This is the very last one in Duisburg and he is already quite old. There is in Venezuela a aquarium with this animals(Valencia).
A shallow bank, like in the wild? I heard that when they were kept in 'traditional' dolphins pools (bathtubs, as some people called them) the dolphins often slowly died of sleep deprivation, as they don't sleep in the same way that marine dolphins do
Thankyou for the info! Hopefully Duisburg will be able to source replacements for this magnificent beast when he passes, even though it seems unlikely.