龙纹虾,单性繁殖的神秘小龙虾,原产地为来路不明的水族玩家

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所属分类:鲷鱼杂谈

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龙纹短鲷吃什么,都记不清这虾是怎么来的了。

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维基百科原文

Marmorkrebs

From Wikipedia, the free encyclopedia

(Redirected from Marble Crayfish)

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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

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龙纹短鲷吃什么,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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