小龙虾的变种，世界唯一的单性繁殖虾，不分公母，可以交配生殖，一只也可以生殖（LGBT的极致？）。淘宝有售，可以群养，群养时间长了很容易爆缸。1990年代出现在德国水族市场，没有天然原生种群（只有流失到野外的种群），来源至今不明。基因测序表明此虾是佛罗里达螯虾（除了常见的麻辣小龙虾之外还有橙色、蓝色、白色变种观赏虾）的近亲，但弄不清楚它是杂交的还是突变的还是转基因的。经过调查，当年最初销售它们的水族商众说纷纭，都记不清这虾是怎么来的了。

维基百科原文

Marmorkrebs
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  (Redirected from Marble Crayfish)


Marmorkrebs, or marbled crayfish, are parthenogenetic crayfish that were discovered in the pet trade in Germany in the 1990s.[2] Marmorkrebs are closely related to the "slough crayfish", Procambarus fallax.[3] P. fallax is widely distributed across Florida,[4] but no natural populations of marmorkrebs are known. Information provided by one of the original pet traders as to where the marmorkrebs originated was deemed "totally confusing and unreliable".[5] Marmorkrebs is German for "marbled crayfish".

Contents

• 1 Model organism
• 2 Invasive species
• 3 References
• 4 External links

Model organism
Marmorkrebs are the only known decapod crustaceans to reproduce by parthenogenesis.[2] All individuals are female, and the offspring are genetically identical to the parent.[6] Because marmorkrebs are genetically identical, easy to care for,[7] and reproduce at high rates, they are a potential model organism, particularly for studying development.[8] A major drawback, however, is the long generation time (several months) compared to other research organisms.[9]

Invasive species
Marmorkrebs have caused concern as a potential invasive species[2] because only a single individual is needed to establish a newpopulation, and they can reproduce at high rates. They have since been introduced into natural ecosystems on three continents. They have been found in the wild in Germany,[5][10][11] Italy,[12] the Netherlands,[13] Sweden, [14] Madagascar,[15] and Japan,[16] probably through release or escape from aquaria. Although most reports of marmorkrebs in the wild in Europe have consisted of only single individuals,[10] several established populations have now been documented in Europe.[17]
The Madagascar population is growing rapidly,[15] causing concern among local authorities.[18]
Although no cases of marmorkrebs have been found in the wild in North America, they are widely distributed among hobbyists in the North American pet trade.[19] Due to concerns about the possible damage caused by their introduction, Missouri added them to its prohibited species list.[20]

百度百科
龙纹虾
龙纹虾是美国产的，而非澳洲淡水龙虾，蓝龙纹是龙纹虾中的一种身体颜色呈现蓝色的一种。由于是孤雌单性繁殖，变异的机会较大，可能还会出现一些其他的颜色。
中文学名龙纹虾
拉丁学名Procambarus sp.
界动物界
门 节肢动物门
目录
1详细内容
2蓝龙纹虾繁殖经验? 繁殖介绍 ? 繁殖经验
3龙纹虾的资料
1详细内容
自己看看就知道了其差别。

其中的sp.=species 当采集者未对该种(或新种)有更正确鉴定时, 多会以sp.来命名, 这种情形可常见於野生短鲷及异型鱼种, 待尔後经公告确认後才会再以确定种名来标识(此时种名多是以发现者名字来订定了) 。
有可能出蓝色，白色或者粉红色的花纹很是漂亮！PH值资料上记载是6 - 7.5 pH，总硬度是7-10，根据经验觉得PH值高虾的体色偏蓝，PH低偏绿。虽然都很好看，不过就是萝卜白菜各有所爱了!另外次虾的适应跨度远远高于资料所给,估计外国人写的是最适宜生长繁殖的PH值吧。这虾的不同变异体色,粉红和白我还没有,努力中，早晚会给我出2个这种变异!
此虾一只虽然可以繁殖，不过繁殖周期明显要比多只放在一起的要长！个人分析有2种可能，1是多只放一起交配来的比较直接！2是可能周围种群对母虾有个刺激作用，不用接触就能产生一定生理反应。

2蓝龙纹虾繁殖经验
繁殖介绍
虾为孤雌生殖，通俗的说就是不分公母，可以交配生殖，一只也可以生殖。这是乐趣之一，还有一点就是此虾后代变异几率很高，有可能出白色或者粉红色的花纹很是漂亮！温度范围是15-30度，成体能达到12CM左右，虾在3CM左右就有繁殖可能，不过这时候产量很少，而且成活率低，一般在5CM以上繁殖才好！25度水温出虾要30天。PH值资料上记载是6 - 7.5 pH，总硬度是7-10，PH值高虾的体色偏蓝，PH低偏绿。次虾的适应跨度远远高于资料所给,外国人写的是最适宜生长繁殖的PH值!这虾真正好的是在成体后,颜色稳定,而且花纹的美丽才能真正表现出来。

繁殖经验
（1）抱卵前兆：蓝龙纹虾有时候到达3CM以上就可能开始抱卵，抱卵之前，据我观察，种虾都用最后的几个腿梳理腹部泳足（学名不知道如何称呼，在此我就称之为绒毛了），这就是其前兆。可能大家都知道，有时候发现樱花也是如此。蓝龙纹出现这种动作时， 表示很快要抱卵了。
（2）抱卵期间：进食少，喜安静（建议大家给它们躲藏的地方），水流不宜大，此段时间需氧量稍高，有条件打点氧有利于抱住卵和孵化。如果有条件，在气温较低的时候用个加热棒，温度个人感觉25度左右即可，孵化时间和温度有关系。温度过低，孵化时间长，成活率也低。一般时间在30天左右（只是个人初步估计，没有详细记录时间），在天气冷的时候，我有时没用加热棒，曾经出现过40天左右才孵化出来的情况。换水尽量勤换少换，避免较大的改变水的PH值等。
（3）孵化之后：多放置些珊瑚砂和磁环等小虾宜躲藏的地方，经我的观察，小虾基本在一周左右可以全部下身，此时可以把种虾分开了，不然它会吃小虾的。在小虾饲养过程中，勤换水少换，避开蜕皮期间换水，尽量避免引起PH值等震荡，蜕皮期间少喂。小虾的食物可以为孵化的丰年虾、冰冻红虫、线蛇等均可，由于是杂食性的虾，其它食物也可，前面所说的只是我个人的喂食情况。
（4）蓝龙纹虾是单性繁殖：但是同时养2只以上，让它们能够互相看着对方，能够提高抱卵几率，但最好分隔开，只要能看到对方即可。
3龙纹虾的资料
Name: Procambarus sp.
龙纹虾Familly Cambariidae
Origin:
America
Recent Distribution: -
Commercial Name: Marble Crayfish, Speckled Crayfish.
Size: up to 10 cm
Adequate Environment: 100 litres aquarium, neutral pH
Temperature: 18 to 26°C
Feeding: Omnivorous, provide also some vegetal food in order to avoid plant mollesting
Utility:Very decorative
Particularities: to date no male has been observed,
but eggs still appear and develop. The sole explanation would be its
capacity to reproduce parthenogenetically.』
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