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Melanotaenia boesemani


Melanotaenia boesemani
Boesemani Rainbow
石美人
Boeseman's rainbowfish (Melanotaenia boesemani) is a species of fish in the Melanotaeniidae family. It is also known as Boesemani rainbowfish. It is endemic to Ayamaru River in a mountainous region of the Vogelkop Peninsula, West Papua.
It is also available in the aquarium hobby, where it is prized for its excellent colors and peaceful demeanor. The colour pattern is completely different to most other forms of rainbowfish as it has a half orange-red rear and a blueish-grey or purple front which in some specimens is almost defined perfectly as though the fish has been dipped in paint from both ends. Melantotaenia boesemani will often grow to lengths that exceed 12 centimetres if given the right food and water conditions.

石美人外观上最让人印象深刻的当属其前後两段式不同的体色表现,而这种表现会随著鱼隻的成熟度增加而更為明显。其头部与身体的前半部体色以蓝灰色至橄榄绿為主,搭配鳞片上闪砾的深蓝色金属光泽;身体的後半部与後背鳍、臀鳍与尾鳍的顏色则為鲜艷的橘红或橘黄色,偶爾转身时的角度又闪耀著略带黄绿色的金属光泽;而在这两个区域的交会处,若隐若现地会出现一至三条深溕淮淼臋M纹。随著鱼隻的成熟度,头部与身体前半部的顏色会转变成带有蓝色的深灰色,後半部会变成更為饱和的鲜橘红色。

石美人的饲养十分容易。对于环境的适应力、对各种生餌与人工饲料的接受度、对疾病的耐受力,使得饲养十分容易上手。彩虹鱼天生的活泼好动个性,不仅有敏捷的速度,活动量大,因此饲养这类中型彩虹鱼时的空间避免过小。一般而言,两尺以上的水族箱始足以提供其嬉戏追逐与顺利成长的空间。不过,也因為彩虹鱼好动且动作敏捷的特性,不适合与游泳能力较差或是动作较慢、个性较为害羞、易受惊吓的其他鱼种混养。而屬於中上层水域活动的彩虹鱼最佳的混养伙伴还是彩虹鱼,頂多再加上其他特性相仿、体型大小也相似的鱼种,例如非洲灯刚果灯Pogrammus interruptus等。

石美人的雄雌鱼体色均相似,两者在外观上的差异主要还是在于一些细微的重点。其中,雄鱼有较高的体高、且背鳍末稍有延伸,体色相对地较為亮眼;雌鱼体高则较低,背鳍末端没有延伸而使得鳍形较為圆润。繁殖时,雌鱼一次可产下100至200颗的卵。黏附在水生植物的鱼卵,在水温24~28℃左右约6~7天即可孵化。
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