Early testing suggests natural causes are playing, namely cold waters stress, a conditional cause by water temperatures rapidly dropping below the species' tolerant level.

早期检测显示水温骤降导致石斑鱼的死亡，也就是说，海水水温下降过快，低于物种所能承受的温度，导致死亡。

youdao

The Chinese gobioid fishes may be grouped in three types, viz. , the warm-water, the warm-temperate and the cold-temperate species, the type of cold-water species being absent.

中国（鱼叚）虎鱼类可分为暖水性、暖温性和冷温性三个类型，缺乏冷水性种。

youdao

Thus far, they have discovered new species, such as worm-like beings called polychaetes, and new cold-water coral reefs.

BBC: Mapping new worlds