鉴别意义重大,现就目前养殖较热的几种特种水产动物的雌雄鉴别方法简介如下,供参考。 一、罗氏沼虾(Macrobrachium rosenbergii)雄性个体明显地比同龄雌性大。雄虾第二步足强大,呈蔚蓝色,其长度超过体长。头胸部较大,腹部较短;生殖孔开口于第5对步足的基部并形成小突起,第二腹足内肢的内缘有一棒状的雄性附肢,第四、五对步足基部之间的距离较窄。
In the process of aquaculture production and management, it is often involved in the identification of male and female animals. Different gender, its growth rate, size, shape, flavor, etc. are not the same place. Some males grow faster, and some females grow faster. For some needs, sometimes unisexal farming, in order to increase production and efficiency, so the need to correctly identify male and female. The process of artificial breeding more need to accurately identify male and female, to facilitate the parental choose to stay and buy group. Therefore, the identification of male and female is significant, now the breeding of several special aquatic animals hot male and female identification methods are summarized below for reference. First, Macrobrachium rosenbergii males were significantly larger than females of the same age. The second step of male shrimp foot strong, was blue, its length over body length. The head and chest are larger and the abdomen is shorter. The reproductive orifice is open to the base of the fifth pair of foot and forms a small protrusion. The inner edge of the second gastropod inner limb has a rod-shaped male appendage. The fourth and fifth pair of foot base The distance between the narrower.