I was the bare owner of a house, the usufructuary has just passed away. Does my notary have to take steps with the land registration service?

No. In the case mentioned, there is no legal obligation to advertise with the land advertisement service.
The death of the usufructuary will simply be mentioned in the next deed of disposal subject to publication relating to this house (example: a sale), by the former bare owner who has become full owner (art. 35, 1° of decree 55- 1350 of October 14, 1955).