Caviar and virgin sturgeons

I posted a funny poem about Putin in N & P (it is political) but I've just remembered another poem that I read when I was young in one of those Doctor books. Probably Dr at Sea. It's vaguely related to Russia because of the subject.

Caviar comes from the virgin sturgeon
Virgin sturgeon's a very rare fish
Virgin sturgeon needs no urgin'
That's why caviar's a very rare dish.

Anyone else remember the films? B Bardot was in one I recall and a very handsome Dirk Bogard.