Normally when we share exciting fish from RVS Fishworld we’re content to feature one specimen at a time but this week we have four unique specimens to tell you about. Three of these are fish we have featured before but the hybrid powder brown tang is a new one for us.
你会原谅不是knowing that there are actually two species of ‘powder brown surgeonfish,Acanthurus japonicus和A. nigricans。Acanthurus japonicusis generally considered to be the real powder brown tang with a lighter body color overall, a larger patch of white in the face, and noticeable red markings in the dorsal fins.
较暗的物种Acanthurus nigricans被称为Goldrim Tang，整体上更暗，身体上的黄色轮廓非常明显。很难区分这两个姐妹物种时，它们很小，但是RVS刚与我们共享的混合体是其父母的不寻常融合，并且对真正的Speculy Speculyfish Aficionados具有微妙但非常明显的外观。
The hybrid triggerfish is one we’ve seen before and it features a very recognizable pattern of a reduced spot of theRhinecanthus verrucosus和two small stripes across the tail that are more reminiscent of the common Picasso triggerfish,Rhinecanthus aculeatus。我们看不到这些混合动力的毕加索触发鱼类，但是它们通常在出现时通常很小，因此我们仍在等待看到其中一种混合动力鱼类。
The blue porcupine pufferfish is also a species we’ve encountered in the past and its elongated shape is due to its more pelagic, open water swimming lifestyle as its common name of Pelagic pufferfish describes. These are purely for the fish-only aquarium as they grow large, need to eat a lot of food to maintain their rotund figure which will max out at around at around one foot long.
Of these four awesome fish the real prize is the newest specimen of a golden xanthic undulated triggerfish. As with xanthic specimens ofBalistapus undulatus我们之前已经记录的，这个标本具有与这些非常醒目的鱼类相同的斑点图案。
The consistently spotted pattern of xanthic undulated triggerfish means there has to be some genetic component to their xanthic coloration but unfortunately once in captivity these fish develop the dark green base coloration of normal specimens. We have to wonder if there’s a way to preserves their brilliant golden coloration when they are freshly collected, perhaps by refraining from exposing them to bright lights and any hint of ultraviolet spectrum.
