A conference at the Białowieża National Park near Poland’s border with Belarus looked at threats to these vulnerable animals.
The conference was the last in a series of events to mark the anniversary.
On September 19, 1929, two European bison were brought to Białowieża from Germany and Denmark.
Ninety years on, 517 bison roam free in the Białowieża Park.
There are also some 1,300 bison in the Borecka, Augustowska and Knyszyńska Forests in northern Poland.
The total number of European bison worldwide is estimated at 6,500.
Wojciech Hurkała of Poland’s Environment Ministry has told state news agency PAP that no effort should be spared to preserve the species, which he said is extremely susceptible to diseases and various environmental threats.
He added that it is necessary to disperse the bison population by introducing a new herd in the southern part of Poland’s eastern Lublin province.
The Białowieża Forest is the last preserved part of the primeval forest that once covered Europe. It is listed as a UNESCO World Heritage site.
(mk/gs)