I cannot say that, but I guess it is one of the first constructions. Călăraşi Zoo was opened in 1980. The zoo went through a difficult time in the winter of 1985 when the garden was flooded and 80% of the animals drowned. The recovered animals were housed at various locations around the city. After 3 years the park was reopened. In the 1990s, the funds provided from the town hall budget only covered the keeping of animals. There was no money for renovation or modernization investments. For 4 years, the zoo survived on 25,000 lei, in comparison, the Bucharest zoo received over 10 million lei. To survive this period, tiger cubs became barter currency for other special animals. Between 1990 and 2000, the Calarasi Zoo reproduced Siberian tigers and jaguars, obtaining over 60 specimens that reached other zoos in Romania, including the Bucharest Zoo or the "Globe Circus".
If you're interested I can give some information about all zoos at the Romanian thread with linking the pics. But I still need some time to sort and rename the pics.