A remote controlled vehicle filmed ruby seadragon swimming and feeding.

一辆遥控车拍摄了红宝石海龙的游泳和进食过程。

Before 2015, scientists believe only two specifies of seadragon existed.

2015 年之前，科学家认为只有两种海龙。

This one, the ruby seadragon is only identified in 2015 and this is the first ever video of live ruby seadragons.

这只红宝石海龙在 2015 年才被发现，这是有史以来第一个活的红宝石海龙视频。

A seadragon is a type of fish and researchers think this one might use its long tail to grab on to rocks so it`s not carried away by strong currents.

海龙是一种鱼，研究人员认为这种鱼可能会用它的长尾巴抓住岩石，这样它就不会被强流冲走。