Sturgeon species in Chinese courtyard pond, Pairi Daiza, 2022-09-15

Probably European sea sturgeon, judging by the short and pointy nose

@Mr Gharial To me the bony plates on this fish look smaller than those seen in the majority of images of Acipenser sturio.

During my 2016 visit the sturgeon present in this very same pond was Acipenser ruthenus (sterlet)

@Kakapo

I noticed that when looking up other sturgeon pictures in PD, but the sturgeon shown in the photo certainly isn't a sterlet, as they're flatter and with a longer, thinner snout

@Mr Gharial @Kakapo I am pretty sure there are one or more sterlets in the pond, but this was a substantially bigger sturgeon with a different head.

I also asked in an identification group on FB and they seem to think either Russian sturgeon (Acipenser gueldenstaedtii) or Japanese sturgeon (Acipenser schrenckii).

Unfortunately I would probably need much clearer pictures to have certainty, but the pond doesn't make that easy.