This is the world's largest freshwater fish ever documented.

这是有记录以来，世界上最大的淡水鱼。

The 300kg stingray was caught in Cambodia's Mekong river.

这条重达300公斤的黄貂鱼是在柬埔寨的湄公河中被捕获的。

The previous record-holder was a Mekong giant catfish weighing 293kg, caught in Thailand in 2005.

此前的纪录保持者是一条重达293公斤的湄公河巨型鲶鱼，这条鱼是2005年在泰国被捕获的。

There is no official database for such a find.

目前没有记录世界上最大淡水鱼的官方数据库。

But scientists are excited by the discovery, saying it offers hope at a time when overfishing, dams and pollution are a threat.

但科学家们对这次湄公河中发现的巨大黄貂鱼兴奋不已，他们表示，当下，过度捕捞、筑坝和污染对河流生态环境构成了威胁，这个发现带来了希望。

The stingray was fitted with an acoustic tag to track its future movements.

科学家在黄貂鱼身上安装了一个声学标签，跟踪它未来的活动。

It was then released back into the river.

这条黄貂鱼之后被放归河里。