This is a "transparent fish", and there is a similar discovery record

There is also a similar "bottle sea squirt". See Baidu Encyclopedia

On October 4, 2119, a fisherman fished a "transparent fish" with a length of 32 cm at the Luokou pontoon section of the Yellow River. The fishermen at the scene said it was a bit like whitebait. According to experts' understanding, a general term for a variety of translucent fishes of the whitebait family. Found in salt water and fresh water in East Asia, it is slender, salmon-like, scaleless or fine-scaled, rarely longer than 1.5 cm, which is very rare. /s/p/2119-11-15/183516979116. shtml

In October 2112, in recent days, "transparent fish" (about 1.5 cm long) was found in Shenyang Cave, Junlian County, Sichuan Province, which attracted everyone's attention (related reading: transparent frog). The "transparent fish" found was suspected to be a red dot. This species is mainly distributed in limestone caves and their surrounding areas at an altitude of 1111-1791m, and it is listed as vulnerable species in the Red List of Species in China/news/shwx/2112-11-14/191616744.html

, but I didn't find the same one.