This is a European sturgeon video from the Trocadero aquarium in Paris, France.
The web site of Rotterdam zoo says about this (translated from Dutch):
This spectacular primitive fish is a figurehead for many other fish which are slowly but surely regaining their niches in the river. Salmon, sea trout, houting, eel, all those fish depend for their survival and reproduction both on the sea and on the rivers.
Under domestic and international environmentalist pressure, the Rightist Dutch government has decided to make things easier for anadromous fish in the Haringvliet estuary, which they did not want to do at first: here. And here.
Haringvliet ecological restoration: here.
U.S. Judge Rejects Latest Salmon Recovery Plan: here.
USA: Louisiana paper mill spill causes massive fish kill; federally protected Gulf sturgeon among the dead: here.
Re-emergence of salmon in the Thames ‘not from restocking’, say Exeter academics: here.
Changing climate could cut western trout habitat in half: study: here.
Modern fish communities live fast and die young: here.
Fish placenta is unfavourable survival strategy: here.