Red-backed paradise fish (Macropodus erythropterus) in Cologne Zoo Aquarium | Photo: zoos.media 1. December 202030. November 2020 history, media-echo « back 50th Anniversary of the Cologne Zoo Aquarium Published on the Facebook page of Citizen Conservation the 19.11.2020. 2021 the Cologne Zoo Aquarium will be celebrating its 50th anniversary – for this occasion, the article takes a look at the past, but also the future of the aquarium. » to the post & article Share this post